Screening patients for bipolar disorder
A major depressive episode may be the initial presentation of bipolar disorder. It is generally believed (though not established in controlled studies) that treating such an episode with an antidepressant alone may increase the likelihood of precipitation of a mixed/manic episode in patients at risk for bipolar disorder. Whether any of the symptoms described above represent such a conversion is unknown. However, prior to initiating treatment with an antidepressant, patients with depressive symptoms should be adequately screened to determine if they are at risk for bipolar disorder; such screening should include a detailed psychiatric history, including a family history of suicide, bipolar disorder, and depression. It should be noted that FETZIMA is not approved for use in treating bipolar depression.
Patient exposure
The safety of FETZIMA was evaluated in 2,673 patients (18-78 years of age) diagnosed with MDD who participated in clinical studies, representing 942 patient-years of exposure. Among the 2,673 FETZIMA-treated patients, 1,583 were exposed to FETZIMA in short-term, placebo-controlled studies. There were 825 patients who continued from short-term studies into a one-year, open-label extension study.
Of the 2,673 patients exposed to at least one dose of FETZIMA, 737 patients were exposed to FETZIMA for at least 6 months and 367 were exposed for one year. In these studies FETZIMA was given at doses ranging from 40-120 mg once daily and was given without regard to food.
Adverse reactions reported as reasons for discontinuation of treatment
In the short-term placebo-controlled pre-marketing studies for MDD, 9% of the 1,583 patients who received FETZIMA (40-120 mg) discontinued treatment due to an adverse event, compared with 3% of the 1,040 placebo-treated patients in those studies. The most common adverse reaction leading to discontinuation in at least 1% of the FETZIMA-treated patients in the short-term placebo-controlled studies was nausea (1.5%).
Common adverse reactions in placebo-controlled MDD studies
The most commonly observed adverse events in FETZIMA-treated MDD patients in placebo-controlled studies (incidence ≥ 5% and at least twice the rate of placebo) were: nausea, constipation, hyperhidrosis, heart rate increased, erectile dysfunction, tachycardia, vomiting, and palpitations.
Table 3 shows the incidence of adverse reactions that occurred in ≥ 2% of FETZIMA-treated MDD patients and at least twice the rate of placebo in the placebo-controlled studies.
Table 3 Adverse Reactions Occurring in ≥ 2% of FETZIMA-treated Patients and at Least Twice the rate of Placebo-treated Patients
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System Organ Class Preferred Term | Placebo (N =1040) % | FETZIMA 40-120 mg/d (N = 1583) % |
| Gastrointestinal disorders |
| Nausea
| 6
| 17
|
| Constipation
| 3
| 9
|
| Vomiting
| 1
| 5
|
| Cardiac disorders |
| Tachycardiaa | 2
| 6
|
| Palpitations
| 1
| 5
|
| Reproductive system and breast disordersb |
| Erectile dysfunctionc | 1
| 6
|
| Testicular paind | <1
| 4
|
| Ejaculation disordere | <1
| 5
|
| Investigations |
| Heart rate increasedf | 1
| 6
|
| Blood pressure increasedg | 1
| 3
|
| Renal and urinary disorders |
| Urinary hesitation
| 0
| 4
|
| Skin and subcutaneous tissue disorders |
| Hyperhidrosis
| 2
| 9
|
| Rashh | 0
| 2
|
| Vascular disorders |
| Hot flush
| 1
| 3
|
| Hypotensioni | 1
| 3
|
| Hypertensionj | 1
| 3
|
| Metabolism and nutrition disorders |
| Decreased appetite
| 1
| 3
|
Dose-related adverse reactions
In pooled data from the short-term placebo-controlled fixed-dose studies, there were no dose-related adverse reactions (greater than 2% overall incidence) in patients treated with FETZIMA across the dose range 40-120 mg once daily, with the exception of erectile dysfunction and urinary hesitation (see Table 4).
