Paroxetine Hydrochloride Hemihydrate

Description

DESCRIPTION Paroxetine hydrochloride tablets, USP are an orally administered psychotropic drug. It is the hydrochloride salt of a phenylpiperidine compound identified chemically as (3 S - trans )-3-[(1,3-Benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)-piperidine hydrochloride hemihydrate and has the molecular formula of C 19 H 20 FNO 3

What Is Paroxetine Hydrochloride Hemihydrate Used For?

INDICATIONS AND USAGE Major Depressive Disorder Paroxetine tablets are indicated for the treatment of major depressive disorder. The efficacy of paroxetine tablets in the treatment of a major depressive episode was established in 6-week controlled trials of outpatients whose diagnoses corresponded most closely to the DSM-III category of major depressive disorder (see CLINICAL PHARMACOLOGY: Clinical Trials ). A major depressive episode implies a prominent and relatively persistent depressed or dysphoric mood that usually interferes with daily functioning (nearly every day for at least 2 weeks); it should include at least 4 of the following 8 symptoms: Change in appetite, change in sleep, psychomotor agitation or retardation, loss of interest in usual activities or decrease in sexual drive, increased fatigue, feelings of guilt or worthlessness, slowed thinking or impaired concentration, and a suicide attempt or suicidal ideation. The effects of paroxetine tablets in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine tablets in maintaining a response in major depressive disorder for up to 1 year was demonstrated in a placebo-controlled trial (see CLINICAL PHARMACOLOGY: Clinical Trials ). Nevertheless, the physician who elects to use paroxetine tablets for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets are indicated for the treatment of obsessions and compulsions in patients with obsessive compulsive disorder (OCD) as defined in the DSM-IV. The obsessions or compulsions cause marked distress, are time-consuming, or significantly interfere with social or occupational functioning. The efficacy of paroxetine tablets was established in two 12-week trials with obsessive compulsive outpatients whose diagnoses corresponded most closely to the DSM-IIIR category of obsessive compulsive disorder (see CLINICAL PHARMACOLOGY: Clinical Trials ). Obsessive compulsive disorder is characterized by recurrent and persistent ideas, thoughts, impulses, or images (obsessions) that are ego-dystonic and/or repetitive, purposeful, and intentional behaviors (compulsions) that are recognized by the person as excessive or unreasonable. Long-term maintenance of efficacy was demonstrated in a 6-month relapse prevention trial. In this trial, patients assigned to paroxetine showed a lower relapse rate compared to patients on placebo (see CLINICAL PHARMACOLOGY: Clinical Trials ). Nevertheless, the physician who elects to use paroxetine tablets for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ). Panic Disorder Paroxetine tablets are indicated for the treatment of panic disorder, with or without agoraphobia, as defined in DSM-IV. Panic disorder is characterized by the occurrence of unexpected panic attacks and associated concern...

Dosage and Administration

DOSAGE AND ADMINISTRATION Major Depressive Disorder Usual Initial Dosage Paroxetine tablets should be administered as a single daily dose with or without food, usually in the morning. The recommended initial dose is 20 mg/day. Patients were dosed in a range of 20 mg/day to 50 mg/day in the clinical trials demonstrating the effectiveness of paroxetine tablets in the treatment of major depressive disorder. As with all drugs effective in the treatment of major depressive disorder, the full effect may be delayed. Some patients not responding to a 20 mg dose may benefit from dose increases, in 10 mg/day increments, up to a maximum of 50 mg/day. Dose changes should occur at intervals of at least 1 week. Maintenance Therapy There is no body of evidence available to answer the question of how long the patient treated with paroxetine tablets should remain on it. It is generally agreed that acute episodes of major depressive disorder require several months or longer of sustained pharmacologic therapy. Whether the dose needed to induce remission is identical to the dose needed to maintain and/or sustain euthymia is unknown. Systematic evaluation of the efficacy of paroxetine tablets has shown that efficacy is maintained for periods of up to 1 year with doses that averaged about 30 mg. Obsessive Compulsive Disorder Usual Initial Dosage Paroxetine tablets should be administered as a single daily dose with or without food, usually in the morning. The recommended dose of paroxetine tablets in the treatment of OCD is 40 mg daily. Patients should be started on 20 mg/day and the dose can be increased in 10 mg/day increments. Dose changes should occur at intervals of at least 1 week. Patients were dosed in a range of 20 to 60 mg/day in the clinical trials demonstrating the effectiveness of paroxetine tablets in the treatment of OCD. The maximum dosage should not exceed 60 mg/day. Maintenance Therapy Long-term maintenance of efficacy was demonstrated in a 6-month relapse prevention trial. In this trial, patients with OCD assigned to paroxetine demonstrated a lower relapse rate compared to patients on placebo (see CLINICAL PHARMACOLOGY: Clinical Trials ). OCD is a chronic condition, and it is reasonable to consider continuation for a responding patient. Dosage adjustments should be made to maintain the patient on the lowest effective dosage, and patients should be periodically reassessed to determine the need for continued treatment. Panic Disorder Usual Initial Dosage Paroxetine tablets should be administered as a single daily dose with or without food, usually in the morning. The target dose of paroxetine tablets in the treatment of panic disorder is 40 mg/day. Patients should be started on 10 mg/day. Dose changes should occur in 10 mg/day increments and at intervals of at least 1 week. Patients were dosed in a range of 10 to 60 mg/day in the clinical trials demonstrating the effectiveness of paroxetine tablets. The maximum dosage should not exceed 60 mg/day....

