The following Structured Product Label (SPL) was submitted to the FDA by Glenmark Pharmaceuticals Inc., Usa for the product Lamotrigine (NDC 68462-229). This document serves as the official prescribing information, containing essential scientific data and clinical materials required for healthcare providers and patients.
This specific version of the label includes detailed information regarding adjunctive therapy, monotherapy, 1.2 bipolar disorder, 2.1 general dosing considerations, patients with hepatic impairment, patients with renal impairment, discontinuation strategy, 2.2 epilepsy-adjunctive therapy, and other regulatory disclosures. Use the navigation below to review specific sections of the FDA submission.
Lamotrigine tablets (chewable, dispersible) are indicated as adjunctive therapy for the following seizure types in patients aged 2 years and older:
Lamotrigine tablets (chewable, dispersible) are indicated for conversion to monotherapy in adults (aged 16 years and older) with partial-onset seizures who are receiving treatment with carbamazepine, phenytoin, phenobarbital, primidone, or valproate as the single antiepileptic drug (AED).
Safety and effectiveness of lamotrigine have not been established (1) as initial monotherapy; (2) for conversion to monotherapy from AEDs other than carbamazepine, phenytoin, phenobarbital, primidone, or valproate; or (3) for simultaneous conversion to monotherapy from 2 or more concomitant AEDs.
Lamotrigine tablets (chewable, dispersible) are indicated for the maintenance treatment of bipolar I disorder to delay the time to occurrence of mood episodes (depression, mania, hypomania, mixed episodes) in patients treated for acute mood episodes with standard therapy [see Clinical Studies (14.1)].
Limitations of Use
Treatment of acute manic or mixed episodes is not recommended. Effectiveness of lamotrigine in the acute treatment of mood episodes has not been established.
Rash
There are suggestions, yet to be proven, that the risk of severe, potentially life-threatening rash may be increased by (1) coadministration of lamotrigine with valproate, (2) exceeding the recommended initial dose of lamotrigine, or (3) exceeding the recommended dose escalation for lamotrigine. However, cases have occurred in the absence of these factors [see Boxed Warning]. Therefore, it is important that the dosing recommendations be followed closely.
The risk of nonserious rash may be increased when the recommended initial dose and/or the rate of dose escalation for lamotrigine is exceeded and in patients with a history of allergy or rash to other AEDs.
It is recommended that lamotrigine tablets (chewable, dispersible) not be restarted in patients who discontinued due to rash associated with prior treatment with lamotrigine, unless the potential benefits clearly outweigh the risks. If the decision is made to restart a patient who has discontinued lamotrigine tablets (chewable, dispersible), the need to restart with the initial dosing recommendations should be assessed. The greater the interval of time since the previous dose, the greater consideration should be given to restarting with the initial dosing recommendations. If a patient has discontinued lamotrigine for a period of more than 5 half-lives, it is recommended that initial dosing recommendations and guidelines be followed. The half-life of lamotrigine is affected by other concomitant medications [see Clinical Pharmacology (12.3)].
Lamotrigine Tablets (Chewable, Dispersible) Added to Drugs Known to Induce or Inhibit Glucuronidation
Because lamotrigine is metabolized predominantly by glucuronic acid conjugation, drugs that are known to induce or inhibit glucuronidation may affect the apparent clearance of lamotrigine. Drugs that induce glucuronidation include carbamazepine, phenytoin, phenobarbital, primidone, rifampin, estrogen-containing oral contraceptives, and the protease inhibitors lopinavir/ritonavir and atazanavir/ritonavir. Valproate inhibits glucuronidation. For dosing considerations for lamotrigine tablets (chewable, dispersible) in patients on estrogen-containing contraceptives and atazanavir/ritonavir, see below and Table 13. For dosing considerations for lamotrigine tablets (chewable, dispersible) in patients on other drugs known to induce or inhibit glucuronidation, see Tables 1, 2, 5 to 6, and 13.
Target Plasma Levels for Patients with Epilepsy or Bipolar Disorder
A therapeutic plasma concentration range has not been established for lamotrigine tablets (chewable, dispersible). Dosing of lamotrigine should be based on therapeutic response [see Clinical Pharmacology (12.3)].
Women Taking Estrogen-Containing Oral Contraceptives
Starting Lamotrigine Tablets (Chewable, Dispersible) in Women Taking Estrogen-Containing Oral Contraceptives: Although estrogen-containing oral contraceptives have been shown to increase the clearance of lamotrigine [see Clinical Pharmacology (12.3)], no adjustments to the recommended dose-escalation guidelines for lamotrigine tablets (chewable, dispersible) should be necessary solely based on the use of estrogen-containing oral contraceptives. Therefore, dose escalation should follow the recommended guidelines for initiating adjunctive therapy with lamotrigine tablets (chewable, dispersible) based on the concomitant AED or other concomitant medications (see Tables 1, 5, and 7). See below for adjustments to maintenance doses of lamotrigine tablets (chewable, dispersible) in women taking estrogen-containing oral contraceptives.
Adjustments to the Maintenance Dose of Lamotrigine Tablets (Chewable, Dispersible) in Women Taking Estrogen-Containing Oral Contraceptives
Women and Other Hormonal Contraceptive Preparations or Hormone Replacement Therapy
The effect of other hormonal contraceptive preparations or hormone replacement therapy on the pharmacokinetics of lamotrigine has not been systematically evaluated. It has been reported that ethinylestradiol, not progestogens, increased the clearance of lamotrigine up to 2-fold, and the progestin-only pills had no effect on lamotrigine plasma levels. Therefore, adjustments to the dosage of lamotrigine tablets (chewable, dispersible) in the presence of progestogens alone will likely not be needed.
Patients Taking Atazanavir/Ritonavir
While atazanavir/ritonavir does reduce the lamotrigine plasma concentration, no adjustments to the recommended dose-escalation guidelines for lamotrigine tablets (chewable, dispersible) should be necessary solely based on the use of atazanavir/ritonavir. Dose escalation should follow the recommended guidelines for initiating adjunctive therapy with lamotrigine tablets (chewable, dispersible) based on concomitant AED or other concomitant medications (see Tables 1, 2, and 5). In patients already taking maintenance doses of lamotrigine tablets (chewable, dispersible) and not taking glucuronidation inducers, the dose of lamotrigine tablets (chewable, dispersible) may need to be increased if atazanavir/ritonavir is added, or decreased if atazanavir/ritonavir is discontinued [see Clinical Pharmacology (12.3)].
Experience in patients with hepatic impairment is limited. Based on a clinical pharmacology study in 24 subjects with mild, moderate, and severe liver impairment [see Use in Specific Populations (8.6), Clinical Pharmacology (12.3)], the following general recommendations can be made. No dosage adjustment is needed in patients with mild liver impairment. Initial, escalation, and maintenance doses should generally be reduced by approximately 25% in patients with moderate and severe liver impairment without ascites and 50% in patients with severe liver impairment with ascites. Escalation and maintenance doses may be adjusted according to clinical response.
Initial doses of lamotrigine tablets (chewable, dispersible) should be based on patients’ concomitant medications (see Tables 1 to 3, and 5); reduced maintenance doses may be effective for patients with significant renal impairment [see Use in Specific Populations (8.7), Clinical Pharmacology (12.3)]. Few patients with severe renal impairment have been evaluated during chronic treatment with lamotrigine tablets (chewable, dispersible). Because there is inadequate experience in this population, lamotrigine tablets (chewable, dispersible) should be used with caution in these patients.
Epilepsy: For patients receiving lamotrigine tablets (chewable, dispersible) in combination with other AEDs, a re-evaluation of all AEDs in the regimen should be considered if a change in seizure control or an appearance or worsening of adverse reactions is observed.
If a decision is made to discontinue therapy with lamotrigine tablets (chewable, dispersible), a step-wise reduction of dose over at least 2 weeks (approximately 50% per week) is recommended unless safety concerns require a more rapid withdrawal [see Warnings and Precautions (5.8)].
Discontinuing carbamazepine, phenytoin, phenobarbital, primidone, or other drugs such as rifampin and the protease inhibitors lopinavir/ritonavir and atazanavir/ritonavir that induce lamotrigine glucuronidation should prolong the half-life of lamotrigine; discontinuing valproate should shorten the half-life of lamotrigine.
Bipolar Disorder: In the controlled clinical trials, there was no increase in the incidence, type, or severity of adverse reactions following abrupt termination of lamotrigine tablets (chewable, dispersible). In the clinical development program in adults with bipolar disorder, 2 patients experienced seizures shortly after abrupt withdrawal of lamotrigine tablets (chewable, dispersible). Discontinuation of lamotrigine tablets (chewable, dispersible) should involve a step-wise reduction of dose over at least 2 weeks (approximately 50% per week) unless safety concerns require a more rapid withdrawal [see Warnings and Precautions (5.8)].
This section provides specific dosing recommendations for patients older than 12 years and patients aged 2 to 12 years. Within each of these age-groups, specific dosing recommendations are provided depending upon concomitant AEDs or other concomitant medications (see Table 1 for patients older than 12 years and Table 2 for patients aged 2 to 12 years). A weight-based dosing guide for patients aged 2 to 12 years on concomitant valproate is provided in Table 3.
Recommended dosing guidelines are summarized in Table 1.
In Patients TAKING Valproatea | In Patients NOT TAKING Carbamazepine, Phenytoin, Phenobarbital, Primidone,b or Valproatea | In Patients TAKING Carbamazepine, Phenytoin, Phenobarbital, or Primidoneb and NOT TAKING Valproatea | |
Weeks 1 and 2 | 25 mg every other day | 25 mg every day | 50 mg/day |
Weeks 3 and 4 | 25 mg every day | 50 mg/day | 100 mg/day (in 2 divided doses) |
Week 5 onward to maintenance | Increase by 25 to 50 mg/day every 1 to 2 weeks. | Increase by 50 mg/day every 1 to 2 weeks. | Increase by 100 mg/day every 1 to 2 weeks. |
Usual Maintenance Dose | 100 to 200 mg/day with valproate alone 100 to 400 mg/day with valproate and other drugs that induce glucuronidation (in 1 or 2 divided doses) | 225 to 375 mg/day (in 2 divided doses) | 300 to 500 mg/day (in 2 divided doses) |
Recommended dosing guidelines are summarized in Table 2.
Lower starting doses and slower dose escalations than those used in clinical trials are recommended because of the suggestion that the risk of rash may be decreased by lower starting doses and slower dose escalations. Therefore, maintenance doses will take longer to reach in clinical practice than in clinical trials. It may take several weeks to months to achieve an individualized maintenance dose. Maintenance doses in patients weighing less than 30 kg, regardless of age or concomitant AED, may need to be increased as much as 50%, based on clinical response.
The smallest available strength of lamotrigine tablets (chewable, dispersible) is 2 mg, and only whole tablets should be administered. If the calculated dose cannot be achieved using whole tablets, the dose should be rounded down to the nearest whole tablet [see How Supplied/Storage and Handling (16) and Medication Guide].
In Patients TAKING Valproatea | In Patients NOT TAKING Carbamazepine, Phenytoin, Phenobarbital, Primidone,b or Valproatea | In Patients TAKING Carbamazepine, Phenytoin, Phenobarbital, or Primidoneb and NOT TAKING Valproatea | |
Weeks 1 and 2 | 0.15 mg/kg/day in 1 or 2 divided doses, rounded down to the nearest whole tablet (see Table 3 for weight-based dosing guide) | 0.3 mg/kg/day in 1 or 2 divided doses, rounded down to the nearest whole tablet | 0.6 mg/kg/day in 2 divided doses, rounded down to the nearest whole tablet |
Weeks 3 and 4 | 0.3 mg/kg/day in 1 or 2 divided doses, rounded down to the nearest whole tablet (see Table 3 for weight-based dosing guide) | 0.6 mg/kg/day in 2 divided doses, rounded down to the nearest whole tablet | 1.2 mg/kg/day in 2 divided doses, rounded down to the nearest whole tablet |
Week 5 onward to maintenance | The dose should be increased every 1 to 2 weeks as follows: calculate 0.3 mg/kg/day, round this amount down to the nearest whole tablet, and add this amount to the previously administered daily dose. | The dose should be increased every 1 to 2 weeks as follows: calculate 0.6 mg/kg/day, round this amount down to the nearest whole tablet, and add this amount to the previously administered daily dose. | The dose should be increased every 1 to 2 weeks as follows: calculate 1.2 mg/kg/day, round this amount down to the nearest whole tablet, and add this amount to the previously administered daily dose. |
Usual maintenance dose | 1 to 5 mg/kg/day (maximum 200 mg/day in 1 or 2 divided doses) 1 to 3 mg/kg/day with valproate alone | 4.5 to 7.5 mg/kg/day (maximum 300 mg/day in 2 divided doses) | 5 to 15 mg/kg/day (maximum 400 mg/day in 2 divided doses) |
Maintenance dose in patients less than 30 kg | May need to be increased by as much as 50%, based on clinical response. | May need to be increased by as much as 50%, based on clinical response. | May need to be increased by as much as 50%, based on clinical response. |
Note: Only whole tablets should be used for dosing.