Table 4 Dose-Related Adverse Reactions
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System Organ Class Preferred Term | Placebo (N = 362) % | FETZIMA |
40 mg/d (N = 366) % | 80 mg/d (N = 367) % | 120 mg/d (N = 180) % |
| Urinary hesitation
| 0
| 4
| 5
| 6
|
| Erectile dysfunctiona | 2
| 6
| 8
| 10
|
Other adverse reactions observed in clinical studies
Other infrequent adverse reactions, not described elsewhere in the label, occurring at an incidence of < 2% in MDD patients treated with FETZIMA were:
Cardiac disorders: Angina pectoris; Supraventricular and Ventricular extrasystoles
Eye disorders: Dry eye; Vision blurred; Conjunctival hemorrhage
General disorders: Chest pain; Thirst
Gastrointestinal disorders: Abdominal pain; Flatulence
Investigations disorders: Blood cholesterol increased; Liver function test abnormal
Nervous System disorders: Migraine; Paraesthesia; Syncope; Extrapyramidal disorder
Psychiatric disorders: Agitation; Anger; Bruxism; Panic attack; Tension; Aggression
Renal and Urinary disorder: Pollakiuria; Hematuria; Proteinuria
Respiratory, thoracic and mediastinal disorders: Yawning
Skin and subcutaneous tissue disorders: Dry skin; Pruritus; Urticaria
Alcohol
In an in vitro study, alcohol interacted with the extended-release properties of FETZIMA. If FETZIMA is taken with alcohol, a pronounced accelerated drug release may occur. It is recommended that FETZIMA extended-release capsules not be taken with alcohol.
Risk Summary
There are no adequate and well-controlled studies of FETZIMA in pregnant women. Neonates exposed to dual reuptake inhibitors of serotonin and norepinephrine (such as FETZIMA), or selective serotonin reuptake inhibitors late in the third trimester have developed complications that can arise immediately upon delivery. Levomilnacipran was not teratogenic in rats or rabbits when given during the period of organogenesis at doses up to 8 or 16 times the maximum recommended human dose (MRHD) of 120 mg on a mg/m2 basis, respectively. However, an increase in early post natal rat pup mortality was seen at a dose equivalent to 5 times the MRHD given during pregnancy and lactation. FETZIMA should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Clinical Considerations
Neonates exposed to SSRIs or SNRIs, late in the third trimester have developed complications requiring prolonged hospitalization, respiratory support, and tube feeding. Such complications can arise immediately upon delivery. Reported clinical findings have included respiratory distress, cyanosis, apnea, seizures, temperature instability, feeding difficulty, vomiting, hypoglycemia, hypotonia, hypertonia, hyperreflexia, tremor, jitteriness, irritability, and constant crying. These features are consistent with either a direct toxic effect of these classes of drugs or, possibly, a drug discontinuation syndrome. It should be noted that, in some cases, the clinical picture is consistent with serotonin syndrome [see Warnings and Precautions (5.2)].
A prospective longitudinal study of 201 women with history of major depression who were euthymic at the beginning of pregnancy, showed women who discontinued antidepressant medication during pregnancy were more likely to experience a relapse of major depression than women who continued antidepressant medication.
Animal Data
No teratogenic effects were observed when levomilnacipran was administered to pregnant rats or rabbits during the period of organogenesis at oral doses up to 100 mg/kg/day. This dose is 8 and 16 times (in rats and rabbits, respectively) the maximum recommended human dose (MRHD) of 120 mg on a mg/m2 basis. Fetal body weights were reduced in rats, and skeletal ossification was delayed in both rats and rabbits at this dose; these effects were not observed in either species at doses up to 30 mg/kg/day, 2.4 times the MRHD in rats or 5 times the MRHD in rabbits.
