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Paxil Prescribing Information

This information is not for clinical use. These highlights do not include all the information needed to use Paxil safely and effectively. Before taking Paxil please consult with your doctor. See full prescribing information for Paxil.

Warning

Suicidality and Antidepressant Drugs Antidepressants increased the risk compared to placebo of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults in short-term studies of major depressive disorder (MDD) and other psychiatric disorders. Anyone considering the use of PAXIL or any other antidepressant in a child, adolescent, or young adult must balance this risk with the clinical need. Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction in risk with antidepressants compared to placebo in adults aged 65 and older. Depression and certain other psychiatric disorders are themselves associated with increases in the risk of suicide. Patients of all ages who are started on antidepressant therapy should be monitored appropriately and observed closely for clinical worsening, suicidality, or unusual changes in behavior. Families and caregivers should be advised of the need for close observation and communication with the prescriber. PAXIL is not approved for use in pediatric patients. (See WARNINGS: Clinical Worsening and Suicide Risk, PRECAUTIONS: Information for Patients, and PRECAUTIONS: Pediatric Use.)

Indications And Usage

Major Depressive Disorder PAXIL is indicated for the treatment of major depressive disorder. The efficacy of PAXIL 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 PAXIL in hospitalized depressed patients have not been adequately studied. The efficacy of PAXIL 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 PAXIL for extended periods should periodically re‑evaluate the long‑term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder PAXIL is 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 PAXIL 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 PAXIL for extended periods should periodically re‑evaluate the long‑term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION). Panic Disorder PAXIL is 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 about having additional attacks, worry about the implications or consequences of the attacks, and/or a significant change in behavior related to the attacks. The efficacy of PAXIL was established in three 10- to 12‑week trials in panic disorder patients whose diagnoses corresponded to the DSM‑IIIR category of panic disorder (see CLINICAL PHARMACOLOGY: Clinical Trials). Panic disorder (DSM‑IV) is characterized by recurrent unexpected panic attacks, i.e., a discrete period of intense fear or discomfort in which 4 (or more) of the following symptoms develop abruptly and reach a peak within 10 minutes: (1) palpitations, pounding heart, or accelerated heart rate; (2) sweating; (3) trembling or shaking; (4) sensations of shortness of breath or smothering; (5) feeling of choking; (6) chest pain or discomfort; (7) nausea or abdominal distress; (8) feeling dizzy, unsteady, lightheaded, or faint; (9) derealization (feelings of unreality) or depersonalization (being detached from oneself); (10) fear of losing control; (11) fear of dying; (12) paresthesias (numbness or tingling sensations); (13) chills or hot flushes. Long‑term maintenance of efficacy was demonstrated in a 3‑month relapse prevention trial. In this trial, patients with panic disorder assigned to paroxetine demonstrated a lower relapse rate compared to patients on placebo (see CLINICAL PHARMACOLOGY: Clinical Trials). Nevertheless, the physician who prescribes PAXIL for extended periods should periodically re‑evaluate the long‑term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION). Social Anxiety Disorder PAXIL is indicated for the treatment of social anxiety disorder, also known as social phobia, as defined in DSM‑IV (300.23). Social anxiety disorder is characterized by a marked and persistent fear of 1 or more social or performance situations in which the person is exposed to unfamiliar people or to possible scrutiny by others. Exposure to the feared situation almost invariably provokes anxiety, which may approach the intensity of a panic attack. The feared situations are avoided or endured with intense anxiety or distress. The avoidance, anxious anticipation, or distress in the feared situation(s) interferes significantly with the person's normal routine, occupational or academic functioning, or social activities or relationships, or there is marked distress about having the phobias. Lesser degrees of performance anxiety or shyness generally do not require psychopharmacological treatment. The efficacy of PAXIL was established in three 12‑week trials in adult patients with social anxiety disorder (DSM‑IV). PAXIL has not been studied in children or adolescents with social phobia (see CLINICAL PHARMACOLOGY: Clinical Trials). The effectiveness of PAXIL in long-term treatment of social anxiety disorder, i.e., for more than 12 weeks, has not been systematically evaluated in adequate and well‑controlled trials. Therefore, the physician who elects to prescribe PAXIL for extended periods should periodically re‑evaluate the long‑term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION). Generalized Anxiety Disorder PAXIL is indicated for the treatment of Generalized Anxiety Disorder (GAD), as defined in DSM‑IV. Anxiety or tension associated with the stress of everyday life usually does not require treatment with an anxiolytic. The efficacy of PAXIL in the treatment of GAD was established in two 8‑week placebo‑controlled trials in adults with GAD. PAXIL has not been studied in children or adolescents with Generalized Anxiety Disorder (see CLINICAL PHARMACOLOGY: Clinical Trials). Generalized Anxiety Disorder (DSM‑IV) is characterized by excessive anxiety and worry (apprehensive expectation) that is persistent for at least 6 months and which the person finds difficult to control. It must be associated with at least 3 of the following 6 symptoms: Restlessness or feeling keyed up or on edge, being easily fatigued, difficulty concentrating or mind going blank, irritability, muscle tension, sleep disturbance. The efficacy of PAXIL in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking PAXIL and were then observed for relapse during a period of up to 24 weeks, was demonstrated in a placebo-controlled trial (see CLINICAL PHARMACOLOGY: Clinical Trials). Nevertheless, the physician who elects to use PAXIL for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION). Posttraumatic Stress Disorder PAXIL is indicated for the treatment of Posttraumatic Stress Disorder (PTSD). The efficacy of PAXIL in the treatment of PTSD was established in two 12-week placebo-controlled trials in adults with PTSD (DSM-IV) (see CLINICAL PHARMACOLOGY: Clinical Trials). PTSD, as defined by DSM-IV, requires exposure to a traumatic event that involved actual or threatened death or serious injury, or threat to the physical integrity of self or others, and a response that involves intense fear, helplessness, or horror. Symptoms that occur as a result of exposure to the traumatic event include reexperiencing of the event in the form of intrusive thoughts, flashbacks, or dreams, and intense psychological distress and physiological reactivity on exposure to cues to the event; avoidance of situations reminiscent of the traumatic event, inability to recall details of the event, and/or numbing of general responsiveness manifested as diminished interest in significant activities, estrangement from others, restricted range of affect, or sense of foreshortened future; and symptoms of autonomic arousal including hypervigilance, exaggerated startle response, sleep disturbance, impaired concentration, and irritability or outbursts of anger. A PTSD diagnosis requires that the symptoms are present for at least a month and that they cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. The efficacy of PAXIL in longer-term treatment of PTSD, i.e., for more than 12 weeks, has not been systematically evaluated in placebo-controlled trials. Therefore, the physician who elects to prescribe PAXIL for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION).