If the patient’s weight is | Give this daily dose, using the most appropriate combination of lamotrigine 2- and 5-mg tablets | ||
Greater than | And less than | Weeks 1 and 2 | Weeks 3 and 4 |
6.7 kg | 14 kg | 2 mg every other day | 2 mg every day |
14.1 kg | 27 kg | 2 mg every day | 4 mg every day |
27.1 kg | 34 kg | 4 mg every day | 8 mg every day |
34.1 kg | 40 kg | 5 mg every day | 10 mg every day |
The usual maintenance doses identified in Tables 1 and 2 are derived from dosing regimens employed in the placebo-controlled adjunctive trials in which the efficacy of lamotrigine tablets (chewable, dispersible) was established. In patients receiving multidrug regimens employing carbamazepine, phenytoin, phenobarbital, or primidone without valproate, maintenance doses of adjunctive lamotrigine tablets (chewable, dispersible) as high as 700 mg/day have been used. In patients receiving valproate alone, maintenance doses of adjunctive lamotrigine tablets (chewable, dispersible) as high as 200 mg/day have been used. The advantage of using doses above those recommended in Tables 1 to 4 has not been established in controlled trials.
The goal of the transition regimen is to attempt to maintain seizure control while mitigating the risk of serious rash associated with the rapid titration of lamotrigine tablets (chewable, dispersible).
The recommended maintenance dose of lamotrigine tablets (chewable, dispersible) as monotherapy is 500 mg/day given in 2 divided doses.
To avoid an increased risk of rash, the recommended initial dose and subsequent dose escalations for lamotrigine tablets (chewable, dispersible) should not be exceeded [see Boxed Warning].
After achieving a dose of 500 mg/day of lamotrigine tablets (chewable, dispersible) using the guidelines in Table 1, the concomitant enzyme-inducing AED should be withdrawn by 20% decrements each week over a 4-week period. The regimen for the withdrawal of the concomitant AED is based on experience gained in the controlled monotherapy clinical trial.
The conversion regimen involves the 4 steps outlined in Table 4.
Lamotrigine Tablets (Chewable, Dispersible) | Valproate | |
Step 1 | Achieve a dose of 200 mg/day according to guidelines in Table 1. | Maintain established stable dose. |
Step 2 | Maintain at 200 mg/day. | Decrease dose by decrements no greater than 500 mg/day/week to 500 mg/day and then maintain for 1 week. |
Step 3 | Increase to 300 mg/day and maintain for 1 week. | Simultaneously decrease to 250 mg/day and maintain for 1 week. |
Step 4 | Increase by 100 mg/day every week to achieve maintenance dose of 500 mg/day. | Discontinue. |
No specific dosing guidelines can be provided for conversion to monotherapy with lamotrigine tablets (chewable, dispersible) with AEDs other than carbamazepine, phenytoin, phenobarbital, primidone, or valproate.
The goal of maintenance treatment with lamotrigine tablets (chewable, dispersible) is to delay the time to occurrence of mood episodes (depression, mania, hypomania, mixed episodes) in patients treated for acute mood episodes with standard therapy [see Indications and Usage (1)].
Patients taking lamotrigine tablets (chewable, dispersible) for more than 16 weeks should be periodically reassessed to determine the need for maintenance treatment.
Adults
The target dose of lamotrigine tablets (chewable, dispersible) is 200 mg/day (100 mg/day in patients taking valproate, which decreases the apparent clearance of lamotrigine, and 400 mg/day in patients not taking valproate and taking either carbamazepine, phenytoin, phenobarbital, primidone, or other drugs such as rifampin and the protease inhibitor lopinavir/ritonavir that increase the apparent clearance of lamotrigine). In the clinical trials, doses up to 400 mg/day as monotherapy were evaluated; however, no additional benefit was seen at 400 mg/day compared with 200 mg/day [see Clinical Studies (14.2)]. Accordingly, doses above 200 mg/day are not recommended.
Treatment with lamotrigine tablets (chewable, dispersible) is introduced, based on concurrent medications, according to the regimen outlined in Table 5. If other psychotropic medications are withdrawn following stabilization, the dose of lamotrigine tablets (chewable, dispersible) should be adjusted. In patients discontinuing valproate, the dose of lamotrigine tablets (chewable, dispersible) should be doubled over a 2-week period in equal weekly increments (see Table 6). In patients discontinuing carbamazepine, phenytoin, phenobarbital, primidone, or other drugs such as rifampin and the protease inhibitors lopinavir/ritonavir and atazanavir/ritonavir that induce lamotrigine glucuronidation, the dose of lamotrigine tablets (chewable, dispersible) should remain constant for the first week and then should be decreased by half over a 2-week period in equal weekly decrements (see Table 6). The dose of lamotrigine tablets (chewable, dispersible) may then be further adjusted to the target dose (200 mg) as clinically indicated.
If other drugs are subsequently introduced, the dose of lamotrigine tablets (chewable, dispersible) may need to be adjusted. In particular, the introduction of valproate requires reduction in the dose of lamotrigine tablets (chewable, dispersible) [see Drug Interactions (7), Clinical Pharmacology (12.3)].
To avoid an increased risk of rash, the recommended initial dose and subsequent dose escalations of lamotrigine tablets (chewable, dispersible) should not be exceeded [see Boxed Warning].
In Patients TAKING Valproatea | In Patients NOT TAKING Carbamazepine, Phenytoin, Phenobarbital, Primidone,b or Valproatea | In Patients TAKING Carbamazepine, Phenytoin, Phenobarbital, or Primidoneb and NOT TAKING Valproatea | |
Weeks 1 and 2 | 25 mg every other day | 25 mg daily | 50 mg daily |
Weeks 3 and 4 | 25 mg daily | 50 mg daily | 100 mg daily, in divided doses |
Week 5 | 50 mg daily | 100 mg daily | 200 mg daily, in divided doses |
Week 6 | 100 mg daily | 200 mg daily | 300 mg daily, in divided doses |
Week 7 | 100 mg daily | 200 mg daily | up to 400 mg daily, in divided doses |
Discontinuation of Psychotropic Drugs (excluding Valproate,a Carbamazepine, Phenytoin, Phenobarbital, or Primidoneb) | After Discontinuation of Valproatea | After Discontinuation of Carbamazepine, Phenytoin, Phenobarbital, or Primidoneb | |
Current Dose of Lamotrigine Tablets (Chewable, Dispersible) (mg/day) 100 | Current Dose of Lamotrigine Tablets (Chewable, Dispersible) (mg/day) 400 | ||
Week 1 | Maintain current dose of lamotrigine tablets (chewable, dispersible) | 150 | 400 |
Week 2 | Maintain current dose of lamotrigine tablets (chewable, dispersible) | 200 | 300 |
Week 3 onward | Maintain current dose of lamotrigine tablets (chewable, dispersible) | 200 | 200 |
Lamotrigine tablets (chewable, dispersible) may be swallowed whole, chewed, or dispersed in water or diluted fruit juice. If the tablets are chewed, consume a small amount of water or diluted fruit juice to aid in swallowing.
To disperse lamotrigine tablets (chewable, dispersible), add the tablets to a small amount of liquid (1 teaspoon, or enough to cover the medication). Approximately 1 minute later, when the tablets are completely dispersed, swirl the solution and consume the entire quantity immediately. No attempt should be made to administer partial quantities of the dispersed tablets.
5 mg: White to off-white, caplet, flat faced, beveled edged, uncoated tablets with score-line on one side and ‘228’ debossed on the other side.
25 mg: White to off-white, circular, flat faced, beveled edged, uncoated tablets with ‘G’ debossed on one side and ‘229’ debossed on the other side.
Pediatric Population
The incidence of serious rash associated with hospitalization and discontinuation of lamotrigine in a prospectively followed cohort of pediatric patients (aged 2 to 17 years) is approximately 0.3% to 0.8%. One rash-related death was reported in a prospectively followed cohort of 1,983 pediatric patients (aged 2 to 16 years) with epilepsy taking lamotrigine as adjunctive therapy. Additionally, there have been rare cases of toxic epidermal necrolysis with and without permanent sequelae and/or death in US and foreign postmarketing experience.
There is evidence that the inclusion of valproate in a multidrug regimen increases the risk of serious, potentially life-threatening rash in pediatric patients. In pediatric patients who used valproate concomitantly for epilepsy, 1.2% (6 of 482) experienced a serious rash compared with 0.6% (6 of 952) patients not taking valproate.
Adult Population
Serious rash associated with hospitalization and discontinuation of lamotrigine occurred in 0.3% (11 of 3,348) of adult patients who received lamotrigine in premarketing clinical trials of epilepsy. In the bipolar and other mood disorders clinical trials, the rate of serious rash was 0.08% (1 of 1,233) of adult patients who received lamotrigine as initial monotherapy and 0.13% (2 of 1,538) of adult patients who received lamotrigine as adjunctive therapy. No fatalities occurred among these individuals. However, in worldwide postmarketing experience, rare cases of rash-related death have been reported, but their numbers are too few to permit a precise estimate of the rate.
Among the rashes leading to hospitalization were Stevens-Johnson syndrome, toxic epidermal necrolysis, angioedema, and those associated with multiorgan hypersensitivity [see Warnings and Precautions (5.2)].
There is evidence that the inclusion of valproate in a multidrug regimen increases the risk of serious, potentially life-threatening rash in adults. Specifically, of 584 patients administered lamotrigine with valproate in epilepsy clinical trials, 6 (1%) were hospitalized in association with rash; in contrast, 4 (0.16%) of 2,398 clinical trial patients and volunteers administered lamotrigine in the absence of valproate were hospitalized.
Patients with History of Allergy or Rash to Other Antiepileptic Drugs
The risk of nonserious rash may be increased when the recommended initial dose and/or the rate of dose escalation for lamotrigine is exceeded and in patients with a history of allergy or rash to other AEDs.
Multiorgan hypersensitivity reactions, also known as drug reaction with eosinophilia and systemic symptoms (DRESS), have occurred with lamotrigine. Some have been fatal or life threatening. DRESS typically, although not exclusively, presents with fever, rash, and/or lymphadenopathy in association with other organ system involvement, such as hepatitis, nephritis, hematologic abnormalities, myocarditis, or myositis, sometimes resembling an acute viral infection. Eosinophilia is often present. This disorder is variable in its expression, and other organ systems not noted here may be involved.
Fatalities associated with acute multiorgan failure and various degrees of hepatic failure have been reported in 2 of 3,796 adult patients and 4 of 2,435 pediatric patients who received lamotrigine in epilepsy clinical trials. Rare fatalities from multiorgan failure have also been reported in postmarketing use.
Isolated liver failure without rash or involvement of other organs has also been reported with lamotrigine.
Multiorgan hypersensitivity reactions, also known as drug reaction with eosinophilia and systemic symptoms (DRESS), have occurred with lamotrigine. Some have been fatal or life threatening. DRESS typically, although not exclusively, presents with fever, rash, and/or lymphadenopathy in association with other organ system involvement, such as hepatitis, nephritis, hematologic abnormalities, myocarditis, or myositis, sometimes resembling an acute viral infection. Eosinophilia is often present. This disorder is variable in its expression, and other organ systems not noted here may be involved. Fatalities associated with acute multiorgan failure and various degrees of hepatic failure have been reported in 2 of 3,796 adult patients and 4 of 2,435 pediatric patients who received lamotrigine in epilepsy clinical trials. Rare fatalities from multiorgan failure have also been reported in postmarketing use. Isolated liver failure without rash or involvement of other organs has also been reported with lamotrigine. It is important to note that early manifestations of hypersensitivity (e.g., fever, lymphadenopathy) may be present even though a rash is not evident. If such signs or symptoms are present, the patient should be evaluated immediately. Lamotrigine should be discontinued if an alternative etiology for the signs or symptoms cannot be established.
Prior to initiation of treatment with lamotrigine, the patient should be instructed that a rash or other signs or symptoms of hypersensitivity (e.g., fever, lymphadenopathy) may herald a serious medical event and that the patient should report any such occurrence to a healthcare provider immediately.
There have been reports of blood dyscrasias that may or may not be associated with multiorgan hypersensitivity (also known as DRESS) [see Warnings and Precautions (5.2)]. These have included neutropenia, leukopenia, anemia, thrombocytopenia, pancytopenia, and, rarely, aplastic anemia and pure red cell aplasia.
AEDs, including lamotrigine, increase the risk of suicidal thoughts or behavior in patients taking these drugs for any indication. Patients treated with any AED for any indication should be monitored for the emergence or worsening of depression, suicidal thoughts or behavior, and/or any unusual changes in mood or behavior.
Pooled analyses of 199 placebo-controlled clinical trials (monotherapy and adjunctive therapy) of 11 different AEDs showed that patients randomized to 1 of the AEDs had approximately twice the risk (adjusted Relative Risk 1.8, 95% CI: 1.2, 2.7) of suicidal thinking or behavior compared with patients randomized to placebo. In these trials, which had a median treatment duration of 12 weeks, the estimated incidence of suicidal behavior or ideation among 27,863 AED-treated patients was 0.43%, compared with 0.24% among 16,029 placebo-treated patients, representing an increase of approximately 1 case of suicidal thinking or behavior for every 530 patients treated. There were 4 suicides in drug-treated patients in the trials and none in placebo-treated patients, but the number of events is too small to allow any conclusion about drug effect on suicide.
The increased risk of suicidal thoughts or behavior with AEDs was observed as early as 1 week after starting treatment with AEDs and persisted for the duration of treatment assessed. Because most trials included in the analysis did not extend beyond 24 weeks, the risk of suicidal thoughts or behavior beyond 24 weeks could not be assessed.