When levomilnacipran was administered to pregnant rats at an oral dose of 60 mg/kg/day, 5 times the MRHD, during organogenesis and throughout pregnancy and lactation, there was an increase in early postnatal pup mortality; no pup mortality was seen at 20 mg/kg/day, 1.6 times the MRHD. Among the surviving pups, pre- and post-weaning pup weight gain was reduced up to at least 8 weeks of age; however, physical and functional development, including reproductive performance of the progeny, was not affected. The effects on body weight gain were not seen at 7 mg/kg/day, 0.6 times the MRHD.
Cardiovascular Electrophysiology
At a dose 2.5 times the maximum recommended dose, levomilnacipran does not prolong QTc to any clinically relevant extent.
Absorption
The relative bioavailability of levomilnacipran after administration of FETZIMA ER was 92% when compared to oral solution. Levomilnacipran concentration was not significantly affected when FETZIMA was administered with food.
The median time to peak concentration (Tmax) of levomilnacipran is 6-8 hours after oral administration.
Distribution
Levomilnacipran is widely distributed with an apparent volume of distribution of 387-473 L; plasma protein binding is 22% over concentration range of 10 to 1000 ng/mL.
Metabolism
Levomilnacipran undergoes desethylation to form desethyl levomilnacipran and hydroxylation to form p-hydroxy-levomilnacipran. Both oxidative metabolites undergo further conjugation with glucuronide to form conjugates. The desethylation is catalyzed primarily by CYP3A4 with minor contribution by CYP2C8, 2C19, 2D6, and 2J2 [see Drug Interactions (7.4, 7.5)].
Elimination/Excretion
Levomilnacipran and its metabolites are eliminated primarily by renal excretion. Following oral administration of 14C-levomilnacipran solution, approximately 58% of the dose is excreted in urine as unchanged levomilnacipran. N-desethyl levomilnacipran is the major metabolite excreted in the urine and accounted for approximately 18% of the dose. Other identifiable metabolites excreted in the urine are levomilnacipran glucuronide (4%), desethyl levomilnacipran glucuronide (3%), p-hydroxy levomilnacipran glucuronide (1%), and p-hydroxy levomilnacipran (1%). The metabolites are inactive [see Dosage and Administration (2.3)].
Carcinogenesis
Levomilnacipran administered by oral gavage to rats for 2 years and Tg.rasH2 mice for 6 months did not increase the incidence of tumors in either study.
Rats received levomilnacipran at doses up to 90/70 mg/kg/day (the dose was lowered in males after 45 weeks of dosing). The 90 mg/kg/day dose is 7 times the maximum recommended human dose (MRHD) of 120 mg on a mg/m2 basis.
Tg.rasH2 mice received levomilnacipran at doses up to 150 mg/kg/day. This dose is 6 times the MRHD.
Mutagenesis
Levomilnacipran was not mutagenic in the in vitro bacterial mutation assay (Ames test) and was not clastogenic in an in vivo micronucleus assay in rats. Additionally, levomilnacipran was not genotoxic in the in vitro mouse lymphoma (L5178Y TK+/-) cell forward mutation assay.
Impairment of Fertility
When levomilnacipran was administered orally to male and female rats before mating, through mating and up to Day 7 of gestation at doses up to 100 mg/kg/day, no effects were observed on fertility. This dose is 8 times the MRHD.
Information for Patients
Advise patients, their families, and their caregivers about the benefits and risks associated with treatment with FETZIMA and counsel them on its appropriate use. Advise patients, their families, and their caregivers to read the Medication Guide and assist them in understanding its contents. The complete text of the Medication Guide is reprinted at the end of this document.
Suicide Risk
Advise patients and caregivers to look for the emergence of suicidality, especially early during treatment and when the dose is adjusted up or down [see Box Warning and Warnings and Precautions (5.1)].
Dosing and Administration
Advise patients that FETZIMA should be swallowed whole and should not be chewed, crushed or opened.
