Initial Treatment
Adolescents
The recommended dose of escitalopram oral solution is 10 mg once daily. A flexible-dose trial of escitalopram oral solution (10 mg/day to 20 mg/day) demonstrated the effectiveness of escitalopram oral solution [see Clinical Studies (14.1)]. If the dose is increased to 20 mg, this should occur after a minimum of three weeks.
Adults
The recommended dose of escitalopram oral solution is 10 mg once daily. A fixed-dose trial of escitalopram oral solution demonstrated the effectiveness of both 10 mg and 20 mg of escitalopram oral solution, but failed to demonstrate a greater benefit of 20 mg over 10 mg [see Clinical Studies (14.1)]. If the dose is increased to 20 mg, this should occur after a minimum of one week.
Maintenance Treatment
It is generally agreed that acute episodes of major depressive disorder require several months or longer of sustained pharmacological therapy beyond response to the acute episode. Systematic evaluation of continuing escitalopram oral solution 10 mg/day or 20 mg/day in adult patients with major depressive disorder who responded while taking escitalopram oral solution during an 8-week, acute-treatment phase demonstrated a benefit of such maintenance treatment [see Clinical Studies (14.1)]. Nevertheless, the physician who elects to use escitalopram oral solution for extended periods should periodically reevaluate the long-term usefulness of the drug for the individual patient. Patients should be periodically reassessed to determine the need for maintenance treatment.
Initial Treatment
Adults
The recommended starting dose of escitalopram oral solution is 10 mg once daily. If the dose is increased to 20 mg, this should occur after a minimum of one week.
Maintenance Treatment
Generalized anxiety disorder is recognized as a chronic condition. The efficacy of escitalopram oral solution in the treatment of GAD beyond 8 weeks has not been systematically studied. The physician who elects to use escitalopram oral solution for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient.
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 trials) 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 escitalopram oral solution is not approved for use in treating bipolar depression.
Angle-Closure Glaucoma: The pupillary dilation that occurs following use of many antidepressant drugs including escitalopram oral solution may trigger an angle closure attack in a patient with anatomically narrow angles who does not have a patent iridectomy.
Clinical Trial Data Sources
Pediatrics (6 to 17 years)
Adverse events were collected in 576 pediatric patients (286 escitalopram oral solution, 290 placebo) with major depressive disorder in double-blind placebo-controlled studies. Safety and effectiveness of escitalopram oral solution in pediatric patients less than 12 years of age has not been established.
Adults
Adverse events information for escitalopram oral solution was collected from 715 patients with major depressive disorder who were exposed to escitalopram and from 592 patients who were exposed to placebo in double-blind, placebo-controlled trials. An additional 284 patients with major depressive disorder were newly exposed to escitalopram in open-label trials. The adverse event information for escitalopram oral solution in patients with GAD was collected from 429 patients exposed to escitalopram and from 427 patients exposed to placebo in double-blind, placebo-controlled trials.
Adverse events during exposure were obtained primarily by general inquiry and recorded by clinical investigators using terminology of their own choosing. Consequently, it is not possible to provide a meaningful estimate of the proportion of individuals experiencing adverse events without first grouping similar types of events into a smaller number of standardized event categories. In the tables and tabulations that follow, standard World Health Organization (WHO) terminology has been used to classify reported adverse events.
The stated frequencies of adverse reactions represent the proportion of individuals who experienced, at least once, a treatment-emergent adverse event of the type listed. An event was considered treatment-emergent if it occurred for the first time or worsened while receiving therapy following baseline evaluation.
Adverse Events Associated with Discontinuation of Treatment
Major Depressive Disorder
Pediatrics (6 to 17 years)
Adverse events were associated with discontinuation of 3.5% of 286 patients receiving escitalopram oral solution and 1% of 290 patients receiving placebo. The most common adverse event (incidence at least 1% for escitalopram oral solution and greater than placebo) associated with discontinuation was insomnia (1% escitalopram oral solution, 0% placebo).
Adults
Among the 715 depressed patients who received escitalopram oral solution in placebo-controlled trials, 6% discontinued treatment due to an adverse event, as compared to 2% of 592 patients receiving placebo. In two fixed-dose studies, the rate of discontinuation for adverse events in patients receiving 10 mg/day escitalopram oral solution was not significantly different from the rate of discontinuation for adverse events in patients receiving placebo. The rate of discontinuation for adverse events in patients assigned to a fixed dose of 20 mg/day escitalopram oral solution was 10%, which was significantly different from the rate of discontinuation for adverse events in patients receiving 10 mg/day escitalopram oral solution (4%) and placebo (3%). Adverse events that were associated with the discontinuation of at least 1% of patients treated with escitalopram oral solution, and for which the rate was at least twice that of placebo, were nausea (2%) and ejaculation disorder (2% of male patients).