The risk of suicidal thoughts or behavior was generally consistent among drugs in the data analyzed. The finding of increased risk with AEDs of varying mechanism of action and across a range of indications suggests that the risk applies to all AEDs used for any indication. The risk did not vary substantially by age (5 to 100 years) in the clinical trials analyzed.
Table 7 shows absolute and relative risk by indication for all evaluated AEDs.
Indication | Placebo Patients with Events per 1,000 Patients | Drug Patients with Events per 1,000 Patients | Relative Risk: Incidence of Events in Drug Patients/Incidence in Placebo Patients | Risk Difference: Additional Drug Patients with Events per 1,000 Patients |
Epilepsy | 1 | 3.4 | 3.5 | 2.4 |
Psychiatric | 5.7 | 8.5 | 1.5 | 2.9 |
Other | 1 | 1.8 | 1.9 | 0.9 |
Total | 2.4 | 4.3 | 1.8 | 1.9 |
The relative risk for suicidal thoughts or behavior was higher in clinical trials for epilepsy than in clinical trials for psychiatric or other conditions, but the absolute risk differences were similar for the epilepsy and psychiatric indications.
Anyone considering prescribing lamotrigine or any other AED must balance the risk of suicidal thoughts or behavior with the risk of untreated illness. Epilepsy and many other illnesses for which AEDs are prescribed are themselves associated with morbidity and mortality and an increased risk of suicidal thoughts and behavior. Should suicidal thoughts and behavior emerge during treatment, the prescriber needs to consider whether the emergence of these symptoms in any given patient may be related to the illness being treated.
Patients, their caregivers, and families should be informed that AEDs increase the risk of suicidal thoughts and behavior and should be advised of the need to be alert for the emergence or worsening of the signs and symptoms of depression, any unusual changes in mood or behavior, or the emergence of suicidal thoughts or suicidal behavior, or thoughts about self-harm. Behaviors of concern should be reported immediately to healthcare providers.
Therapy with lamotrigine increases the risk of developing aseptic meningitis. Because of the potential for serious outcomes of untreated meningitis due to other causes, patients should also be evaluated for other causes of meningitis and treated as appropriate.
Postmarketing cases of aseptic meningitis have been reported in pediatric and adult patients taking lamotrigine for various indications. Symptoms upon presentation have included headache, fever, nausea, vomiting, and nuchal rigidity. Rash, photophobia, myalgia, chills, altered consciousness, and somnolence were also noted in some cases. Symptoms have been reported to occur within 1 day to one and a half months following the initiation of treatment. In most cases, symptoms were reported to resolve after discontinuation of lamotrigine. Re-exposure resulted in a rapid return of symptoms (from within 30 minutes to 1 day following re-initiation of treatment) that were frequently more severe. Some of the patients treated with lamotrigine who developed aseptic meningitis had underlying diagnoses of systemic lupus erythematosus or other autoimmune diseases.
Cerebrospinal fluid (CSF) analyzed at the time of clinical presentation in reported cases was characterized by a mild to moderate pleocytosis, normal glucose levels, and mild to moderate increase in protein. CSF white blood cell count differentials showed a predominance of neutrophils in a majority of the cases, although a predominance of lymphocytes was reported in approximately one third of the cases. Some patients also had new onset of signs and symptoms of involvement of other organs (predominantly hepatic and renal involvement), which may suggest that in these cases the aseptic meningitis observed was part of a hypersensitivity reaction [see Warnings and Precautions (5.2)].
Medication errors involving lamotrigine have occurred. In particular, the name lamotrigine can be confused with the names of other commonly used medications. Medication errors may also occur between the different formulations of lamotrigine. To reduce the potential of medication errors, write and say lamotrigine clearly. Depictions of the lamotrigine tablets (chewable, dispersible) can be found in the Medication Guide that accompanies the product to highlight the distinctive markings, colors, and shapes that serve to identify the different presentations of the drug and thus may help reduce the risk of medication errors. To avoid the medication error of using the wrong drug or formulation, patients should be strongly advised to visually inspect their tablets to verify that they are lamotrigine tablets (chewable, dispersible), as well as the correct formulation of lamotrigine, each time they fill their prescription.
Some estrogen-containing oral contraceptives have been shown to decrease serum concentrations of lamotrigine [see Clinical Pharmacology (12.3)]. Dosage adjustments will be necessary in most patients who start or stop estrogen-containing oral contraceptives while taking lamotrigine[see Dosage and Administration (2.1)]. During the week of inactive hormone preparation (pill-free week) of oral contraceptive therapy, plasma lamotrigine levels are expected to rise, as much as doubling at the end of the week. Adverse reactions consistent with elevated levels of lamotrigine, such as dizziness, ataxia, and diplopia, could occur.
As with other AEDs, lamotrigine should not be abruptly discontinued. In patients with epilepsy there is a possibility of increasing seizure frequency. In clinical trials in adults with bipolar disorder, 2 patients experienced seizures shortly after abrupt withdrawal of lamotrigine. Unless safety concerns require a more rapid withdrawal, the dose of lamotrigine should be tapered over a period of at least 2 weeks (approximately 50% reduction per week) [see Dosage and Administration (2.1)].
Valid estimates of the incidence of treatment-emergent status epilepticus among patients treated with lamotrigine are difficult to obtain because reporters participating in clinical trials did not all employ identical rules for identifying cases. At a minimum, 7 of 2,343 adult patients had episodes that could unequivocally be described as status epilepticus. In addition, a number of reports of variably defined episodes of seizure exacerbation (e.g., seizure clusters, seizure flurries) were made.
During the premarketing development of lamotrigine, 20 sudden and unexplained deaths were recorded among a cohort of 4,700 patients with epilepsy (5,747 patient-years of exposure).
Some of these could represent seizure-related deaths in which the seizure was not observed, e.g., at night. This represents an incidence of 0.0035 deaths per patient-year. Although this rate exceeds that expected in a healthy population matched for age and sex, it is within the range of estimates for the incidence of sudden unexplained death in epilepsy (SUDEP) in patients not receiving lamotrigine (ranging from 0.0005 for the general population of patients with epilepsy, to 0.004 for a recently studied clinical trial population similar to that in the clinical development program for lamotrigine, to 0.005 for patients with refractory epilepsy). Consequently, whether these figures are reassuring or suggest concern depends on the comparability of the populations reported upon with the cohort receiving lamotrigine and the accuracy of the estimates provided. Probably most reassuring is the similarity of estimated SUDEP rates in patients receiving lamotrigine and those receiving other AEDs, chemically unrelated to each other, that underwent clinical testing in similar populations. Importantly, that drug is chemically unrelated to lamotrigine. This evidence suggests, although it certainly does not prove, that the high SUDEP rates reflect population rates, not a drug effect.
Because lamotrigine binds to melanin, it could accumulate in melanin-rich tissues over time. This raises the possibility that lamotrigine may cause toxicity in these tissues after extended use. Although ophthalmological testing was performed in 1 controlled clinical trial, the testing was inadequate to exclude subtle effects or injury occurring after long-term exposure. Moreover, the capacity of available tests to detect potentially adverse consequences, if any, of lamotrigine's binding to melanin is unknown [see Clinical Pharmacology (12.2)].
Accordingly, although there are no specific recommendations for periodic ophthalmological monitoring, prescribers should be aware of the possibility of long-term ophthalmologic effects.
False-Positive Drug Test Results
Lamotrigine has been reported to interfere with the assay used in some rapid urine drug screens, which can result in false-positive readings, particularly for phencyclidine (PCP). A more specific analytical method should be used to confirm a positive result.
Plasma Concentrations of Lamotrigine
The value of monitoring plasma concentrations of lamotrigine in patients treated with lamotrigine has not been established. Because of the possible pharmacokinetic interactions between lamotrigine and other drugs, including AEDs (see Table 13), monitoring of the plasma levels of lamotrigine and concomitant drugs may be indicated, particularly during dosage adjustments. In general, clinical judgment should be exercised regarding monitoring of plasma levels of lamotrigine and other drugs and whether or not dosage adjustments are necessary.
The following adverse reactions are described in more detail in the Warnings and Precautions section of the label:
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.
Most Common Adverse Reactions in All Clinical Trials: Adjunctive Therapy in Adults with Epilepsy: The most commonly observed (≥5% for lamotrigine and more common on drug than placebo) adverse reactions seen in association with lamotrigine during adjunctive therapy in adults and not seen at an equivalent frequency among placebo-treated patients were: dizziness, ataxia, somnolence, headache, diplopia, blurred vision, nausea, vomiting, and rash. Dizziness, diplopia, ataxia, blurred vision, nausea, and vomiting were dose-related. Dizziness, diplopia, ataxia, and blurred vision occurred more commonly in patients receiving carbamazepine with lamotrigine than in patients receiving other AEDs with lamotrigine. Clinical data suggest a higher incidence of rash, including serious rash, in patients receiving concomitant valproate than in patients not receiving valproate [see Warnings and Precautions (5.1)].
Approximately 11% of the 3,378 adult patients who received lamotrigine as adjunctive therapy in premarketing clinical trials discontinued treatment because of an adverse reaction. The adverse reactions most commonly associated with discontinuation were rash (3%), dizziness (2.8%), and headache (2.5%).
In a dose-response trial in adults, the rate of discontinuation of lamotrigine for dizziness, ataxia, diplopia, blurred vision, nausea, and vomiting was dose-related.
Approximately 10% of the 420 adult patients who received lamotrigine as monotherapy in premarketing clinical trials discontinued treatment because of an adverse reaction. The adverse reactions most commonly associated with discontinuation were rash (4.5%), headache (3.1%), and asthenia (2.4%).
In 339 patients aged 2 to 16 years with partial-onset seizures or generalized seizures of Lennox‑Gastaut syndrome, 4.2% of patients on lamotrigine and 2.9% of patients on placebo discontinued due to adverse reactions. The most commonly reported adverse reaction that led to discontinuation of lamotrigine was rash.
Approximately 11.5% of the 1,081 pediatric patients aged 2 to 16 years who received lamotrigine as adjunctive therapy in premarketing clinical trials discontinued treatment because of an adverse reaction. The adverse reactions most commonly associated with discontinuation were rash (4.4%), reaction aggravated (1.7%), and ataxia (0.6%).
Body System/ Adverse Reaction | Percent of Patients Receiving Adjunctive Lamotrigine (n = 711) | Percent of Patients Receiving Adjunctive Placebo (n = 419) |
Body as a whole | ||
Headache | 29 | 19 |
Flu syndrome | 7 | 6 |
Fever | 6 | 4 |
Abdominal pain | 5 | 4 |
Neck pain | 2 | 1 |
Reaction aggravated (seizure exacerbation) | 2 | 1 |
Digestive | ||
Nausea | 19 | 10 |
Vomiting | 9 | 4 |
Diarrhea | 6 | 4 |
Dyspepsia | 5 | 2 |
Constipation | 4 | 3 |
Anorexia | 2 | 1 |
Musculoskeletal | ||
Arthralgia | 2 | 0 |
Nervous | ||
Dizziness | 38 | 13 |
Ataxia | 22 | 6 |
Somnolence | 14 | 7 |
Incoordination | 6 | 2 |
Insomnia | 6 | 2 |
Tremor | 4 | 1 |
Depression | 4 | 3 |
Anxiety | 4 | 3 |
Convulsion | 3 | 1 |
Irritability | 3 | 2 |
Speech disorder | 3 | 0 |
Concentration disturbance | 2 | 1 |
Respiratory | ||
Rhinitis | 14 | 9 |
Pharyngitis | 10 | 9 |
Cough increased | 8 | 6 |
Skin and appendages | ||
Rash | 10 | 5 |
Pruritus | 3 | 2 |
Special senses | ||
Diplopia | 28 | 7 |
Blurred vision | 16 | 5 |
Vision abnormality | 3 | 1 |
Urogenital | ||
Female patients only | (n = 365) | (n = 207) |
Dysmenorrhea | 7 | 6 |
Vaginitis | 4 | 1 |
Amenorrhea | 2 | 1 |
In a randomized, parallel trial comparing placebo with 300 and 500 mg/day of lamotrigine, some of the more common drug-related adverse reactions were dose related (see Table 9).
Adverse Reaction | Percent of Patients Experiencing Adverse Reactions | ||
Placebo (n = 73) | Lamotrigine 300 mg (n = 71) | Lamotrigine 500 mg (n = 72) | |
Ataxia | 10 | 10 | 28a,b |
Blurred vision | 10 | 11 | 25a,b |
Diplopia | 8 | 24a | 49a,b |
Dizziness | 27 | 31 | 54a,b |
Nausea | 11 | 18 | 25a |
Vomiting | 4 | 11 | 18a |
a Significantly greater than placebo group (P<0.05).
b Significantly greater than group receiving lamotrigine 300 mg (P<0.05).
The overall adverse reaction profile for lamotrigine was similar between females and males and was independent of age. Because the largest non-Caucasian racial subgroup was only 6% of patients exposed to lamotrigine in placebo-controlled trials, there are insufficient data to support a statement regarding the distribution of adverse reaction reports by race. Generally, females receiving either lamotrigine as adjunctive therapy or placebo were more likely to report adverse reactions than males. The only adverse reaction for which the reports on lamotrigine were greater than 10% more frequent in females than males (without a corresponding difference by gender on placebo) was dizziness (difference = 16.5%). There was little difference between females and males in the rates of discontinuation of lamotrigine for individual adverse reactions.