Advise patients that FETZIMA can be taken with or without food. FETZIMA should be initiated with a dose of 20 mg once daily for 2 days and then increased to 40 mg once daily. Based on efficacy and tolerability, FETZIMA may then be increased in increments of 40 mg at intervals of 2 or more days. The maximum recommended dose is 120 mg once daily.
Instruct patients if they miss a dose, to take the missed dose as soon as they remember. If it is almost time for the next dose, instruct them to skip the missed dose and take their next dose at the regular time. Advise them not to take two doses of FETZIMA at the same time.
Concomitant Medication
Instruct patients not to take FETZIMA with an MAOI or within 14 days of stopping an MAOI and to allow 7 days after stopping FETZIMA before starting an MAOI [see Contraindications (4)].
Serotonin Syndrome
Caution patients about the risk of serotonin syndrome, particularly with the concomitant use of FETZIMA and triptans, tramadol, amphetamines, tryptophan supplements, other serotonergic agents, or antipsychotic drugs [see Warnings and Precautions (5.2) and Drug Interactions (7.2)].
Effect on Blood Pressure and Heart Rate
Advise patients that they should have regular monitoring of blood pressure and heart rate when taking FETZIMA [see Warnings and Precautions (5.3, 5.4)].
Abnormal Bleeding
Caution patients about the concomitant use of FETZIMA and NSAIDs, aspirin, warfarin, or other drugs that affect coagulation since combined use of psychotropic drugs that interfere with serotonin reuptake and these agents has been associated with an increased risk of abnormal bleeding [see Warnings and Precautions (5.5)].
Angle Closure Glaucoma
Patients should be advised that taking FETZIMA can cause mild pupillary dilation, which in susceptible individuals, can lead to an episode of angle closure glaucoma. Pre-existing glaucoma is almost always open-angle glaucoma because angle closure glaucoma, when diagnosed, can be treated definitively with iridectomy. Open-angle glaucoma is not a risk factor for angle closure glaucoma. Patients may wish to be examined to determine whether they are susceptible to angle closure, and have a prophylactic procedure (e.g., iridectomy), if they are susceptible [see Warnings and Precautions (5.6)].
Urinary Hesitation or Retention
Caution patients about the risk of urinary hesitation and retention while taking FETZIMA, particularly in patients prone to obstructive urinary disorders [see Warnings and Precautions (5.7)].
Activation of Mania/Hypomania
Advise patients and their caregivers to observe for signs of activation of mania/hypomania [see Warnings and Precautions (5.8)].
Seizures
Caution patients about using FETZIMA if they have a history of a seizure disorder [see Warnings and Precautions (5.9)]. Patients with a history of seizures were excluded from clinical studies.
Discontinuation Syndrome
Advise patients not to stop taking FETZIMA without first talking with their healthcare provider. Patients should be aware that discontinuation effects may occur when suddenly stopping FETZIMA [see Warnings and Precautions (5.10)].
Hyponatremia
Advise patients that if they are treated with diuretics, or are otherwise volume depleted, or are elderly, they may be at greater risk of developing hyponatremia while taking FETZIMA [see Warnings and Precautions (5.11)].
Alcohol
Advise patients to avoid consumption of alcohol while taking FETZIMA [see Drug Interactions (7.6)].
Allergic Reactions
Advise patients to notify their healthcare provider if they develop an allergic reaction such as rash, hives, swelling, or difficulty breathing.
Pregnancy
Advise patients to notify their healthcare provider if they become pregnant or intend to become pregnant during therapy with FETZIMA [see Use in Specific Populations (8.1)].
Nursing Mothers
Advise patients to notify their healthcare provider if they are breastfeeding an infant and would like to continue or start FETZIMA [see Use in Specific Populations (8.3)].
Interference with Cognitive and Motor Performance
Caution patients about operating hazardous machinery, including automobiles, until they are reasonably certain that FETZIMA therapy does not adversely affect their ability to engage in such activities.
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