Generalized Anxiety Disorder
Adults
Among the 429 GAD patients who received escitalopram oral solution 10 mg/day to 20 mg/day in placebo-controlled trials, 8% discontinued treatment due to an adverse event, as compared to 4% of 427 patients receiving placebo. Adverse events that were associated with the discontinuation of at least 1% of patients treated with escitalopram oral solution, and for which the rate was at least twice the placebo rate, were nausea (2%), insomnia (1%), and fatigue (1%).
Incidence of Adverse Reactions in Placebo-Controlled Clinical Trials
Major Depressive Disorder
Pediatrics (6 to 17 years)
The overall profile of adverse reactions in pediatric patients was generally similar to that seen in adult studies, as shown in Table 2. However, the following adverse reactions (excluding those which appear in Table 2 and those for which the coded terms were uninformative or misleading) were reported at an incidence of at least 2% for escitalopram oral solution and greater than placebo: back pain, urinary tract infection, vomiting, and nasal congestion.
Adults
The most commonly observed adverse reactions in escitalopram oral solution patients (incidence of approximately 5% or greater and approximately twice the incidence in placebo patients) were insomnia, ejaculation disorder (primarily ejaculatory delay), nausea, sweating increased, fatigue, and somnolence.
Table 2 enumerates the incidence, rounded to the nearest percent, of treatment-emergent adverse events that occurred among 715 depressed patients who received escitalopram oral solution at doses ranging from 10 mg/day to 20 mg/day in placebo-controlled trials. Events included are those occurring in 2% or more of patients treated with escitalopram oral solution and for which the incidence in patients treated with escitalopram oral solution was greater than the incidence in placebo-treated patients.
TABLE 2 Treatment-Emergent Adverse Reactions observed with a frequency of ≥ 2% and greater than placebo for Major Depressive Disorder| Adverse Reaction | Escitalopram (N=715) % | Placebo (N=592) % |
|---|
| Autonomic Nervous System Disorders |
| Dry Mouth | 6% | 5% |
| Sweating Increased | 5% | 2% |
| Central & Peripheral Nervous System Disorders |
| Dizziness | 5% | 3% |
| Gastrointestinal Disorders |
| Nausea | 15% | 7% |
| Diarrhea | 8% | 5% |
| Constipation | 3% | 1% |
| Indigestion | 3% | 1% |
| Abdominal Pain | 2% | 1% |
| General |
| Influenza-like Symptoms | 5% | 4% |
| Fatigue | 5% | 2% |
| Psychiatric Disorders |
| Insomnia | 9% | 4% |
| Somnolence | 6% | 2% |
| Appetite Decreased | 3% | 1% |
| Libido Decreased | 3% | 1% |
| Respiratory System Disorders |
| Rhinitis | 5% | 4% |
| Sinusitis | 3% | 2% |
| Urogenital |
| Ejaculation Disorder Primarily ejaculatory delay. ,Denominator used was for males only (N=225 escitalopram oral solution; N=188 placebo). | 9% | <1% |
| Impotence | 3% | <1% |
| Anorgasmia Denominator used was for females only (N=490 escitalopram oral solution; N=404 placebo). | 2% | <1% |
Generalized Anxiety Disorder
Adults
The most commonly observed adverse reactions in escitalopram oral solution patients (incidence of approximately 5% or greater and approximately twice the incidence in placebo patients) were nausea, ejaculation disorder (primarily ejaculatory delay), insomnia, fatigue, decreased libido, and anorgasmia.
Table 3 enumerates the incidence, rounded to the nearest percent of treatment-emergent adverse events that occurred among 429 GAD patients who received escitalopram oral solution 10 mg/day to 20 mg/day in placebo-controlled trials. Events included are those occurring in 2% or more of patients treated with escitalopram oral solution and for which the incidence in patients treated with escitalopram oral solution was greater than the incidence in placebo-treated patients.