Body System/ Adverse Reaction | Percent of Patients Receiving Lamotriginec as Monotherapy (n = 43) | Percent of Patients Receiving Low-Dose Valproated Monotherapy (n = 44) |
Body as a whole | ||
Pain | 5 | 0 |
Infection | 5 | 2 |
Chest pain | 5 | 2 |
Digestive | ||
Vomiting | 9 | 0 |
Dyspepsia | 7 | 2 |
Nausea | 7 | 2 |
Metabolic and nutritional | ||
Weight decrease | 5 | 2 |
Nervous | ||
Coordination abnormality | 7 | 0 |
Dizziness | 7 | 0 |
Anxiety | 5 | 0 |
Insomnia | 5 | 2 |
Respiratory | ||
Rhinitis | 7 | 2 |
Urogenital (female patients only) | (n = 21) | (n = 28) |
Dysmenorrhea | 5 | 0 |
c Up to 500 mg/day.
d 1,000 mg/day.
Adverse reactions that occurred with a frequency of less than 5% and greater than 2% of patients receiving lamotrigine and numerically more frequent than placebo were:
Body as a Whole: Asthenia, fever.
Digestive: Anorexia, dry mouth, rectal hemorrhage, peptic ulcer.
Metabolic and Nutritional: Peripheral edema.
Nervous System: Amnesia, ataxia, depression, hypesthesia, libido increase, decreased reflexes, increased reflexes, nystagmus, irritability, suicidal ideation.
Respiratory: Epistaxis, bronchitis, dyspnea.
Skin and Appendages: Contact dermatitis, dry skin, sweating.
Special Senses: Vision abnormality.
Body System/Adverse Reaction | Percent of Patients Receiving Lamotrigine (n = 168) | Percent of Patients Receiving Placebo (n = 171) |
Body as a whole | ||
Infection | 20 | 17 |
Fever | 15 | 14 |
Accidental injury | 14 | 12 |
Abdominal pain | 10 | 5 |
Asthenia | 8 | 4 |
Flu syndrome | 7 | 6 |
Pain | 5 | 4 |
Facial edema | 2 | 1 |
Photosensitivity | 2 | 0 |
Cardiovascular | ||
Hemorrhage | 2 | 1 |
Digestive | ||
Vomiting | 20 | 16 |
Diarrhea | 11 | 9 |
Nausea | 10 | 2 |
Constipation | 4 | 2 |
Dyspepsia | 2 | 1 |
Hemic and lymphatic | ||
Lymphadenopathy | 2 | 1 |
Metabolic and nutritional | ||
Edema | 2 | 0 |
Nervous system | ||
Somnolence | 17 | 15 |
Dizziness | 14 | 4 |
Ataxia | 11 | 3 |
Tremor | 10 | 1 |
Emotional lability | 4 | 2 |
Gait abnormality | 4 | 2 |
Thinking abnormality | 3 | 2 |
Convulsions | 2 | 1 |
Nervousness | 2 | 1 |
Vertigo | 2 | 1 |
Respiratory | ||
Pharyngitis | 14 | 11 |
Bronchitis | 7 | 5 |
Increased cough | 7 | 6 |
Sinusitis | 2 | 1 |
Bronchospasm | 2 | 1 |
Skin | ||
Rash | 14 | 12 |
Eczema | 2 | 1 |
Pruritus | 2 | 1 |
Special senses | ||
Diplopia | 5 | 1 |
Blurred vision | 4 | 1 |
Visual abnormality | 2 | 0 |
Urogenital | ||
Male and female patients Urinary tract infection | 3 | 0 |
Adverse Reactions following Abrupt Discontinuation: In the 2 controlled clinical trials, there was no increase in the incidence, severity, or type of adverse reactions in patients with bipolar disorder after abruptly terminating therapy with lamotrigine. In the clinical development program in adults with bipolar disorder, 2 patients experienced seizures shortly after abrupt withdrawal of lamotrigine. [see Warnings and Precautions (5.8)].
Mania/Hypomania/Mixed Episodes: During the double-blind placebo-controlled clinical trials in bipolar I disorder in which adults were converted to monotherapy with lamotrigine (100 to 400 mg/day) from other psychotropic medications and followed for up to 18 months, the rates of manic or hypomanic or mixed mood episodes reported as adverse reactions were 5% for patients treated with lamotrigine (n = 227), 4% for patients treated with lithium (n = 166), and 7% for patients treated with placebo (n = 190). In all bipolar controlled trials combined, adverse reactions of mania (including hypomania and mixed mood episodes) were reported in 5% of patients treated with lamotrigine (n = 956), 3% of patients treated with lithium (n = 280), and 4% of patients treated with placebo (n = 803).
Renal Impairment: Twelve volunteers with chronic renal failure (mean creatinine clearance: 13 mL/min, range: 6 to 23) and another 6 individuals undergoing hemodialysis were each given a single 100-mg dose of lamotrigine. The mean plasma half-lives determined in the study were 42.9 hours (chronic renal failure), 13 hours (during hemodialysis), and 57.4 hours (between hemodialysis) compared with 26.2 hours in healthy volunteers. On average, approximately 20% (range: 5.6 to 35.1) of the amount of lamotrigine present in the body was eliminated by hemodialysis during a 4-hour session [see Dosage and Administration (2.1)].
Hepatic Disease: The pharmacokinetics of lamotrigine following a single 100-mg dose of lamotrigine were evaluated in 24 subjects with mild, moderate, and severe hepatic impairment (Child-Pugh classification system) and compared with 12 subjects without hepatic impairment. The subjects with severe hepatic impairment were without ascites (n = 2) or with ascites (n = 5). The mean apparent clearances of lamotrigine in subjects with mild (n = 12), moderate (n = 5), severe without ascites (n = 2), and severe with ascites (n = 5) liver impairment were 0.30 ± 0.09, 0.24 ± 0.1, 0.21 ± 0.04, and 0.15 ± 0.09 mL/min/kg, respectively, as compared with 0.37 ± 0.1 mL/min/kg in the healthy controls. Mean half-lives of lamotrigine in subjects with mild, moderate, severe without ascites, and severe with ascites hepatic impairment were 46 ± 20, 72 ± 44, 67 ± 11, and 100 ± 48 hours, respectively, as compared with 33 ± 7 hours in healthy controls [see Dosage and Administration (2.1)].
Age: Pediatric Subjects: The pharmacokinetics of lamotrigine following a single 2-mg/kg dose were evaluated in 2 studies in pediatric subjects (n = 29 for subjects aged 10 months to 5.9 years and n = 26 for subjects aged 5 to 11 years). Forty-three subjects received concomitant therapy with other AEDs and 12 subjects received lamotrigine as monotherapy. Lamotrigine pharmacokinetic parameters for pediatric patients are summarized in Table 16.
Population pharmacokinetic analyses involving subjects aged 2 to 18 years demonstrated that lamotrigine clearance was influenced predominantly by total body weight and concurrent AED therapy. The oral clearance of lamotrigine was higher, on a body weight basis, in pediatric patients than in adults. Weight-normalized lamotrigine clearance was higher in those subjects weighing less than 30 kg compared with those weighing greater than 30 kg. Accordingly, patients weighing less than 30 kg may need an increase of as much as 50% in maintenance doses, based on clinical response, as compared with subjects weighing more than 30 kg being administered the same AEDs [see Dosage and Administration (2.2)]. These analyses also revealed that, after accounting for body weight, lamotrigine clearance was not significantly influenced by age. Thus, the same weight-adjusted doses should be administered to children irrespective of differences in age. Concomitant AEDs which influence lamotrigine clearance in adults were found to have similar effects in children.
Pediatric Study Population | Number of Subjects | Tmax (h) | t1/2 (h) | CL/F (mL/min/kg) |
Ages 10 months to 5.3 years | ||||
| 10 | 3 (1 to 5.9) | 7.7 (5.7 to 11.4) | 3.62 (2.44 to 5.28) |
| 7 | 5.2 (2.9 to 6.1) | 19 (12.9 to 27.1) | 1.2 (0.75 to 2.42) |
| 8 | 2.9 (1 to 6) | 44.9 (29.5 to 52.5) | 0.47 (0.23 to 0.77) |
Ages 5 to 11 years | ||||
| 7 | 1.6 (1 to 3) | 7 (3.8 to 9.8) | 2.54 (1.35 to 5.58) |
| 8 | 3.3 (1 to 6.4) | 19.1 (7 to 31.2) | 0.89 (0.39 to 1.93) |
| 3 | 4.5 (3 to 6) | 65.8 (50.7 to 73.7) | 0.24 (0.21 to 0.26) |
Ages 13 to 18 years | ||||
| 11 | c | c | 1.3 |
| 8 | c | c | 0.5 |
| 4 | c | c | 0.3 |
b Two subjects were included in the calculation for mean Tmax.
c Parameter not estimated.
Gender: The clearance of lamotrigine is not affected by gender. However, during dose escalation of lamotrigine in 1 clinical trial in patients with epilepsy on a stable dose of valproate (n = 77), mean trough lamotrigine concentrations unadjusted for weight were 24% to 45% higher (0.3 to 1.7 mcg/mL) in females than in males.
Race: The apparent oral clearance of lamotrigine was 25% lower in non-Caucasians than Caucasians.
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November 2017
The most common adverse reactions seen in association with the use of lamotrigine as monotherapy (100 to 400 mg/day) in adult patients (aged 18 to 82 years) with bipolar disorder in the 2 double-blind placebo-controlled trials of 18 months’ duration are included in Table 12. Adverse reactions that occurred in at least 5% of patients and were numerically more frequent during the dose-escalation phase of lamotrigine in these trials (when patients may have been receiving concomitant medications) compared with the monotherapy phase were: headache (25%), rash (11%), dizziness (10%), diarrhea (8%), dream abnormality (6%), and pruritus (6%).
During the monotherapy phase of the double-blind placebo-controlled trials of 18 months’ duration, 13% of 227 patients who received lamotrigine (100 to 400 mg/day), 16% of 190 patients who received placebo, and 23% of 166 patients who received lithium discontinued therapy because of an adverse reaction. The adverse reactions that most commonly led to discontinuation of lamotrigine were rash (3%) and mania/hypomania/mixed mood adverse reactions (2%). Approximately 16% of 2,401 patients who received lamotrigine (50 to 500 mg/day) for bipolar disorder in premarketing trials discontinued therapy because of an adverse reaction, most commonly due to rash (5%) and mania/hypomania/mixed mood adverse reactions (2%).
The overall adverse reaction profile for lamotrigine was similar between females and males, between elderly and nonelderly patients, and among racial groups.
Body System/Adverse Reaction | Percent of Patients Receiving Lamotrigine (n = 227) | Percent of Patients Receiving Placebo (n = 190) |
General | ||
Back pain | 8 | 6 |
Fatigue | 8 | 5 |
Abdominal pain | 6 | 3 |
Digestive | ||
Nausea | 14 | 11 |
Constipation | 5 | 2 |
Vomiting | 5 | 2 |
Nervous System | ||
Insomnia | 10 | 6 |
Somnolence | 9 | 7 |
Xerostomia (dry mouth) | 6 | 4 |
Respiratory | ||
Rhinitis | 7 | 4 |
Exacerbation of cough | 5 | 3 |
Pharyngitis | 5 | 4 |
Skin | ||
Rash (nonserious)c | 7 | 5 |
Other reactions that occurred in 5% or more patients but equally or more frequently in the placebo group included: dizziness, mania, headache, infection, influenza, pain, accidental injury, diarrhea, and dyspepsia.
Adverse reactions that occurred with a frequency of less than 5% and greater than 1% of patients receiving lamotrigine and numerically more frequent than placebo were:
General: Fever, neck pain.
Cardiovascular: Migraine.
Digestive: Flatulence.
Metabolic and Nutritional: Weight gain, edema.
Musculoskeletal: Arthralgia, myalgia.
Nervous System: Amnesia, depression, agitation, emotional lability, dyspraxia, abnormal thoughts, dream abnormality, hypoesthesia.
Respiratory: Sinusitis.
Urogenital: Urinary frequency.
Lamotrigine has been administered to 6,694 individuals for whom complete adverse reaction data was captured during all clinical trials, only some of which were placebo controlled. During these trials, all adverse reactions were recorded by the clinical investigators using terminology of their own choosing. To provide a meaningful estimate of the proportion of individuals having adverse reactions, similar types of adverse reactions were grouped into a smaller number of standardized categories using modified COSTART dictionary terminology. The frequencies presented represent the proportion of the 6,694 individuals exposed to lamotrigine who experienced an event of the type cited on at least 1 occasion while receiving lamotrigine. All reported adverse reactions are included except those already listed in the previous tables or elsewhere in the labeling, those too general to be informative, and those not reasonably associated with the use of the drug.
Adverse reactions are further classified within body system categories and enumerated in order of decreasing frequency using the following definitions: frequent adverse reactions are defined as those occurring in at least 1/100 patients; infrequent adverse reactions are those occurring in 1/100 to 1/1,000 patients; rare adverse reactions are those occurring in fewer than 1/1,000 patients.
Body as a Whole
Infrequent: Allergic reaction, chills, malaise.