Side Effects (Adverse Reactions)

ADVERSE REACTIONS Associated With Discontinuation of Treatment Twenty percent (1,199/6,145) of patients treated with paroxetine tablets in worldwide clinical trials in major depressive disorder and 16.1% (84/522), 11.8% (64/542), 9.4% (44/469), 10.7% (79/735), and 11.7% (79/676) of patients treated with paroxetine tablets in worldwide trials in social anxiety disorder, OCD, panic disorder, GAD, and PTSD, respectively, discontinued treatment due to an adverse event. The most common events (≥ 1%) associated with discontinuation and considered to be drug related (i.e., those events associated with dropout at a rate approximately twice or greater for paroxetine tablets compared to placebo) included the following: Major Depressive Disorder OCD Panic Disorder Social Anxiety Disorder Generalized Anxiety Disorder PTSD Paroxetine Tablets Placebo Paroxetine Tablets Placebo Paroxetine Tablets Placebo Paroxetine Tablets Placebo Paroxetine Tablets Placebo Paroxetine Tablets Placebo CNS Somnolence 2.3% 0.7% - 1.9% 0.3% 3.4% 0.3% 2.0% 0.2% 2.8% 0.6% Insomnia - - 1.7% 0% 1.3% 0.3% 3.1% 0% Agitation 1.1% 0.5% - Tremor 1.1% 0.3% - 1.7% 0% 1.0% 0.2% Anxiety - - - 1.1% 0% Dizziness - - 1.5% 0% 1.9% 0% 1.0% 0.2% Gastrointestinal Constipation - 1.1% 0% Nausea 3.2% 1.1% 1.9% 0% 3.2% 1.2% 4.0% 0.3% 2.0% 0.2% 2.2% 0.6% Diarrhea 1.0% 0.3% - Dry mouth 1.0% 0.3% - Vomiting 1.0% 0.3% - 1.0% 0% Flatulence 1.0% 0.3% Other Asthenia 1.6% 0.4% 1.9% 0.4% 2.5% 0.6% 1.8% 0.2% 1.6% 0.2% Abnormal ejaculation Incidence corrected for gender. 1.6% 0% 2.1% 0% 4.9% 0.6% 2.5% 0.5% Sweating 1.0% 0.3% - 1.1% 0% 1.1% 0.2% Impotence - 1.5% 0% Libido Decreased 1.0% 0% Where numbers are not provided the incidence of the adverse events in patients treated with paroxetine tablets were not > 1% or was not greater than or equal to 2 times the incidence of placebo. Commonly Observed Adverse Events Major Depressive Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that for placebo, derived from Table 2) were: Asthenia, sweating, nausea, decreased appetite, somnolence, dizziness, insomnia, tremor, nervousness, ejaculatory disturbance, and other male genital disorders. Obsessive Compulsive Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that of placebo, derived from Table 3) were: Nausea, dry mouth, decreased appetite, constipation, dizziness, somnolence, tremor, sweating, impotence, and abnormal ejaculation. Panic Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that for placebo, derived from Table 3) were: Asthenia, sweating, decreased appetite, libido decreased, tremor, abnormal ejaculation, female genital disorders, and impotence. Social Anxiety Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that for placebo, derived from Table 3) were: Sweating, nausea, dry mouth, constipation, decreased appetite, somnolence, tremor, libido decreased, yawn, abnormal ejaculation, female genital disorders, and impotence. Generalized Anxiety Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that for placebo, derived from Table 4) were: Asthenia, infection, constipation, decreased appetite, dry mouth, nausea, libido decreased, somnolence, tremor, sweating, and abnormal ejaculation. Posttraumatic Stress Disorder The most commonly observed adverse events associated with the use of paroxetine (incidence of 5% or greater and incidence for paroxetine tablets at least twice that for placebo, derived from Table 4)...