TABLE 3 Treatment-Emergent Adverse Reactions observed with a frequency of ≥ 2% and greater than placebo for Generalized Anxiety Disorder| Adverse Reactions | Escitalopram (N=429) % | Placebo (N=427) % |
|---|
| Autonomic Nervous System Disorders |
| Dry Mouth | 9% | 5% |
| Sweating Increased | 4% | 1% |
| Central & Peripheral Nervous System Disorders |
| Headache | 24% | 17% |
| Paresthesia | 2% | 1% |
| Gastrointestinal Disorders |
| Nausea | 18% | 8% |
| Diarrhea | 8% | 6% |
| Constipation | 5% | 4% |
| Indigestion | 3% | 2% |
| Vomiting | 3% | 1% |
| Abdominal Pain | 2% | 1% |
| Flatulence | 2% | 1% |
| Toothache | 2% | 0% |
| General |
| Fatigue | 8% | 2% |
| Influenza-like Symptoms | 5% | 4% |
| Musculoskeletal System Disorder |
| Neck/Shoulder Pain | 3% | 1% |
| Psychiatric Disorders |
| Somnolence | 13% | 7% |
| Insomnia | 12% | 6% |
| Libido Decreased | 7% | 2% |
| Dreaming Abnormal | 3% | 2% |
| Appetite Decreased | 3% | 1% |
| Lethargy | 3% | 1% |
| Respiratory System Disorders |
| Yawning | 2% | 1% |
| Urogenital |
| Ejaculation Disorder Primarily ejaculatory delay. ,Denominator used was for males only (N=182 escitalopram oral solution; N=195 placebo). | 14% | 2% |
| Anorgasmia Denominator used was for females only (N=247 escitalopram oral solution; N=232 placebo). | 6% | <1% |
| Menstrual Disorder | 2% | 1% |
Dose Dependency of Adverse Reactions
The potential dose dependency of common adverse reactions (defined as an incidence rate of ≥5% in either the 10 mg or 20 mg escitalopram oral solution groups) was examined on the basis of the combined incidence of adverse reactions in two fixed-dose trials. The overall incidence rates of adverse events in 10 mg escitalopram oral solution-treated patients (66%) was similar to that of the placebo-treated patients (61%), while the incidence rate in 20 mg/day escitalopram oral solution-treated patients was greater (86%). Table 4 shows common adverse reactions that occurred in the 20 mg/day escitalopram oral solution group with an incidence that was approximately twice that of the 10 mg/day escitalopram oral solution group and approximately twice that of the placebo group.
TABLE 4 Incidence of Common Adverse Reactions in Patients with Major Depressive Disorder| Adverse Reaction | Placebo | 10 mg/day | 20 mg/day |
|---|
| (N=311) | Escitalopram | Escitalopram |
|---|
| | (N=310) | (N=125) |
|---|
| Insomnia | 4% | 7% | 14% |
| Diarrhea | 5% | 6% | 14% |
| Dry Mouth | 3% | 4% | 9% |
| Somnolence | 1% | 4% | 9% |
| Dizziness | 2% | 4% | 7% |
| Sweating Increased | <1% | 3% | 8% |
| Constipation | 1% | 3% | 6% |
| Fatigue | 2% | 2% | 6% |
| Indigestion | 1% | 2% | 6% |
Male and Female Sexual Dysfunction with SSRIs
Although changes in sexual desire, sexual performance, and sexual satisfaction often occur as manifestations of a psychiatric disorder, they may also be a consequence of pharmacologic treatment. In particular, some evidence suggests that SSRIs can cause such untoward sexual experiences.
Reliable estimates of the incidence and severity of untoward experiences involving sexual desire, performance, and satisfaction are difficult to obtain, however, in part because patients and physicians may be reluctant to discuss them. Accordingly, estimates of the incidence of untoward sexual experience and performance cited in product labeling are likely to underestimate their actual incidence.
TABLE 5 Incidence of Sexual Side Effects in Placebo-Controlled Clinical Trials| Adverse Event | Escitalopram | Placebo |
|---|
| In Males Only |
| (N=407) | (N=383) |
Ejaculation Disorder (primarily ejaculatory delay) | 12% | 1% |
| Libido Decreased | 6% | 2% |
| Impotence | 2% | <1% |
| In Females Only |
| (N=737) | (N=636) |
| Libido Decreased | 3% | 1% |
| Anorgasmia | 3% | <1% |
There are no adequately designed studies examining sexual dysfunction with escitalopram treatment.
Priapism has been reported with all SSRIs.
While it is difficult to know the precise risk of sexual dysfunction associated with the use of SSRIs, physicians should routinely inquire about such possible side effects.