Cardiovascular System
Infrequent: Flushing, hot flashes, hypertension, palpitations, postural hypotension, syncope, tachycardia, vasodilation.
Dermatological
Infrequent: Acne, alopecia, hirsutism, maculopapular rash, skin discoloration, urticaria. Rare: Angioedema, erythema, exfoliative dermatitis, fungal dermatitis, herpes zoster, leukoderma, multiforme erythema, petechial rash, pustular rash, Stevens-Johnson syndrome, vesiculobullous rash.
Digestive System
Infrequent: Dysphagia, eructation, gastritis, gingivitis, increased appetite, increased salivation, liver function tests abnormal, mouth ulceration.
Rare: Gastrointestinal hemorrhage, glossitis, gum hemorrhage, gum hyperplasia, hematemesis, hemorrhagic colitis, hepatitis, melena, stomach ulcer, stomatitis, tongue edema.
Endocrine System
Rare: Goiter, hypothyroidism.
Hematologic and Lymphatic System
Infrequent: Ecchymosis, leukopenia.
Rare: Anemia, eosinophilia, fibrin decrease, fibrinogen decrease, iron deficiency anemia, leukocytosis, lymphocytosis, macrocytic anemia, petechia, thrombocytopenia.
Metabolic and Nutritional Disorders
Infrequent: Aspartate transaminase increased.
Rare: Alcohol intolerance, alkaline phosphatase increase, alanine transaminase increase, bilirubinemia, general edema, gamma glutamyl transpeptidase increase, hyperglycemia.
Musculoskeletal System
Infrequent: Arthritis, leg cramps, myasthenia, twitching.
Rare: Bursitis, muscle atrophy, pathological fracture, tendinous contracture.
Nervous System
Frequent: Confusion, paresthesia.
Infrequent: Akathisia, apathy, aphasia, central nervous system depression, depersonalization, dysarthria, dyskinesia, euphoria, hallucinations, hostility, hyperkinesia, hypertonia, libido decreased, memory decrease, mind racing, movement disorder, myoclonus, panic attack, paranoid reaction, personality disorder, psychosis, sleep disorder, stupor, suicidal ideation. Rare: Choreoathetosis, delirium, delusions, dysphoria, dystonia, extrapyramidal syndrome, faintness, grand mal convulsions, hemiplegia, hyperalgesia, hyperesthesia, hypokinesia, hypotonia, manic depression reaction, muscle spasm, neuralgia, neurosis, paralysis, peripheral neuritis.
Respiratory System
Infrequent: Yawn.
Rare: Hiccup, hyperventilation.
Special Senses
Frequent: Amblyopia. Infrequent: Abnormality of accommodation, conjunctivitis, dry eyes, ear pain, photophobia, taste perversion, tinnitus.
Rare: Deafness, lacrimation disorder, oscillopsia, parosmia, ptosis, strabismus, taste loss, uveitis, visual field defect.
Urogenital System
Infrequent: Abnormal ejaculation, hematuria, impotence, menorrhagia, polyuria, urinary incontinence.
Rare: Acute kidney failure, anorgasmia, breast abscess, breast neoplasm, creatinine increase, cystitis, dysuria, epididymitis, female lactation, kidney failure, kidney pain, nocturia, urinary retention, urinary urgency.
The following adverse reactions have been identified during postapproval use of lamotrigine tablets (chewable, dispersible). Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Blood and Lymphatic
Agranulocytosis, hemolytic anemia, lymphadenopathy not associated with hypersensitivity disorder.
Gastrointestinal
Esophagitis.
Hepatobiliary Tract and Pancreas
Pancreatitis.
Immunologic
Lupus-like reaction, vasculitis.
Lower Respiratory
Apnea.
Musculoskeletal
Rhabdomyolysis has been observed in patients experiencing hypersensitivity reactions.
Nervous System
Aggression, exacerbation of Parkinsonian symptoms in patients with pre-existing Parkinson’s disease, tics.
Non-site Specific
Progressive immunosuppression.
Significant drug interactions with lamotrigine are summarized in this section. Additional details of these drug interaction studies are provided in the Clinical Pharmacology section [see Clinical Pharmacology (12.3)].
Table 13. Established and Other Potentially Significant Drug Interactions
Concomitant Drug | Effect on Concentration of Lamotrigine or Concomitant Drug | Clinical Comment |
Estrogen-containing oral contraceptive preparations containing 30 mcg ethinylestradiol and 150 mcg levonorgestrel | ↓ lamotrigine ↓ levonorgestrel | Decreased lamotrigine concentrations approximately 50%. Decrease in levonorgestrel component by 19%. |
Carbamazepine and carbamazepine epoxide | ↓ lamotrigine ? carbamazepine epoxide | Addition of carbamazepine decreases lamotrigine concentration approximately 40%. May increase carbamazepine epoxide levels. |
Lopinavir/ritonavir | ↓ lamotrigine | Decreased lamotrigine concentration approximately 50%. |
Atazanavir/ritonavir | ↓ lamotrigine | Decreased lamotrigine AUC approximately 32%. |
Phenobarbital/primidone | ↓ lamotrigine | Decreased lamotrigine concentration approximately 40%. |
Phenytoin | ↓ lamotrigine | Decreased lamotrigine concentration approximately 40%. |
Rifampin | ↓ lamotrigine | Decreased lamotrigine AUC approximately 40%. |
Valproate | ↑ lamotrigine | Increased lamotrigine concentrations slightly more than 2-fold. |
? valproate | There are conflicting study results regarding effect of lamotrigine on valproate concentrations: 1) a mean 25% decrease in valproate concentrations in healthy volunteers, 2) no change in valproate concentrations in controlled clinical trials in patients with epilepsy. |
↓ = Decreased (induces lamotrigine glucuronidation).
↑ = Increased (inhibits lamotrigine glucuronidation).
? = Conflicting data.
Effect of Lamotrigine on Organic Cationic Transporter 2 Substrates
Lamotrigine is an inhibitor of renal tubular secretion via organic cationic transporter 2 (OCT2) proteins [see Clinical Pharmacology (12.3)]. This may result in increased plasma levels of certain drugs that are substantially excreted via this route. Coadministration of lamotrigine with OCT2 substrates with a narrow therapeutic index (e.g., dofetilide) is not recommended.
As with other AEDs, physiological changes during pregnancy may affect lamotrigine concentrations and/or therapeutic effect. There have been reports of decreased lamotrigine concentrations during pregnancy and restoration of pre-partum concentrations after delivery. Dosage adjustments may be necessary to maintain clinical response.
Pregnancy Category C
There are no adequate and well-controlled studies in pregnant women. In animal studies, lamotrigine was developmentally toxic at doses lower than those administered clinically. Lamotrigine should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. When lamotrigine was administered to pregnant mice, rats, or rabbits during the period of organogenesis (oral doses of up to 125, 25, and 30 mg/kg, respectively), reduced fetal body weight and increased incidences of fetal skeletal variations were seen in mice and rats at doses that were also maternally toxic. The no-effect doses for embryofetal developmental toxicity in mice, rats, and rabbits (75, 6.25, and 30 mg/kg, respectively) are similar to (mice and rabbits) or less than (rats) the human dose of 400 mg/day on a body surface area (mg/m2) basis.
In a study in which pregnant rats were administered lamotrigine (oral doses of 5 or 25 mg/kg) during the period of organogenesis and offspring were evaluated postnatally, behavioral abnormalities were observed in exposed offspring at both doses. The lowest effect dose for developmental neurotoxicity in rats is less than the human dose of 400 mg/day on a mg/m2 basis. Maternal toxicity was observed at the higher dose tested.
When pregnant rats were administered lamotrigine (oral doses of 5, 10, or 20 mg/kg) during the latter part of gestation, increased offspring mortality (including stillbirths) was seen at all doses. The lowest effect dose for peri/postnatal developmental toxicity in rats is less than the human dose of 400 mg/day on a mg/m2 basis. Maternal toxicity was observed at the 2 highest doses tested.
Lamotrigine decreases fetal folate concentrations in rat, an effect known to be associated with adverse pregnancy outcomes in animals and humans.
Pregnancy Registry
To provide information regarding the effects of in utero exposure to lamotrigine, physicians are advised to recommend that pregnant patients taking lamotrigine enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry. This can be done by calling the toll-free number 1-888-233-2334 and must be done by patients themselves. Information on the registry can also be found at the website http://www.aedpregnancyregistry.org.
The effect of lamotrigine on labor and delivery in humans is unknown.
Lamotrigine is present in milk from lactating women taking lamotrigine tablets (chewable, dispersible). Data from multiple small studies indicate that lamotrigine plasma levels in human milk-fed infants have been reported to be as high as 50% of the maternal serum levels. Neonates and young infants are at risk for high serum levels because maternal serum and milk levels can rise to high levels postpartum if lamotrigine dosage has been increased during pregnancy but not later reduced to the pre-pregnancy dosage. Lamotrigine exposure is further increased due to the immaturity of the infant glucuronidation capacity needed for drug clearance. Events including apnea, drowsiness, and poor sucking have been reported in infants who have been human milk-fed by mothers using lamotrigine; whether or not these events were caused by lamotrigine is unknown. Human milk-fed infants should be closely monitored for adverse events resulting from lamotrigine. Measurement of infant serum levels should be performed to rule out toxicity if concerns arise. Human milk-feeding should be discontinued in infants with lamotrigine toxicity. Caution should be exercised when lamotrigine is administered to a nursing woman.
Epilepsy
Lamotrigine is indicated as adjunctive therapy in patients aged 2 years and older for partial-onset seizures, the generalized seizures of Lennox-Gastaut syndrome, and PGTC seizures.
Safety and efficacy of lamotrigine used as adjunctive treatment for partial-onset seizures were not demonstrated in a small, randomized, double-blind, placebo-controlled withdrawal trial in very young pediatric patients (aged 1 to 24 months). Lamotrigine was associated with an increased risk for infectious adverse reactions (lamotrigine 37%, placebo 5%), and respiratory adverse reactions (lamotrigine 26%, placebo 5%). Infectious adverse reactions included bronchiolitis, bronchitis, ear infection, eye infection, otitis externa, pharyngitis, urinary tract infection, and viral infection. Respiratory adverse reactions included nasal congestion, cough, and apnea.
Additional information describing a clinical study in which efficacy was not demonstrated in pediatric patients ages 10 to 17 years is approved for GlaxoSmithKline LLC’s LAMICTAL® (lamotrigine) products. However, due to GlaxoSmithKline LLC’s marketing exclusivity rights, this drug product is not labeled with that pediatric information.
Juvenile Animal Data
In a juvenile animal study in which lamotrigine (oral doses of 5, 15, or 30 mg/kg) was administered to young rats (postnatal days 7 to 62), decreased viability and growth were seen at the highest dose tested and long-term behavioral abnormalities (decreased locomotor activity, increased reactivity, and learning deficits in animals tested as adults) were observed at the 2 highest doses. The no-effect dose for adverse effects on neurobehavioral development is less than the human dose of 400 mg/day on a mg/m2 basis.
Clinical trials of lamotrigine for epilepsy and bipolar disorder did not include sufficient numbers of patients aged 65 years and older to determine whether they respond differently from younger patients or exhibit a different safety profile than that of younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function and of concomitant disease or other drug therapy.
Experience in patients with hepatic impairment is limited. Based on a clinical pharmacology study in 24 subjects with mild, moderate, and severe liver impairment [see Clinical Pharmacology (12.3)], the following general recommendations can be made. No dosage adjustment is needed in patients with mild liver impairment. Initial, escalation, and maintenance doses should generally be reduced by approximately 25% in patients with moderate and severe liver impairment without ascites and 50% in patients with severe liver impairment with ascites. Escalation and maintenance doses may be adjusted according to clinical response [see Dosage and Administration (2.1)].
Lamotrigine is metabolized mainly by glucuronic acid conjugation, with the majority of the metabolites being recovered in the urine. In a small study comparing a single dose of lamotrigine in subjects with varying degrees of renal impairment with healthy volunteers, the plasma half-life of lamotrigine was approximately twice as long in the subjects with chronic renal failure [see Clinical Pharmacology (12.3)].
Initial doses of lamotrigine should be based on patients’ AED regimens; reduced maintenance doses may be effective for patients with significant renal impairment. Few patients with severe renal impairment have been evaluated during chronic treatment with lamotrigine. Because there is inadequate experience in this population, lamotrigine should be used with caution in these patients [see Dosage and Administration (2.1)].
Overdoses involving quantities up to 15 g have been reported for lamotrigine, some of which have been fatal. Overdose has resulted in ataxia, nystagmus, seizures (including tonic-clonic seizures), decreased level of consciousness, coma, and intraventricular conduction delay.
There are no specific antidotes for lamotrigine. Following a suspected overdose, hospitalization of the patient is advised. General supportive care is indicated, including frequent monitoring of vital signs and close observation of the patient. If indicated, emesis should be induced; usual precautions should be taken to protect the airway. It should be kept in mind that immediate-release lamotrigine is rapidly absorbed [see Clinical Pharmacology (12.3)]. It is uncertain whether hemodialysis is an effective means of removing lamotrigine from the blood. In 6 renal failure patients, about 20% of the amount of lamotrigine in the body was removed by hemodialysis during a 4-hour session. A Poison Control Center should be contacted for information on the management of overdosage of lamotrigine.