Drug Interactions

Drug Interactions Tryptophan As with other serotonin reuptake inhibitors, an interaction between paroxetine and tryptophan may occur when they are coadministered. Adverse experiences, consisting primarily of headache, nausea, sweating, and dizziness, have been reported when tryptophan was administered to patients taking paroxetine tablets. Consequently, concomitant use of paroxetine tablets with tryptophan is not recommended (see WARNINGS: Serotonin Syndrome ). Monoamine Oxidase Inhibitors See CONTRAINDICATIONS and WARNINGS . Pimozide In a controlled study of healthy volunteers, after paroxetine tablets were titrated to 60 mg daily, co-administration of a single dose of 2 mg pimozide was associated with mean increases in pimozide AUC of 151% and C max of 62%, compared to pimozide administered alone. The increase in pimozide AUC and C max is due to the CYP2D6 inhibitory properties of paroxetine. Due to the narrow therapeutic index of pimozide and its known ability to prolong the QT interval, concomitant use of pimozide and paroxetine tablets are contraindicated (see CONTRAINDICATIONS ). Serotonergic Drugs Based on the mechanism of action of SNRIs and SSRIs, including paroxetine hydrochloride, and the potential for serotonin syndrome, caution is advised when paroxetine tablets are coadministered with other drugs that may affect the serotonergic neurotransmitter systems, such as triptans, lithium, fentanyl, tramadol, amphetamines, or St. John's Wort (see WARNINGS: Serotonin Syndrome ). The concomitant use of paroxetine tablets with MAOIs (including linezolid and intravenous methylene blue) is contraindicated (see CONTRAINDICATIONS ). The concomitant use of paroxetine tablets with other SSRIs, SNRIs or tryptophan is not recommended (see PRECAUTIONS: Drug Interactions: Tryptophan ). Thioridazine See CONTRAINDICATIONS and WARNINGS . Warfarin Preliminary data suggest that there may be a pharmacodynamic interaction (that causes an increased bleeding diathesis in the face of unaltered prothrombin time) between paroxetine and warfarin. Since there is little clinical experience, the concomitant administration of paroxetine tablets and warfarin should be undertaken with caution (see PRECAUTIONS: Information for Patients: Drugs That Interfere with Hemostasis ). Triptans There have been rare postmarketing reports of serotonin syndrome with the use of an SSRI and a triptan. If concomitant use of paroxetine tablets with a triptan is clinically warranted, careful observation of the patient is advised, particularly during treatment initiation and dose increases (see WARNINGS: Serotonin Syndrome ). Drugs Affecting Hepatic Metabolism The metabolism and pharmacokinetics of paroxetine may be affected by the induction or inhibition of drug-metabolizing enzymes. Cimetidine Cimetidine inhibits many cytochrome P 450 (oxidative) enzymes. In a study where paroxetine tablets (30 mg once daily) was dosed orally for 4 weeks, steady-state plasma concentrations of paroxetine...