Vital Sign Changes
Escitalopram oral solution and placebo groups were compared with respect to (1) mean change from baseline in vital signs (pulse, systolic blood pressure, and diastolic blood pressure) and (2) the incidence of patients meeting criteria for potentially clinically significant changes from baseline in these variables. These analyses did not reveal any clinically important changes in vital signs associated with escitalopram oral solution treatment. In addition, a comparison of supine and standing vital sign measures in subjects receiving escitalopram oral solution indicated that escitalopram oral solution treatment is not associated with orthostatic changes.
Weight Changes
Patients treated with escitalopram oral solution in controlled trials did not differ from placebo-treated patients with regard to clinically important change in body weight.
Laboratory Changes
Escitalopram oral solution and placebo groups were compared with respect to (1) mean change from baseline in various serum chemistry, hematology, and urinalysis variables, and (2) the incidence of patients meeting criteria for potentially clinically significant changes from baseline in these variables. These analyses revealed no clinically important changes in laboratory test parameters associated with escitalopram oral solution treatment.
ECG Changes
Electrocardiograms from escitalopram oral solution (N=625) and placebo (N=527) groups were compared with respect to outliers defined as subjects with QTc changes over 60 msec from baseline or absolute values over 500 msec post-dose, and subjects with heart rate increases to over 100 bpm or decreases to less than 50 bpm with a 25% change from baseline (tachycardic or bradycardic outliers, respectively). None of the patients in the escitalopram oral solution group had a QTcF interval >500 msec or a prolongation >60 msec compared to 0.2% of patients in the placebo group. The incidence of tachycardic outliers was 0.2% in the escitalopram oral solution and the placebo group. The incidence of bradycardic outliers was 0.5% in the escitalopram oral solution group and 0.2% in the placebo group.
QTcF interval was evaluated in a randomized, placebo and active (moxifloxacin 400 mg) controlled cross-over, escalating multiple-dose study in 113 healthy subjects. The maximum mean (95% upper confidence bound) difference from placebo arm were 4.5 (6.4) and 10.7 (12.7) msec for 10 mg and supratherapeutic 30 mg escitalopram given once daily, respectively. Based on the established exposure-response relationship, the predicted QTcF change from placebo arm (95% confidence interval) under the Cmax for the dose of 20 mg is 6.6 (7.9) msec. Escitalopram 30 mg given once daily resulted in mean Cmax of 1.7-fold higher than the mean Cmax for the maximum recommended therapeutic dose at steady state (20 mg). The exposure under supratherapeutic 30 mg dose is similar to the steady state concentrations expected in CYP2C19 poor metabolizers following a therapeutic dose of 20 mg.
Other Reactions Observed During the Premarketing Evaluation of Escitalopram Oral Solution
Following is a list of treatment-emergent adverse events, as defined in the introduction to the ADVERSE REACTIONS section, reported by the 1428 patients treated with escitalopram oral solution for periods of up to one year in double-blind or open-label clinical trials during its premarketing evaluation. The listing does not include those events already listed in Tables 2 & 3, those events for which a drug cause was remote and at a rate less than 1% or lower than placebo, those events which were so general as to be uninformative, and those events reported only once which did not have a substantial probability of being acutely life threatening. Events are categorized by body system. Events of major clinical importance are described in the Warnings and Precautions section (5).
Cardiovascular - hypertension, palpitation.
Central and Peripheral Nervous System Disorders - light-headed feeling, migraine.
Gastrointestinal Disorders - abdominal cramp, heartburn, gastroenteritis.
General - allergy, chest pain, fever, hot flushes, pain in limb.
Metabolic and Nutritional Disorders - increased weight.
Musculoskeletal System Disorders - arthralgia, myalgia jaw stiffness.
Psychiatric Disorders - appetite increased, concentration impaired, irritability.
Reproductive Disorders/Female - menstrual cramps, menstrual disorder.
Respiratory System Disorders - bronchitis, coughing, nasal congestion, sinus congestion, sinus headache.
Skin and Appendages Disorders - rash.
Special Senses - vision blurred, tinnitus.
Urinary System Disorders - urinary frequency, urinary tract infection.
Adverse Reactions Reported Subsequent to the Marketing of Escitalopram
The following additional adverse reactions have been identified from spontaneous reports of escitalopram received worldwide. These adverse reactions have been chosen for inclusion because of a combination of seriousness, frequency of reporting, or potential causal connection to escitalopram and have not been listed elsewhere in labeling. However, because these adverse reactions were 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. These events include:
Blood and Lymphatic System Disorders: anemia, agranulocytis, aplastic anemia, hemolytic anemia, idiopathic thrombocytopenia purpura, leukopenia, thrombocytopenia.