Lamotrigine, USP, an AED of the phenyltriazine class, is chemically unrelated to existing AEDs. Lamotrigine’s chemical name is 3,5-diamino-6-(2,3-dichlorophenyl)-as-triazine, its molecular formula is C9H7N5Cl2, and its molecular weight is 256.09. Lamotrigine, USP is a white to pale cream-colored powder and has a pKa of 5.7. Lamotrigine, USP is very slightly soluble in water (0.17 mg/mL at 25°C) and slightly soluble in 0.1 M HCl (4.1 mg/mL at 25°C). The structural formula is:
Lamotrigine Tablets (Chewable, Dispersible) 5 mg and 25 mg are supplied for oral administration. The tablets contain 5 mg (white to off-white) or 25 mg (white to off-white) of lamotrigine USP and the following inactive ingredients: aspartame, colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, strawberry guarana 586997 AP 0551 and povidone K-25.
The precise mechanism(s) by which lamotrigine exerts its anticonvulsant action are unknown. In animal models designed to detect anticonvulsant activity, lamotrigine was effective in preventing seizure spread in the maximum electroshock (MES) and pentylenetetrazol (scMet) tests, and prevented seizures in the visually and electrically evoked after-discharge (EEAD) tests for antiepileptic activity. Lamotrigine also displayed inhibitory properties in the kindling model in rats both during kindling development and in the fully kindled state. The relevance of these models to human epilepsy, however, is not known.
One proposed mechanism of action of lamotrigine, the relevance of which remains to be established in humans, involves an effect on sodium channels. In vitro pharmacological studies suggest that lamotrigine inhibits voltage-sensitive sodium channels, thereby stabilizing neuronal membranes and consequently modulating presynaptic transmitter release of excitatory amino acids (e.g., glutamate and aspartate).
Lamotrigine did not inhibit N-methyl d-aspartate (NMDA)-induced depolarizations in rat cortical slices or NMDA-induced cyclic GMP formation in immature rat cerebellum, nor did lamotrigine displace compounds that are either competitive or noncompetitive ligands at this glutamate receptor complex (CNQX, CGS, TCHP). The IC50 for lamotrigine effects on NMDA-induced currents (in the presence of 3 µM of glycine) in cultured hippocampal neurons exceeded 100 µM.
The mechanisms by which lamotrigine exerts its therapeutic action in bipolar disorder have not been established.
Folate Metabolism
In vitro, lamotrigine inhibited dihydrofolate reductase, the enzyme that catalyzes the reduction of dihydrofolate to tetrahydrofolate. Inhibition of this enzyme may interfere with the biosynthesis of nucleic acids and proteins. When oral daily doses of lamotrigine were given to pregnant rats during organogenesis, fetal, placental, and maternal folate concentrations were reduced. Significantly reduced concentrations of folate are associated with teratogenesis [see Use in Specific Populations (8.1)]. Folate concentrations were also reduced in male rats given repeated oral doses of lamotrigine. Reduced concentrations were partially returned to normal when supplemented with folinic acid.
Accumulation in Kidneys
Lamotrigine accumulated in the kidney of the male rat, causing chronic progressive nephrosis, necrosis, and mineralization. These findings are attributed to α-2 microglobulin, a species- and sex-specific protein that has not been detected in humans or other animal species.
Melanin Binding
Lamotrigine binds to melanin-containing tissues, e.g., in the eye and pigmented skin. It has been found in the uveal tract up to 52 weeks after a single dose in rodents.
Cardiovascular
In dogs, lamotrigine is extensively metabolized to a 2-N-methyl metabolite. This metabolite causes dose-dependent prolongation of the PR interval, widening of the QRS complex, and, at higher doses, complete AV conduction block. Similar cardiovascular effects are not anticipated in humans because only trace amounts of the 2-N-methyl metabolite (<0.6% of lamotrigine dose) have been found in human urine [see Clinical Pharmacology (12.3)]. However, it is conceivable that plasma concentrations of this metabolite could be increased in patients with a reduced capacity to glucuronidate lamotrigine (e.g., in patients with liver disease, patients taking concomitant medications that inhibit glucuronidation).
The pharmacokinetics of lamotrigine have been studied in subjects with epilepsy, healthy young and elderly volunteers, and volunteers with chronic renal failure. Lamotrigine pharmacokinetic parameters for adult and pediatric subjects and healthy normal volunteers are summarized in Tables 14 and 16.
Adult Study Population | Number of Subjects | Tmax: Time of Maximum Plasma Concentration (h) | t1/2: Elimination Half-life (h) | CL/F: Apparent Plasma Clearance (mL/min/kg) |
Healthy volunteers taking no other medications: |
|
|
|
|
Single-dose lamotrigine | 179 | 2.2 (0.25 to 12) | 32.8 (14 to 103) | 0.44 (0.12 to 1.1) |
Multiple-dose lamotrigine | 36 | 1.7 (0.5 to 4) | 25.4 (11.6 to 61.6) | 0.58 (0.24 to 1.15) |
Healthy volunteers taking valproate: | ||||
Single-dose lamotrigine | 6 | 1.8 (1 to 4) | 48.3 (31.5 to 88.6) | 0.3 (0.14 to 0.42) |
Multiple-dose lamotrigine | 18 | 1.9 (0.5 to 3.5) | 70.3 (41.9 to 113.5) | 0.18 (0.12 to 0.33) |
Subjects with epilepsy taking valproate only: | ||||
Single-dose lamotrigine | 4 | 4.8 (1.8 to 8.4) | 58.8 (30.5 to 88.8) | 0.28 (0.16 to 0.4) |
Subjects with epilepsy taking carbamazepine, phenytoin, phenobarbital, or primidoneb plus valproate: | ||||
Single-dose lamotrigine | 25 | 3.8 (1 to 10) | 27.2 (11.2 to 51.6) | 0.53 (0.27 to 1.04) |
Subjects with epilepsy taking carbamazepine, phenytoin, phenobarbital, or primidone:b | ||||
Single-dose lamotrigine | 24 | 2.3 (0.5 to 5) | 14.4 (6.4 to 30.4) | 1.1 (0.51 to 2.22) |
Multiple-dose lamotrigine | 17 | 2 (0.75 to 5.93) | 12.6 (7.5 to 23.1) | 1.21 (0.66 to 1.82) |
Lamotrigine is rapidly and completely absorbed after oral administration with negligible first-pass metabolism (absolute bioavailability is 98%). The bioavailability is not affected by food. Peak plasma concentrations occur anywhere from 1.4 to 4.8 hours following drug administration. The lamotrigine chewable/dispersible tablets were found to be equivalent, whether administered as dispersed in water, chewed and swallowed, or swallowed whole, to the lamotrigine compressed tablets in terms of rate and extent of absorption. In terms of rate and extent of absorption, lamotrigine orally disintegrating tablets, whether disintegrated in the mouth or swallowed whole with water, were equivalent to the lamotrigine compressed tablets swallowed with water.
In healthy volunteers not receiving any other medications and given single doses, the plasma concentrations of lamotrigine increased in direct proportion to the dose administered over the range of 50 to 400 mg. In 2 small studies (n = 7 and 8) of patients with epilepsy who were maintained on other AEDs, there also was a linear relationship between dose and lamotrigine plasma concentrations at steady state following doses of 50 to 350 mg twice daily.
Estimates of the mean apparent volume of distribution (Vd/F) of lamotrigine following oral administration ranged from 0.9 to 1.3 L/kg. Vd/F is independent of dose and is similar following single and multiple doses in both patients with epilepsy and in healthy volunteers.
Data from in vitro studies indicate that lamotrigine is approximately 55% bound to human plasma proteins at plasma lamotrigine concentrations from 1 to 10 mcg/mL (10 mcg/mL is 4 to 6 times the trough plasma concentration observed in the controlled efficacy trials). Because lamotrigine is not highly bound to plasma proteins, clinically significant interactions with other drugs through competition for protein binding sites are unlikely. The binding of lamotrigine to plasma proteins did not change in the presence of therapeutic concentrations of phenytoin, phenobarbital, or valproate. Lamotrigine did not displace other AEDs (carbamazepine, phenytoin, phenobarbital) from protein-binding sites.
Lamotrigine is metabolized predominantly by glucuronic acid conjugation; the major metabolite is an inactive 2-N-glucuronide conjugate. After oral administration of 240 mg of 14C-lamotrigine (15 μCi) to 6 healthy volunteers, 94% was recovered in the urine and 2% was recovered in the feces. The radioactivity in the urine consisted of unchanged lamotrigine (10%), the 2-N-glucuronide (76%), a 5-N-glucuronide (10%), a 2-N-methyl metabolite (0.14%), and other unidentified minor metabolites (4%).
The effects of lamotrigine on the induction of specific families of mixed-function oxidase isozymes have not been systematically evaluated.
Following multiple administrations (150 mg twice daily) to normal volunteers taking no other medications, lamotrigine induced its own metabolism, resulting in a 25% decrease in t½ and a 37% increase in CL/F at steady state compared with values obtained in the same volunteers following a single dose. Evidence gathered from other sources suggests that self-induction by lamotrigine may not occur when lamotrigine is given as adjunctive therapy in patients receiving enzyme-inducing drugs such as carbamazepine, phenytoin, phenobarbital, primidone, or other drugs such as rifampin and the protease inhibitors lopinavir/ritonavir and atazanavir/ritonavir that induce lamotrigine glucuronidation [see Drug Interactions (7)].
The elimination half-life and apparent clearance of lamotrigine following oral administration of lamotrigine to adult subjects with epilepsy and healthy volunteers is summarized in Table 14. Half-life and apparent oral clearance vary depending on concomitant AEDs.
The apparent clearance of lamotrigine is affected by the coadministration of certain medications [see Warnings and Precautions (5.7, 5.11), Drug Interactions (7)].
The net effects of drug interactions with lamotrigine are summarized in Tables 13 and 15, followed by details of the drug interaction studies below.
Drug | Drug Plasma Concentration with Adjunctive Lamotriginea | Lamotrigine Plasma Concentration with Adjunctive Drugsb |
Oral contraceptives (e.g., ethinylestradiol/levonorgestrel)c | ↔d | ↓ |
Aripiprazole | Not assessed | ↔e |
Atazanavir/ritonavir | ↔f | ↓ |
Bupropion | Not assessed | ↔ |
Carbamazepine | ↔ | ↓ |
Carbamazepine epoxideg | ? | |
Felbamate | Not assessed | ↔ |
Gabapentin | Not assessed | ↔ |
Levetiracetam | ↔ | ↔ |
Lithium | ↔ | Not assessed |
Lopinavir/ritonavir | ↔e | ↓ |
Olanzapine | ↔ | ↔e |
Oxcarbazepine | ↔ | ↔ |
10-Monohydroxy oxcarbazepine metaboliteh | ↔ | |
Phenobarbital/primidone | ↔ | ↓ |
Phenytoin | ↔ | ↓ |
Pregabalin | ↔ | ↔ |
Rifampin | Not assessed | ↓ |
Risperidone | ↔ | Not assessed |
9-Hydroxyrisperidonei | ↔ | |
Topiramate | ↔j | ↔ |
Valproate | ↓ | ↑ |
Valproate + phenytoin and/or carbamazepine | Not assessed | ↔ |
Zonisamide | Not assessed | ↔ |
a From adjunctive clinical trials and volunteer trials.
d Modest decrease in levonorgestrel.
e Slight decrease, not expected to be clinically meaningful.
f Compared with historical controls.
g Not administered, but an active metabolite of carbamazepine.
h Not administered, but an active metabolite of oxcarbazepine.
i Not administered, but an active metabolite of risperidone.
j Slight increase, not expected to be clinically meaningful.
↔ = No significant effect.
? = Conflicting data.
Estrogen-Containing Oral Contraceptives
In 16 female volunteers, an oral contraceptive preparation containing 30 mcg ethinylestradiol and 150 mcg levonorgestrel increased the apparent clearance of lamotrigine (300 mg/day) by approximately 2-fold with mean decreases in AUC of 52% and in Cmax of 39%. In this study, trough serum lamotrigine concentrations gradually increased and were approximately 2-fold higher on average at the end of the week of the inactive hormone preparation compared with trough lamotrigine concentrations at the end of the active hormone cycle.
Gradual transient increases in lamotrigine plasma levels (approximate 2-fold increase) occurred during the week of inactive hormone preparation (pill-free week) for women not also taking a drug that increased the clearance of lamotrigine (carbamazepine, phenytoin, phenobarbital, primidone, or other drugs such as rifampin and the protease inhibitors lopinavir/ritonavir and atazanavir/ritonavir that induce lamotrigine glucuronidation) [see Drug Interactions (7)]. The increase in lamotrigine plasma levels will be greater if the dose of lamotrigine is increased in the few days before or during the pill-free week. Increases in lamotrigine plasma levels could result in dose-dependent adverse reactions.
In the same study, coadministration of lamotrigine (300 mg/day) in 16 female volunteers did not affect the pharmacokinetics of the ethinylestradiol component of the oral contraceptive preparation. There were mean decreases in the AUC and Cmax of the levonorgestrel component of 19% and 12%, respectively. Measurement of serum progesterone indicated that there was no hormonal evidence of ovulation in any of the 16 volunteers, although measurement of serum FSH, LH, and estradiol indicated that there was some loss of suppression of the hypothalamic-pituitary-ovarian axis.
The effects of doses of lamotrigine other than 300 mg/day have not been systematically evaluated in controlled clinical trials.