Contraindications

CONTRAINDICATIONS The use of MAOIs intended to treat psychiatric disorders with paroxetine tablets or within 14 days of stopping treatment with paroxetine tablets is contraindicated because of an increased risk of serotonin syndrome. The use of paroxetine tablets within 14 days of stopping an MAOI intended to treat psychiatric disorders is also contraindicated (see WARNINGS and DOSAGE AND ADMINISTRATION ). Starting paroxetine tablets in a patient who is being treated with MAOIs such as linezolid or intravenous methylene blue is also contraindicated because of an increased risk of serotonin syndrome (see WARNINGS and DOSAGE AND ADMINISTRATION ). Concomitant use with thioridazine is contraindicated (see WARNINGS and PRECAUTIONS ). Concomitant use in patients taking pimozide is contraindicated (see PRECAUTIONS ). Paroxetine tablets are contraindicated in patients with a hypersensitivity to paroxetine or any of the inactive ingredients in paroxetine tablets.

Pregnancy and Breastfeeding

Pregnancy Pregnancy Category D See WARNINGS: Usage In Pregnancy: Teratogenic Effects and Nonteratogenic Effects .

Nursing Mothers Like many other drugs, paroxetine is secreted in human milk, and caution should be exercised when paroxetine tablets are administered to a nursing woman.

Overdosage

OVERDOSAGE Human Experience Since the introduction of paroxetine tablets in the United States, 342 spontaneous cases of deliberate or accidental overdosage during paroxetine treatment have been reported worldwide (circa 1999). These include overdoses with paroxetine alone and in combination with other substances. Of these, 48 cases were fatal and of the fatalities, 17 appeared to involve paroxetine alone. Eight fatal cases that documented the amount of paroxetine ingested were generally confounded by the ingestion of other drugs or alcohol or the presence of significant comorbid conditions. Of 145 non-fatal cases with known outcome, most recovered without sequelae. The largest known ingestion involved 2000 mg of paroxetine (33 times the maximum recommended daily dose) in a patient who recovered. Commonly reported adverse events associated with paroxetine overdosage include somnolence, coma, nausea, tremor, tachycardia, confusion, vomiting, and dizziness. Other notable signs and symptoms observed with overdoses involving paroxetine (alone or with other substances) include mydriasis, convulsions (including status epilepticus), ventricular dysrhythmias (including torsades de pointes), hypertension, aggressive reactions, syncope, hypotension, stupor, bradycardia, dystonia, rhabdomyolysis, symptoms of hepatic dysfunction (including hepatic failure, hepatic necrosis, jaundice, hepatitis, and hepatic steatosis), serotonin syndrome, manic reactions, myoclonus, acute renal failure, and urinary retention. Overdosage Management No specific antidotes for paroxetine are known. Treatment should consist of those general measures employed in the management of overdosage with any drugs effective in the treatment of major depressive disorder. Ensure an adequate airway, oxygenation, and ventilation. Monitor cardiac rhythm and vital signs. General supportive and symptomatic measures are also recommended. Induction of emesis is not recommended. Due to the large volume of distribution...

How Supplied

HOW SUPPLIED Paroxetine Tablets, USP are available containing paroxetine hydrochloride, USP (hemihydrate) equivalent to 10 mg, 20 mg, 30 mg or 40 mg of paroxetine. The 10 mg tablets are blue, film-coated, modified capsule-shaped, scored tablets debossed with M on one side of the tablet and N to the left of the score and 1 to the right of the score on the other side. They are available as follows: NDC 0378-7001-93 bottles of 30 tablets NDC 0378-7001-10 bottles of 1000 tablets The 20 mg tablets are blue, film-coated, modified capsule-shaped, scored tablets debossed with M on one side of the tablet and N to the left of the score and 2 to the right of the score on the other side. They are available as follows: NDC 0378-7002-93 bottles of 30 tablets NDC 0378-7002-10 bottles of 1000 tablets The 30 mg tablets are blue, film-coated, round, unscored tablets debossed with M over N3 on one side of the tablet and blank on the other side. They are available as follows: NDC 0378-7003-93 bottles of 30 tablets NDC 0378-7003-10 bottles of 1000 tablets The 40 mg tablets are blue, film-coated, round, unscored tablets debossed with M over N4 on one side of the tablet and blank on the other side. They are available as follows: NDC 0378-7004-93 bottles of 30 tablets NDC 0378-7004-10 bottles of 1000 tablets Store at 20° to 25°C (68° to 77°F). [See USP Controlled Room Temperature.] Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure. PHARMACIST: Dispense a Medication Guide with each prescription.