Cardiac Disorders: atrial fibrillation, bradycardia, cardiac failure, myocardial infarction, tachycardia, torsade de pointes, ventricular arrhythmia, ventricular tachycardia.
Ear and labyrinth disorders: vertigo
Endocrine Disorders: diabetes mellitus, hyperprolactinemia, SIADH.
Eye Disorders: angle closure glaucoma, diplopia, mydriasis, visual disturbance.
Gastrointestinal Disorder: dysphagia, gastrointestinal hemorrhage, gastroesophageal reflux, pancreatitis, rectal hemorrhage.
General Disorders and Administration Site Conditions: abnormal gait, asthenia, edema, fall, feeling abnormal, malaise.
Hepatobiliary Disorders: fulminant hepatitis, hepatic failure, hepatic necrosis, hepatitis.
Immune System Disorders: allergic reaction, anaphylaxis.
Investigations: bilirubin increased, decreased weight, electrocardiogram QT prolongation, hepatic enzymes increased, hypercholesterolemia, INR increased, prothrombin decreased.
Metabolism and Nutrition Disorders: hyperglycemia, hypoglycemia, hypokalemia, hyponatremia.
Musculoskeletal and Connective Tissue Disorders: muscle cramp, muscle stiffness, muscle weakness, rhabdomyolysis.
Nervous System Disorders: akathisia, amnesia, ataxia, choreoathetosis, cerebrovascular accident, dysarthria, dyskinesia, dystonia, extrapyramidal disorders, grand mal seizures (or convulsions), hypoaesthesia, myoclonus, nystagmus, Parkinsonism, restless legs, seizures, syncope, tardive dyskinesia, tremor.
Pregnancy, Puerperium and Perinatal Conditions: spontaneous abortion.
Psychiatric Disorders: acute psychosis, aggression, agitation, anger, anxiety, apathy, completed suicide, confusion, depersonalization, depression aggravated, delirium, delusion, disorientation, feeling unreal, hallucinations (visual and auditory), mood swings, nervousness, nightmare, panic reaction, paranoia, restlessness, self-harm or thoughts of self-harm, suicide attempt, suicidal ideation, suicidal tendency.
Renal and Urinary Disorders: acute renal failure, dysuria, urinary retention.
Reproductive System and Breast Disorders: menorrhagia, priapism.
Respiratory, Thoracic and Mediastinal Disorders: dyspnea, epistaxis, pulmonary embolism, pulmonary hypertension of the newborn.
Skin and Subcutaneous Tissue Disorders: alopecia, angioedema, dermatitis, ecchymosis, erythema multiforme, photosensitivity reaction, Stevens Johnson Syndrome, toxic epidermal necrolysis, urticaria.
Vascular Disorders: deep vein thrombosis, flushing, hypertensive crisis, hypotension, orthostatic hypotension, phlebitis, thrombosis.
Physical and Psychological Dependence
Animal studies suggest that the abuse liability of racemic citalopram is low. Escitalopram oral solution has not been systematically studied in humans for its potential for abuse, tolerance, or physical dependence. The premarketing clinical experience with escitalopram oral solution did not reveal any drug-seeking behavior. However, these observations were not systematic and it is not possible to predict on the basis of this limited experience the extent to which a CNS-active drug will be misused, diverted, and/or abused once marketed. Consequently, physicians should carefully evaluate escitalopram oral solution patients for history of drug abuse and follow such patients closely, observing them for signs of misuse or abuse (e.g., development of tolerance, incrementations of dose, drug-seeking behavior).
Absorption and Distribution
Following a single oral dose (20 mg tablet or solution) of escitalopram, peak blood levels occur at about 5 hours. Absorption of escitalopram is not affected by food.
The absolute bioavailability of citalopram is about 80% relative to an intravenous dose, and the volume of distribution of citalopram is about 12 L/kg. Data specific on escitalopram are unavailable.
The binding of escitalopram to human plasma proteins is approximately 56%.
Metabolism and Elimination
Following oral administrations of escitalopram, the fraction of drug recovered in the urine as escitalopram and S-demethylcitalopram (S-DCT) is about 8% and 10%, respectively. The oral clearance of escitalopram is 600 mL/min, with approximately 7% of that due to renal clearance.