The clinical significance of the observed hormonal changes on ovulatory activity is unknown. However, the possibility of decreased contraceptive efficacy in some patients cannot be excluded. Therefore, patients should be instructed to promptly report changes in their menstrual pattern (e.g., break-through bleeding).
Dosage adjustments may be necessary for women receiving estrogen-containing oral contraceptive preparations [see Dosage and Administration (2.1)].
The effect of other hormonal contraceptive preparations or hormone replacement therapy on the pharmacokinetics of lamotrigine has not been systematically evaluated. It has been reported that ethinylestradiol, not progestogens, increased the clearance of lamotrigine up to 2-fold, and the progestin-only pills had no effect on lamotrigine plasma levels. Therefore, adjustments to the dosage of lamotrigine in the presence of progestogens alone will likely not be needed.
Aripiprazole
In 18 patients with bipolar disorder on a stable regimen of 100 to 400 mg/day of lamotrigine, the lamotrigine AUC and Cmax were reduced by approximately 10% in patients who received aripiprazole 10 to 30 mg/day for 7 days, followed by 30 mg/day for an additional 7 days. This reduction in lamotrigine exposure is not considered clinically meaningful.
Atazanavir/Ritonavir
In a study in healthy volunteers, daily doses of atazanavir/ritonavir (300 mg/100 mg) reduced the plasma AUC and Cmax of lamotrigine (single 100-mg dose) by an average of 32% and 6%, respectively, and shortened the elimination half-lives by 27%. In the presence of atazanavir/ritonavir (300 mg/100 mg), the metabolite-to-lamotrigine ratio was increased from 0.45 to 0.71 consistent with induction of glucuronidation. The pharmacokinetics of atazanavir/ritonavir were similar in the presence of concomitant lamotrigine to the historical data of the pharmacokinetics in the absence of lamotrigine.
Bupropion
The pharmacokinetics of a 100-mg single dose of lamotrigine in healthy volunteers (n = 12) were not changed by coadministration of bupropion sustained-release formulation (150 mg twice daily) starting 11 days before lamotrigine.
Carbamazepine
Lamotrigine has no appreciable effect on steady-state carbamazepine plasma concentration. Limited clinical data suggest there is a higher incidence of dizziness, diplopia, ataxia, and blurred vision in patients receiving carbamazepine with lamotrigine than in patients receiving other AEDs with lamotrigine [see Adverse Reactions (6.1)]. The mechanism of this interaction is unclear. The effect of lamotrigine on plasma concentrations of carbamazepine-epoxide is unclear. In a small subset of patients (n = 7) studied in a placebo-controlled trial, lamotrigine had no effect on carbamazepine-epoxide plasma concentrations, but in a small, uncontrolled study (n = 9), carbamazepine-epoxide levels increased.
The addition of carbamazepine decreases lamotrigine steady-state concentrations by approximately 40%.
Felbamate
In a trial in 21 healthy volunteers, coadministration of felbamate (1,200 mg twice daily) with lamotrigine (100 mg twice daily for 10 days) appeared to have no clinically relevant effects on the pharmacokinetics of lamotrigine.
Folate Inhibitors
Lamotrigine is a weak inhibitor of dihydrofolate reductase. Prescribers should be aware of this action when prescribing other medications that inhibit folate metabolism.
Gabapentin
Based on a retrospective analysis of plasma levels in 34 subjects who received lamotrigine both with and without gabapentin, gabapentin does not appear to change the apparent clearance of lamotrigine.
Levetiracetam
Potential drug interactions between levetiracetam and lamotrigine were assessed by evaluating serum concentrations of both agents during placebo-controlled clinical trials. These data indicate that lamotrigine does not influence the pharmacokinetics of levetiracetam and that levetiracetam does not influence the pharmacokinetics of lamotrigine.
Lithium
The pharmacokinetics of lithium were not altered in healthy subjects (n = 20) by coadministration of lamotrigine (100 mg/day) for 6 days.
Lopinavir/Ritonavir
The addition of lopinavir (400 mg twice daily)/ritonavir (100 mg twice daily) decreased the AUC, Cmax, and elimination half-life of lamotrigine by approximately 50% to 55.4% in 18 healthy subjects. The pharmacokinetics of lopinavir/ritonavir were similar with concomitant lamotrigine, compared with that in historical controls.
Olanzapine
The AUC and Cmax of olanzapine were similar following the addition of olanzapine (15 mg once daily) to lamotrigine (200 mg once daily) in healthy male volunteers (n = 16) compared with the AUC and Cmax in healthy male volunteers receiving olanzapine alone (n = 16).
In the same trial, the AUC and Cmax of lamotrigine were reduced on average by 24% and 20%, respectively, following the addition of olanzapine to lamotrigine in healthy male volunteers compared with those receiving lamotrigine alone. This reduction in lamotrigine plasma concentrations is not expected to be clinically meaningful.
Oxcarbazepine
The AUC and Cmax of oxcarbazepine and its active 10-monohydroxy oxcarbazepine metabolite were not significantly different following the addition of oxcarbazepine (600 mg twice daily) to lamotrigine (200 mg once daily) in healthy male volunteers (n = 13) compared with healthy male volunteers receiving oxcarbazepine alone (n = 13).
In the same trial, the AUC and Cmax of lamotrigine were similar following the addition of oxcarbazepine (600 mg twice daily) to lamotrigine in healthy male volunteers compared with those receiving lamotrigine alone. Limited clinical data suggest a higher incidence of headache, dizziness, nausea, and somnolence with coadministration of lamotrigine and oxcarbazepine compared with lamotrigine alone or oxcarbazepine alone.
Phenobarbital, Primidone
The addition of phenobarbital or primidone decreases lamotrigine steady-state concentrations by approximately 40%.
Phenytoin
Lamotrigine has no appreciable effect on steady-state phenytoin plasma concentrations in patients with epilepsy. The addition of phenytoin decreases lamotrigine steady-state concentrations by approximately 40%.
Pregabalin
Steady-state trough plasma concentrations of lamotrigine were not affected by concomitant pregabalin (200 mg 3 times daily) administration. There are no pharmacokinetic interactions between lamotrigine and pregabalin.
Rifampin
In 10 male volunteers, rifampin (600 mg/day for 5 days) significantly increased the apparent clearance of a single 25-mg dose of lamotrigine by approximately 2-fold (AUC decreased by approximately 40%).
Risperidone
In a 14 healthy volunteers study, multiple oral doses of lamotrigine 400 mg daily had no clinically significant effect on the single-dose pharmacokinetics of risperidone 2 mg and its active metabolite 9-OH risperidone. Following the coadministration of risperidone 2 mg with lamotrigine, 12 of the 14 volunteers reported somnolence compared with 1 out of 20 when risperidone was given alone, and none when lamotrigine was administered alone.
Topiramate
Topiramate resulted in no change in plasma concentrations of lamotrigine. Administration of lamotrigine resulted in a 15% increase in topiramate concentrations.
Valproate
When lamotrigine was administered to healthy volunteers (n = 18) receiving valproate, the trough steady-state valproate plasma concentrations decreased by an average of 25% over a 3-week period, and then stabilized. However, adding lamotrigine to the existing therapy did not cause a change in valproate plasma concentrations in either adult or pediatric patients in controlled clinical trials.
The addition of valproate increased lamotrigine steady-state concentrations in normal volunteers by slightly more than 2-fold. In 1 trial, maximal inhibition of lamotrigine clearance was reached at valproate doses between 250 and 500 mg/day and did not increase as the valproate dose was further increased.
Zonisamide
In a study in 18 patients with epilepsy, coadministration of zonisamide (200 to 400 mg/day) with lamotrigine (150 to 500 mg/day for 35 days) had no significant effect on the pharmacokinetics of lamotrigine.
Known Inducers or Inhibitors of Glucuronidation
Drugs other than those listed above have not been systematically evaluated in combination with lamotrigine. Since lamotrigine is metabolized predominately by glucuronic acid conjugation, drugs that are known to induce or inhibit glucuronidation may affect the apparent clearance of lamotrigine and doses of lamotrigine may require adjustment based on clinical response.
Other
In vitro assessment of the inhibitory effect of lamotrigine at OCT2 demonstrate that lamotrigine, but not the N(2)-glucuronide metabolite, is an inhibitor of OCT2 at potentially clinically relevant concentrations, with IC50 value of 53.8 μM [see Drug Interactions (7)].
Results of in vitro experiments suggest that clearance of lamotrigine is unlikely to be reduced by concomitant administration of amitriptyline, clonazepam, clozapine, fluoxetine, haloperidol, lorazepam, phenelzine, sertraline, or trazodone.
Results of in vitro experiments suggest that lamotrigine does not reduce the clearance of drugs eliminated predominantly by CYP2D6.
No evidence of carcinogenicity was seen in mouse or rat following oral administration of lamotrigine for up to 2 years at doses up to 30 mg/kg/day and 10 to 15 mg/kg/day in mouse and rat, respectively. The highest doses tested are less than the human dose of 400 mg/day on a body surface area (mg/m2) basis.
Lamotrigine was negative in in vitro gene mutation (Ames and mouse lymphoma tk) assays and in clastogenicity (in vitro human lymphocyte and in vivo rat bone marrow) assays.
No evidence of impaired fertility was detected in rats given oral doses of lamotrigine up to 20 mg/kg/day. The highest dose tested is less than the human dose of 400 mg/day on a mg/m2 basis.
The effectiveness of monotherapy with lamotrigine was established in a multicenter double-blind clinical trial enrolling 156 adult outpatients with partial-onset seizures. The patients experienced at least 4 simple partial-onset, complex partial-onset, and/or secondarily generalized seizures during each of 2 consecutive 4-week periods while receiving carbamazepine or phenytoin monotherapy during baseline. Lamotrigine (target dose of 500 mg/day) or valproate (1,000 mg/day) was added to either carbamazepine or phenytoin monotherapy over a 4-week period. Patients were then converted to monotherapy with lamotrigine or valproate during the next 4 weeks, then continued on monotherapy for an additional 12-week period.
Trial endpoints were completion of all weeks of trial treatment or meeting an escape criterion. Criteria for escape relative to baseline were: (1) doubling of average monthly seizure count, (2) doubling of highest consecutive 2-day seizure frequency, (3) emergence of a new seizure type (defined as a seizure that did not occur during the 8-week baseline) that is more severe than seizure types that occur during study treatment, or (4) clinically significant prolongation of generalized tonic-clonic seizures. The primary efficacy variable was the proportion of patients in each treatment group who met escape criteria.
The percentages of patients who met escape criteria were 42% (32/76) in the group receiving lamotrigine and 69% (55/80) in the valproate group. The difference in the percentage of patients meeting escape criteria was statistically significant (P = 0.0012) in favor of lamotrigine. No differences in efficacy based on age, sex, or race were detected.
Patients in the control group were intentionally treated with a relatively low dose of valproate; as such, the sole objective of this trial was to demonstrate the effectiveness and safety of monotherapy with lamotrigine, and cannot be interpreted to imply the superiority of lamotrigine to an adequate dose of valproate.
The effectiveness of lamotrigine as adjunctive therapy (added to other AEDs) was initially established in 3 pivotal, multicenter, placebo-controlled, double-blind clinical trials in 355 adults with refractory partial-onset seizures. The patients had a history of at least 4 partial-onset seizures per month in spite of receiving 1 or more AEDs at therapeutic concentrations and in 2 of the trials were observed on their established AED regimen during baselines that varied between 8 to 12 weeks. In the third trial, patients were not observed in a prospective baseline. In patients continuing to have at least 4 seizures per month during the baseline, lamotrigine or placebo was then added to the existing therapy. In all 3 trials, change from baseline in seizure frequency was the primary measure of effectiveness. The results given below are for all partial-onset seizures in the intent-to-treat population (all patients who received at least 1 dose of treatment) in each trial, unless otherwise indicated. The median seizure frequency at baseline was 3 per week while the mean at baseline was 6.6 per week for all patients enrolled in efficacy trials.
One trial (n = 216) was a double-blind, placebo-controlled, parallel trial consisting of a 24-week treatment period. Patients could not be on more than 2 other anticonvulsants and valproate was not allowed. Patients were randomized to receive placebo, a target dose of 300 mg/day of lamotrigine, or a target dose of 500 mg/day of lamotrigine. The median reductions in the frequency of all partial-onset seizures relative to baseline were 8% in patients receiving placebo, 20% in patients receiving 300 mg/day of lamotrigine, and 36% in patients receiving 500 mg/day of lamotrigine. The seizure frequency reduction was statistically significant in the 500-mg/day group compared with the placebo group, but not in the 300-mg/day group.
A second trial (n = 98) was a double-blind, placebo-controlled, randomized, crossover trial consisting of two 14-week treatment periods (the last 2 weeks of which consisted of dose tapering) separated by a 4-week washout period. Patients could not be on more than 2 other anticonvulsants and valproate was not allowed. The target dose of lamotrigine was 400 mg/day. When the first 12 weeks of the treatment periods were analyzed, the median change in seizure frequency was a 25% reduction on lamotrigine compared with placebo (P<0.001).
The third trial (n = 41) was a double-blind, placebo-controlled, crossover trial consisting of two 12-week treatment periods separated by a 4-week washout period. Patients could not be on more than 2 other anticonvulsants. Thirteen patients were on concomitant valproate; these patients received 150 mg/day of lamotrigine. The 28 other patients had a target dose of 300 mg/day of lamotrigine. The median change in seizure frequency was a 26% reduction on lamotrigine compared with placebo (P<0.01).
