CITALOPRAM HYDROBROMIDE

Citalopram tablets, USP contain citalopram, a selective serotonin reuptake inhibitor (SSRI). Citalopram hydrobromide is a racemic bicyclic phthalane structure and is designated (±)-1-(3-dimethylaminopropyl)-1-(4-fluorophenyl)-1,3‑dihydroisobenzofuran-5-carbonitrile hydrobromide with the following structural formula: The molecular formula is C 20 H 22 BrFN 2 O and its molecular weight is 405.35. Citalopram hydrobromide, USP occurs as a fine, white to off-white powder. Citalopram hydrobromide is sparingly soluble in water and soluble in ethanol. Citalopram, USP 10 mg tablets are film-coated, round shaped tablets containing citalopram hydrobromide in strengths equivalent to 10 mg citalopram base. Citalopram hydrobromide, USP 20 mg and 40 mg tablets are film-coated, oval shaped, scored tablets containing citalopram hydrobromide, in strengths equivalent to 20 mg or 40 mg citalopram base. The tablets also contain the following inactive ingredients: copovidone, croscarmellose sodium, ferric oxide red, ferric oxide yellow, glycerin, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, polyethylene glycol, starch, and titanium dioxide. image description

Citalopram tablets are indicated for the treatment of major depressive disorder (MDD) in adults [see Clinical Studies ( 14 )] . Citalopram is a selective serotonin reuptake inhibitor (SSRI) indicated for the treatment of major depressive disorder (MDD) in adults ( 1 ) .

• Administer once daily with or without food ( 2 ) . • Initial dosage is 20 mg once daily; after one week may increase to maximum dosage of 40 mg once daily ( 2.1 ) . • Patients greater than 60 years of age, patients with hepatic impairment, and CYP2C19 poor metabolizers: maximum recommended dosage is 20 mg once daily ( 2.2 ) . • When discontinuing citalopram tablets, reduce dosage gradually ( 2.4 , 5.6 ) .

Citalopram tablets are contraindicated in patients: • taking, or within 14 days of stopping, MAOIs (including MAOIs such as linezolid or intravenous methylene blue) because of an increased risk of serotonin syndrome [see Warnings and Precautions ( 5.3 ), Drug Interactions ( 7 )] . • taking pimozide because of risk of QT prolongation [see Drug Interactions ( 7 )] . • with known hypersensitivity to citalopram or any of the inactive ingredients in citalopram tablets. Reactions have included angioedema and anaphylaxis [see Adverse Reactions ( 6.2 )] . • Concomitant use of monoamine oxidase inhibitors (MAOIs) or use within 14 days of discontinuing a MAOI ( 4 ) . • Concomiant use of pimozide ( 4 ) . • Known hypersensitivity to citalopram or any of the inactive ingredients of citalopram tablets ( 4 ) .

The following adverse reactions are discussed in greater detail in other sections of the labeling: • Hypersensitivity reactions [see Contraindications ( 4 )] • Suicidal thoughts and behaviors in adolescents and young adults [see Warnings and Precautions ( 5.1 )] • QT-prolongation and torsade de pointes [see Warnings and Precautions ( 5.2 )] • Serotonin syndrome [see Warnings and Precautions ( 5.3 )] • Increased risk of bleeding [see Warnings and Precautions ( 5.4 )] • Activation of mania or hypomania [see Warnings and Precautions ( 5.5 )] • Discontinuation syndrome [see Warnings and Precautions ( 5.6 )] • Seizures [see Warnings and Precautions ( 5.7 )] • Angle-closure glaucoma [see Warnings and Precautions ( 5.8 )] • Hyponatremia [see Warnings and Precautions ( 5.9 )] • Sexual Dysfunction [see Warnings and Precautions ( 5.10 )] Most common adverse reaction (incidence ≥ 5% and twice placebo) is ejaculation disorder (primarily ejaculation delay) ( 6.1 ) . To report SUSPECTED ADVERSE REACTIONS, contact Torrent Pharma Inc . at 1-800-912-9561 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Table 5 presents clinically important drug interactions with citalopram. Table 5: Clinically Important Drug Interactions with Citalopram Monoamine Oxidase Inhibitors (MAOIs) Clinical Impact Concomitant use of SSRIs, including citalopram, and MAOIs increases the risk of serotonin syndrome. Intervention Citalopram is contraindicated in patients taking MAOIs, including MAOIs such as linezolid or intravenous methylene blue [see Dosage and Administration ( 2.5 ), Contraindications ( 4 ), Warnings and Precautions ( 5.3 )] . Pimozide Clinical Impact: Concomitant use of citalopram with pimozide increases plasma concentrations of pimozide, a drug with a narrow therapeutic index, and may increase the risk of QT prolongation and/or ventricular arrhythmias compared to use of citalopram alone [see Clinical Pharmacology ( 12.2 )]. Intervention: Citalopram is contraindicated in patients taking pimozide [see Contraindications ( 4 ), Warnings and Precautions ( 5.2 )]. Drugs that Prolong the QTc Interval Clinical Impact: Concomitant use of citalopram with drugs that prolong QT can cause additional QT prolongation compared to the use of citalopram alone [see Clinical Pharmacology ( 12.2 )]. Intervention: Avoid concomitant use of citalopram with drugs that prolong the QT interval (citalopram is contraindicated in patients taking pimozide) [see Contraindications ( 4 ), Warnings and Precautions ( 5.2 )]. CYP2C19 Inhibitors Clinical Impact: Concomitant use of citalopram with CYP2C19 inhibitors increases the risk of QT prolongation and/or ventricular arrhythmias compared to the use of citalopram alone [see Clinical Pharmacology ( 12.2 )]. Intervention: The maximum recommended dosage of citalopram is 20 mg daily when used concomitantly with a CYP2C19 inhibitor [see Dosage and Administration ( 2.4 ), Warnings and Precautions ( 5.2 )]. Serotonergic Drugs Clinical Impact: Concomitant use of citalopram and other serotonergic drugs increases the risk of serotonin syndrome. Intervention: Monitor patients for signs and symptoms of serotonin syndrome, particularly during citalopram initiation and dosage increases. If serotonin syndrome occurs, consider discontinuation of citalopram and/or concomitant serotonergic drugs [see Warning and Precautions ( 5.3 )]. Drugs That Interfere With Hemostasis (antiplatelet agents and anticoagulants) Clinical Impact: Concomitant use of citalopram and an antiplatelet or anticoagulant may potentiate the risk of bleeding. Intervention: Inform patients of the increased risk of bleeding associated with the concomitant use of citalopram and antiplatelet agents and anticoagulants. For patients taking warfarin, carefully monitor the international normalized ratio [see Warning and Precautions ( 5.4 )]. CYP2C19 Inhibitors : Citalopram tablets 20 mg daily is the maximum recommended dosage for patients taking concomitant CYP2C19 inhibitors ( 5.2 , 7 ) .