Escitalopram is metabolized to S-DCT and S-didemethylcitalopram (S-DDCT). In humans, unchanged escitalopram is the predominant compound in plasma. At steady state, the concentration of the escitalopram metabolite S-DCT in plasma is approximately one-third that of escitalopram. The level of S-DDCT was not detectable in most subjects. In vitro studies show that escitalopram is at least 7 and 27 times more potent than S-DCT and S-DDCT, respectively, in the inhibition of serotonin reuptake, suggesting that the metabolites of escitalopram do not contribute significantly to the antidepressant actions of escitalopram. S-DCT and S-DDCT also have no or very low affinity for serotonergic (5-HT1-7) or other receptors including alpha- and beta-adrenergic, dopamine (D1-5), histamine (H1-3), muscarinic (M1-5), and benzodiazepine receptors. S-DCT and S-DDCT also do not bind to various ion channels including Na+, K+, Cl-, and Ca++ channels.
In vitro studies using human liver microsomes indicated that CYP3A4 and CYP2C19 are the primary isozymes involved in the N-demethylation of escitalopram.
Population Subgroups
Age
Adolescents - In a single dose study of 10 mg escitalopram, AUC of escitalopram decreased by 19%, and Cmax increased by 26% in healthy adolescent subjects (12 to 17 years of age) compared to adults. Following multiple dosing of 40 mg/day citalopram, escitalopram elimination half-life, steady-state Cmax and AUC were similar in patients with MDD (12 to 17 years of age) compared to adult patients. No adjustment of dosage is needed in adolescent patients.
Elderly - Escitalopram pharmacokinetics in subjects ≥ 65 years of age were compared to younger subjects in a single-dose and a multiple-dose study. Escitalopram AUC and half-life were increased by approximately 50% in elderly subjects, and Cmax was unchanged. 10 mg is the recommended dose for elderly patients [see Dosage and Administration (2.3)].
Gender - Based on data from single- and multiple-dose studies measuring escitalopram in elderly, young adults, and adolescents, no dosage adjustment on the basis of gender is needed.
Reduced hepatic function - Citalopram oral clearance was reduced by 37% and half-life was doubled in patients with reduced hepatic function compared to normal subjects. 10 mg is the recommended dose of escitalopram for most hepatically impaired patients [see Dosage and Administration (2.3)].
Reduced renal function - In patients with mild to moderate renal function impairment, oral clearance of citalopram was reduced by 17% compared to normal subjects. No adjustment of dosage for such patients is recommended. No information is available about the pharmacokinetics of escitalopram in patients with severely reduced renal function (creatinine clearance < 20 mL/min).
Drug-Drug Interactions
In vitro enzyme inhibition data did not reveal an inhibitory effect of escitalopram on CYP3A4, -1A2, -2C9, -2C19, and -2E1. Based on in vitro data, escitalopram would be expected to have little inhibitory effect on in vivo metabolism mediated by these cytochromes. While in vivo data to address this question are limited, results from drug interaction studies suggest that escitalopram, at a dose of 20 mg, has no 3A4 inhibitory effect and a modest 2D6 inhibitory effect. See Drug Interactions (7.18) for more detailed information on available drug interaction data.
Carcinogenesis
Racemic citalopram was administered in the diet to NMRI/BOM strain mice and COBS WI strain rats for 18 and 24 months, respectively. There was no evidence for carcinogenicity of racemic citalopram in mice receiving up to 240 mg/kg/day. There was an increased incidence of small intestine carcinoma in rats receiving 8 mg/kg/day or 24 mg/kg/day racemic citalopram. A no-effect dose for this finding was not established. The relevance of these findings to humans is unknown.
Mutagenesis
Racemic citalopram was mutagenic in the in vitro bacterial reverse mutation assay (Ames test) in 2 of 5 bacterial strains (Salmonella TA98 and TA1537) in the absence of metabolic activation. It was clastogenic in the in vitro Chinese hamster lung cell assay for chromosomal aberrations in the presence and absence of metabolic activation. Racemic citalopram was not mutagenic in the in vitro mammalian forward gene mutation assay (HPRT) in mouse lymphoma cells or in a coupled in vitro/in vivo unscheduled DNA synthesis (UDS) assay in rat liver. It was not clastogenic in the in vitro chromosomal aberration assay in human lymphocytes or in two in vivo mouse micronucleus assays.
Impairment of Fertility
When racemic citalopram was administered orally to 16 male and 24 female rats prior to and throughout mating and gestation at doses of 32 mg/kg/day, 48 mg/kg/day, and 72 mg/kg/day, mating was decreased at all doses, and fertility was decreased at doses ≥ 32 mg/kg/day. Gestation duration was increased at 48 mg/kg/day.