No differences in efficacy based on age, sex, or race, as measured by change in seizure frequency, were detected.
The effectiveness of lamotrigine as adjunctive therapy in pediatric patients with partial-onset seizures was established in a multicenter, double-blind, placebo-controlled trial in 199 patients aged 2 to 16 years (n = 98 on lamotrigine, n = 101 on placebo). Following an 8-week baseline phase, patients were randomized to 18 weeks of treatment with lamotrigine or placebo added to their current AED regimen of up to 2 drugs. Patients were dosed based on body weight and valproate use. Target doses were designed to approximate 5 mg/kg/day for patients taking valproate (maximum dose: 250 mg/day) and 15 mg/kg/day for the patients not taking valproate (maximum dose: 750 mg/day). The primary efficacy endpoint was percentage change from baseline in all partial-onset seizures. For the intent-to-treat population, the median reduction of all partial-onset seizures was 36% in patients treated with lamotrigine and 7% on placebo, a difference that was statistically significant (P<0.01).
The effectiveness of lamotrigine as adjunctive therapy in patients with Lennox-Gastaut syndrome was established in a multicenter, double-blind, placebo-controlled trial in 169 patients aged 3 to 25 years (n = 79 on lamotrigine, n = 90 on placebo). Following a 4-week single-blind, placebo phase, patients were randomized to 16 weeks of treatment with lamotrigine or placebo added to their current AED regimen of up to 3 drugs. Patients were dosed on a fixed-dose regimen based on body weight and valproate use. Target doses were designed to approximate 5 mg/kg/day for patients taking valproate (maximum dose: 200 mg/day) and 15 mg/kg/day for patients not taking valproate (maximum dose: 400 mg/day). The primary efficacy endpoint was percentage change from baseline in major motor seizures (atonic, tonic, major myoclonic, and tonic-clonic seizures). For the intent-to-treat population, the median reduction of major motor seizures was 32% in patients treated with lamotrigine and 9% on placebo, a difference that was statistically significant (P<0.05). Drop attacks were significantly reduced by lamotrigine (34%) compared with placebo (9%), as were tonic-clonic seizures (36% reduction versus 10% increase for lamotrigine and placebo, respectively).
The effectiveness of lamotrigine as adjunctive therapy in patients with PGTC seizures was established in a multicenter, double-blind, placebo controlled trial in 117 pediatric and adult patients aged 2 years and older (n = 58 on lamotrigine, n = 59 on placebo). Patients with at least 3 PGTC seizures during an 8-week baseline phase were randomized to 19 to 24 weeks of treatment with lamotrigine or placebo added to their current AED regimen of up to 2 drugs. Patients were dosed on a fixed-dose regimen, with target doses ranging from 3 to 12 mg/kg/day for pediatric patients and from 200 to 400 mg/day for adult patients based on concomitant AEDs.
The primary efficacy endpoint was percentage change from baseline in PGTC seizures. For the intent-to-treat population, the median percent reduction in PGTC seizures was 66% in patients treated with lamotrigine and 34% on placebo, a difference that was statistically significant (P = 0.006).
Adults
The effectiveness of lamotrigine in the maintenance treatment of bipolar I disorder was established in 2 multicenter, double-blind, placebo-controlled trials in adult patients (aged 18 to 82 years) who met DSM-IV criteria for bipolar I disorder. Trial 1 enrolled patients with a current or recent (within 60 days) depressive episode as defined by DSM-IV and Trial 2 included patients with a current or recent (within 60 days) episode of mania or hypomania as defined by DSM-IV. Both trials included a cohort of patients (30% of 404 subjects in Trial 1 and 28% of 171 patients in Trial 2) with rapid cycling bipolar disorder (4 to 6 episodes per year).
In both trials, patients were titrated to a target dose of 200 mg of lamotrigine, as add-on therapy or as monotherapy with gradual withdrawal of any psychotropic medications during an 8- to 16-week open-label period. Overall 81% of 1,305 patients participating in the open-label period were receiving 1 or more other psychotropic medications, including benzodiazepines, selective serotonin reuptake inhibitors (SSRIs), atypical antipsychotics (including olanzapine), valproate, or lithium, during titration of lamotrigine. Patients with a CGI-severity score of 3 or less maintained for at least 4 continuous weeks, including at least the final week on monotherapy with lamotrigine, were randomized to a placebo-controlled, double-blind treatment period for up to 18 months. The primary endpoint was TIME (time to intervention for a mood episode or one that was emerging, time to discontinuation for either an adverse event that was judged to be related to bipolar disorder, or for lack of efficacy). The mood episode could be depression, mania, hypomania, or a mixed episode.
In Trial 1, patients received double-blind monotherapy with lamotrigine 50 mg/day (n = 50), lamotrigine 200 mg/day (n = 124), lamotrigine 400 mg/day (n = 47), or placebo (n = 121). Lamotrigine (200- and 400-mg/day treatment groups combined) was superior to placebo in delaying the time to occurrence of a mood episode (Figure 1). Separate analyses of the 200- and 400-mg/day dose groups revealed no added benefit from the higher dose.
In Trial 2, patients received double-blind monotherapy with lamotrigine (100 to 400 mg/day, n = 59), or placebo (n = 70). Lamotrigine was superior to placebo in delaying time to occurrence of a mood episode (Figure 2). The mean dose of lamotrigine was about 211 mg/day.
Although these trials were not designed to separately evaluate time to the occurrence of depression or mania, a combined analysis for the 2 trials revealed a statistically significant benefit for lamotrigine over placebo in delaying the time to occurrence of both depression and mania, although the finding was more robust for depression.
Figure 1: Kaplan-Meier Estimation of Cumulative Proportion of Patients with Mood Episode (Trial 1)
Figure 2: Kaplan-Meier Estimation of Cumulative Proportion of Patients with Mood Episode (Trial 2)
Lamotrigine Tablets (Chewable, Dispersible), 5 mg White to off-white, caplet, flat faced beveled edged, uncoated tablets with score-line on one side and “228” debossed on the other side.
Bottles of 90 (NDC 68462-228-90)
Bottles of 100 (NDC 68462-228-01)
Bottles of 1000 (NDC 68462-228-10)
Lamotrigine Tablets (Chewable, Dispersible), 25 mg White to off-white, circular, flat faced beveled edged, uncoated tablets with ‘G’ debossed on one side and ‘229’ debossed on the other side.
Bottles of 90 (NDC 68462-229-90)
Bottles of 100 (NDC 68462-229-01)
Bottles of 1000 (NDC 68462-229-10)
Store at 20° to 25°C (68° to 77°F); excursions permitted to 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature] in a dry place and protect from light.
Advise the patient to read the FDA-approved patient labeling (Medication Guide).
Lamotrigine tablets (chewable, dispersible)
(la-moe'-tri-jeen)
What is the most important information I should know about lamotrigine tablets (chewable, dispersible)?
1. Lamotrigine tablets (chewable, dispersible) may cause a serious skin rash that may cause you to be hospitalized or even cause death.
There is no way to tell if a mild rash will become more serious. A serious skin rash can happen at any time during your treatment with lamotrigine tablets (chewable, dispersible), but is more likely to happen within the first 2 to 8 weeks of treatment. Children and teenagers aged between 2 and 17 years have a higher chance of getting this serious skin rash while taking lamotrigine tablets (chewable, dispersible).
The risk of getting a serious skin rash is higher if you:
Call your healthcare provider right away if you have any of the following:
These symptoms may be the first signs of a serious skin reaction. A healthcare provider should examine you to decide if you should continue taking lamotrigine tablets (chewable, dispersible).
2. Other serious reactions, including serious blood problems or liver problems. Lamotrigine tablets (chewable, dispersible) can also cause other types of allergic reactions or serious problems that may affect organs and other parts of your body like your liver or blood cells. You may or may not have a rash with these types of reactions. Call your healthcare provider right away if you have any of these symptoms:
3. Like other antiepileptic drugs, lamotrigine tablets (chewable, dispersible) may cause suicidal thoughts or actions in a very small number of people, about 1 in 500.
Call a healthcare provider right away if you have any of these symptoms, especially if they are new, worse, or worry you:
Do not stop lamotrigine tablets (chewable, dispersible) without first talking to a healthcare provider.
How can I watch for early symptoms of suicidal thoughts and actions in myself or a family member?
4. Lamotrigine tablets (chewable, dispersible) may cause aseptic meningitis, a serious inflammation of the protective membrane that covers the brain and spinal cord.
Call your healthcare provider right away if you have any of the following symptoms:
Meningitis has many causes other than lamotrigine tablets (chewable, dispersible), which your doctor would check for if you developed meningitis while taking lamotrigine tablets (chewable, dispersible).
Lamotrigine tablets (chewable, dispersible) can cause other serious side effects. For more information ask your healthcare provider or pharmacist. Tell your healthcare provider if you have any side effect that bothers you. Be sure to read the section below entitled “What are the possible side effects of lamotrigine tablets (chewable, dispersible)?”
5. People prescribed lamotrigine tablets (chewable, dispersible) have sometimes been given the wrong medicine because many medicines have names similar to lamotrigine tablets (chewable, dispersible), so always check that you receive lamotrigine tablets (chewable, dispersible).
Taking the wrong medication can cause serious health problems. When your healthcare provider gives you a prescription for lamotrigine tablets (chewable, dispersible):
These pictures show the distinct wording, colors, and shapes of the tablets that help to identify the right strength of lamotrigine tablets (chewable, dispersible). Immediately call your pharmacist if you receive lamotrigine tablets (chewable, dispersible) that do not look like one of the tablets shown below, as you may have received the wrong medication.
Lamotrigine Tablets (Chewable, Dispersible)
What are lamotrigine tablets (chewable, dispersible)?
Lamotrigine tablets (chewable, dispersible) are prescription medicine used:
It is not known if lamotrigine tablets (chewable, dispersible) are safe or effective in people younger than 18 years with mood episodes such as bipolar disorder or depression.
It is not known if lamotrigine tablets (chewable, dispersible) are safe or effective when used alone as the first treatment of seizures.
It is not known if lamotrigine tablets (chewable, dispersible) are safe or effective for people with mood episodes who have not already been treated with other medicines.
Lamotrigine tablets (chewable, dispersible) should not be used for acute treatment of manic or mixed mood episodes.
Who should not take lamotrigine tablets (chewable, dispersible)?
You should not take lamotrigine tablets (chewable, dispersible) if you have had an allergic reaction to lamotrigine or to any of the inactive ingredients in lamotrigine tablets (chewable, dispersible). See the end of this leaflet for a complete list of ingredients in lamotrigine tablets (chewable, dispersible).
What should I tell my healthcare provider before taking lamotrigine tablets (chewable, dispersible)?
Before taking lamotrigine tablets (chewable, dispersible), tell your healthcare provider about all of your medical conditions, including if you:
Tell your healthcare provider about all the medicines you take or if you are planning to take a new medicine, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
If you use lamotrigine tablets (chewable, dispersible) with certain other medicines, they can affect each other, causing side effects.
How should I take lamotrigine tablets (chewable, dispersible)?
What should I avoid while taking lamotrigine tablets (chewable, dispersible)?
Do not drive, operate machinery, or do other dangerous activities until you know how lamotrigine tablets (chewable, dispersible) affects you.
What are the possible side effects of lamotrigine tablets (chewable, dispersible)?
Lamotrigine tablets (chewable, dispersible) can cause serious side effects.
See “What is the most important information I should know about lamotrigine tablets (chewable, dispersible)?”
Common side effects of lamotrigine tablets (chewable, dispersible) include:
Tell your healthcare provider about any side effect that bothers you or that does not go away.
These are not all the possible side effects of lamotrigine tablets (chewable, dispersible). For more information, ask your healthcare provider or pharmacist.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
How should I store lamotrigine tablets (chewable, dispersible)?
General information about the safe and effective use of lamotrigine tablets (chewable, dispersible).
Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use lamotrigine tablets (chewable, dispersible) for a condition for which it was not prescribed. Do not give lamotrigine tablets (chewable, dispersible) to other people, even if they have the same symptoms you have. It may harm them.
If you take a urine drug screening test, lamotrigine tablets (chewable, dispersible) may make the test result positive for another drug. If you require a urine drug screening test, tell the healthcare professional administering the test that you are taking lamotrigine tablets (chewable, dispersible).
This Medication Guide summarizes the most important information about lamotrigine tablets (chewable, dispersible). If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about lamotrigine tablets (chewable, dispersible) that is written for healthcare professionals.
For more information, call 1 (888)721-7115.
What are the ingredients in lamotrigine tablets (chewable, dispersible)?
Active ingredient: lamotrigine
Inactive ingredients: aspartame, colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, strawberry guarana 586997 AP 0551 and povidone K-25.
This Medication Guide has been approved by the U.S. Food and Drug Administration.
Trademarks are the property of their respective owners.
Manufactured by:
Glenmark Pharmaceuticals Ltd.
Colvale-Bardez, Goa 403 513, India
Manufactured for:
Glenmark Pharmaceuticals Inc., USA
Mahwah, NJ 07430
Questions? 1 (888)721-7115
www.glenmarkpharma.com/usa
November 2017
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