Retinal Changes in Rats
Pathologic changes (degeneration/atrophy) were observed in the retinas of albino rats in the 2-year carcinogenicity study with racemic citalopram. There was an increase in both incidence and severity of retinal pathology in both male and female rats receiving 80 mg/kg/day. Similar findings were not present in rats receiving 24 mg/kg/day of racemic citalopram for two years, in mice receiving up to 240 mg/kg/day of racemic citalopram for 18 months, or in dogs receiving up to 20 mg/kg/day of racemic citalopram for one year.
Additional studies to investigate the mechanism for this pathology have not been performed, and the potential significance of this effect in humans has not been established.
Cardiovascular Changes in Dogs
In a one-year toxicology study, 5 of 10 beagle dogs receiving oral racemic citalopram doses of 8 mg/kg/day died suddenly between weeks 17 and 31 following initiation of treatment. Sudden deaths were not observed in rats at doses of racemic citalopram up to 120 mg/kg/day, which produced plasma levels of citalopram and its metabolites demethylcitalopram and didemethylcitalopram (DDCT) similar to those observed in dogs at 8 mg/kg/day. A subsequent intravenous dosing study demonstrated that in beagle dogs, racemic DDCT caused QT prolongation, a known risk factor for the observed outcome in dogs.
Adolescents
The efficacy of escitalopram oral solution as an acute treatment for major depressive disorder in adolescent patients was established in an 8-week, flexible-dose, placebo-controlled study that compared escitalopram oral solution 10 mg/day to 20 mg/day to placebo in outpatients 12 to 17 years of age inclusive who met DSM-IV criteria for major depressive disorder. The primary outcome was change from baseline to endpoint in the Children's Depression Rating Scale - Revised (CDRS-R). In this study, escitalopram oral solution showed statistically significant greater mean improvement compared to placebo on the CDRS-R.
The efficacy of escitalopram oral solution in the acute treatment of major depressive disorder in adolescents was established, in part, on the basis of extrapolation from the 8-week, flexible-dose, placebo-controlled study with racemic citalopram 20 to 40 mg/day. In this outpatient study in children and adolescents 7 to 17 years of age who met DSM-IV criteria for major depressive disorder, citalopram treatment showed statistically significant greater mean improvement from baseline, compared to placebo, on the CDRS-R; the positive results for this trial largely came from the adolescent subgroup.
Two additional flexible-dose, placebo-controlled MDD studies (one escitalopram oral solution study in patients ages 7 to 17 and one citalopram study in adolescents) did not demonstrate efficacy.
Although maintenance efficacy in adolescent patients has not been systematically evaluated, maintenance efficacy can be extrapolated from adult data along with comparisons of escitalopram pharmacokinetic parameters in adults and adolescent patients.
Adults
The efficacy of escitalopram oral solution as a treatment for major depressive disorder was established in three, 8-week, placebo-controlled studies conducted in outpatients between 18 and 65 years of age who met DSM-IV criteria for major depressive disorder. The primary outcome in all three studies was change from baseline to endpoint in the Montgomery Asberg Depression Rating Scale (MADRS).
A fixed-dose study compared 10 mg/day escitalopram oral solution and 20 mg/day escitalopram oral solution to placebo and 40 mg/day citalopram. The 10 mg/day and 20 mg/day escitalopram oral solution treatment groups showed statistically significant greater mean improvement compared to placebo on the MADRS. The 10 mg and 20 mg escitalopram oral solution groups were similar on this outcome measure.
In a second fixed-dose study of 10 mg/day escitalopram oral solution and placebo, the 10 mg/day escitalopram oral solution treatment group showed statistically significant greater mean improvement compared to placebo on the MADRS.
In a flexible-dose study, comparing escitalopram oral solution, titrated between 10 mg/day and 20 mg/day, to placebo and citalopram, titrated between 20 mg/day and 40 mg/day, the escitalopram oral solution treatment group showed statistically significant greater mean improvement compared to placebo on the MADRS.
Analyses of the relationship between treatment outcome and age, gender, and race did not suggest any differential responsiveness on the basis of these patient characteristics.
In a longer-term trial, 274 patients meeting (DSM-IV) criteria for major depressive disorder, who had responded during an initial 8-week, open-label treatment phase with escitalopram oral solution 10 mg/day or 20 mg/day, were randomized to continuation of escitalopram oral solution at their same dose, or to placebo, for up to 36 weeks of observation for relapse. Response during the open-label phase was defined by having a decrease of the MADRS total score to ≤ 12. Relapse during the double-blind phase was defined as an increase of the MADRS total score to ≥ 22, or discontinuation due to insufficient clinical response. Patients receiving continued escitalopram oral solution experienced a statistically significant longer time to relapse compared to those receiving placebo.
General Information about Medication Guide
Prescribers or other health professionals should inform patients, their families, and their caregivers about the benefits and risks associated with treatment with escitalopram oral solution and should counsel them in its appropriate use. A patient Medication Guide about "Antidepressant Medicines, Depression and other Serious Mental Illness, and Suicidal Thoughts or Actions" is available for escitalopram oral solution. The prescriber or health professional should instruct patients, their families, and their caregivers to read the Medication Guide and should assist them in understanding its contents. Patients should be given the opportunity to discuss the contents of the Medication Guide and to obtain answers to any questions they may have. The complete text of the Medication Guide is reprinted at the end of this document.
Patients should be advised of the following issues and asked to alert their prescriber if these occur while taking escitalopram oral solution.
Clinical Worsening and Suicide Risk
Patients, their families, and their caregivers should be encouraged to be alert to the emergence of anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, mania, other unusual changes in behavior, worsening of depression, and suicidal ideation, especially early during antidepressant treatment and when the dose is adjusted up or down. Families and caregivers of patients should be advised to look for the emergence of such symptoms on a day-to-day basis, since changes may be abrupt. Such symptoms should be reported to the patient's prescriber or health professional, especially if they are severe, abrupt in onset, or were not part of the patient's presenting symptoms. Symptoms such as these may be associated with an increased risk for suicidal thinking and behavior and indicate a need for very close monitoring and possibly changes in the medication [see Warnings and Precautions (5.1)].
Serotonin Syndrome
Patients should be cautioned about the risk of serotonin syndrome with the concomitant use of escitalopram oral solution with other serotonergic drugs including triptans, tricyclic antidepressants, fentanyl, lithium, tramadol, tryptophan, buspirone, amphetamines and St. John's Wort, and with drugs that impair metabolism of serotonin (in particular, MAOIs, both those intended to treat psychiatric disorders and also others, such as linezolid) [see Warnings and Precautions (5.2)].
Abnormal Bleeding
Patients should be cautioned about the concomitant use of escitalopram oral solution 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 bleeding [see Warnings and Precautions (5.7)].
Angle Closure Glaucoma
Patients should be advised that taking escitalopram oral solution 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 (5.9)].
Concomitant Medications
Since escitalopram is the active isomer of racemic citalopram (Celexa), the two agents should not be coadministered. Patients should be advised to inform their physician if they are taking, or plan to take, any prescription or over-the-counter drugs, as there is a potential for interactions.
Continuing the Therapy Prescribed
While patients may notice improvement with escitalopram oral solution therapy in 1 to 4 weeks, they should be advised to continue therapy as directed.
Interference with Psychomotor Performance
Because psychoactive drugs may impair judgment, thinking, or motor skills, patients should be cautioned about operating hazardous machinery, including automobiles, until they are reasonably certain that escitalopram oral solution therapy does not affect their ability to engage in such activities.
Alcohol
Patients should be told that, although escitalopram oral solution has not been shown in experiments with normal subjects to increase the mental and motor skill impairments caused by alcohol, the concomitant use of escitalopram oral solution and alcohol in depressed patients is not advised.
Pregnancy and Breast Feeding
Patients should be advised to notify their physician if they
- ⇨become pregnant or intend to become pregnant during therapy.
- ⇨are breastfeeding an infant.
Need for Comprehensive Treatment Program
Escitalopram oral solution is indicated as an integral part of a total treatment program for MDD that may include other measures (psychological, educational, social) for patients with this syndrome. Drug treatment may not be indicated for all adolescents with this syndrome. Safety and effectiveness of escitalopram oral solution in MDD has not been established in pediatric patients less than 12 years of age. Antidepressants are not intended for use in the adolescent who exhibits symptoms secondary to environmental factors and/or other primary psychiatric disorders. Appropriate educational placement is essential and psychosocial intervention is often helpful. When remedial measures alone are insufficient, the decision to prescribe antidepressant medication will depend upon the physician's assessment of the chronicity and severity of the patient's symptoms.
Mfd. by: Taro Pharmaceuticals Inc., Brampton, Ontario, Canada L6T 1C1
Dist. by: Taro Pharmaceuticals U.S.A., Inc., Hawthorne, NY 10532
Revised: May, 2017
PK-6956-6
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