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Contraindications

The use of MAOIs intended to treat psychiatric disorders with PAXIL or within 14 days of stopping treatment with PAXIL is contraindicated because of an increased risk of serotonin syndrome. The use of PAXIL within 14 days of stopping an MAOI intended to treat psychiatric disorders is also contraindicated (see WARNINGS and DOSAGE AND ADMINISTRATION). Starting PAXIL 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). PAXIL is contraindicated in patients with a hypersensitivity to paroxetine or any of the inactive ingredients in PAXIL.

Adverse Reactions

Associated With Discontinuation of Treatment Twenty percent (1,199/6,145) of patients treated with PAXIL 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 PAXIL 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 PAXIL compared to placebo) included the following: Major Depressive Disorder OCD Panic Disorder Social Anxiety Disorder Generalized Anxiety Disorder PTSD PAXIL Placebo PAXIL Placebo PAXIL Placebo PAXIL Placebo PAXIL Placebo PAXIL 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 Ejaculationa 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% — — Impotencea — 1.5% 0% — — Libido Decreased 1.0% 0% — — Where numbers are not provided the incidence of the adverse events in patients treated with PAXIL was not >1% or was not greater than or equal to 2 times the incidence of placebo. a. Incidence corrected for gender. 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 PAXIL 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 PAXIL 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 PAXIL 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 PAXIL 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 PAXIL 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 PAXIL at least twice that for placebo, derived from Table 4) were: Asthenia, sweating, nausea, dry mouth, diarrhea, decreased appetite, somnolence, libido decreased, abnormal ejaculation, female genital disorders, and impotence. Incidence in Controlled Clinical Trials The prescriber should be aware that the figures in the tables following cannot be used to predict the incidence of side effects in the course of usual medical practice where patient characteristics and other factors differ from those that prevailed in the clinical trials. Similarly, the cited frequencies cannot be compared with figures obtained from other clinical investigations involving different treatments, uses, and investigators. The cited figures, however, do provide the prescribing physician with some basis for estimating the relative contribution of drug and nondrug factors to the side effect incidence rate in the populations studied. Major Depressive Disorder Table 2 enumerates adverse events that occurred at an incidence of 1% or more among paroxetine‑treated patients who participated in short‑term (6‑week) placebo‑controlled trials in which patients were dosed in a range of 20 mg to 50 mg/day. Reported adverse events were classified using a standard COSTART‑based Dictionary terminology. Table 2. Treatment-Emergent Adverse Experience Incidence in Placebo-Controlled Clinical Trials for Major Depressive Disordera Body System Preferred Term PAXIL (n = 421) Placebo (n = 421) Body as a Whole Headache 18% 17% Asthenia 15% 6% Cardiovascular Palpitation 3% 1% Vasodilation 3% 1% Dermatologic Sweating 11% 2% Rash 2% 1% Gastrointestinal Nausea 26% 9% Dry Mouth 18% 12% Constipation 14% 9% Diarrhea 12% 8% Decreased Appetite 6% 2% Flatulence 4% 2% Oropharynx Disorderb 2% 0% Dyspepsia 2% 1% Musculoskeletal Myopathy 2% 1% Myalgia 2% 1% Myasthenia 1% 0% Nervous System Somnolence 23% 9% Dizziness 13% 6% Insomnia 13% 6% Tremor 8% 2% Nervousness 5% 3% Anxiety 5% 3% Paresthesia 4% 2% Libido Decreased 3% 0% Drugged Feeling 2% 1% Confusion 1% 0% Respiration Yawn 4% 0% Special Senses Blurred Vision 4% 1% Taste Perversion 2% 0% Urogenital System Ejaculatory Disturbancec,d 13% 0% Other Male Genital Disordersc,e 10% 0% Urinary Frequency 3% 1% Urination Disorderf 3% 0% Female Genital Disordersc,g 2% 0% a. Events reported by at least 1% of patients treated with PAXIL are included, except the following events which had an incidence on placebo ≥ PAXIL: Abdominal pain, agitation, back pain, chest pain, CNS stimulation, fever, increased appetite, myoclonus, pharyngitis, postural hypotension, respiratory disorder (includes mostly “cold symptoms” or “URI”), trauma, and vomiting. b. Includes mostly “lump in throat” and “tightness in throat.” c. Percentage corrected for gender. d. Mostly “ejaculatory delay.” e. Includes “anorgasmia,” “erectile difficulties,” “delayed ejaculation/orgasm,” and “sexual dysfunction,” and “impotence.” f. Includes mostly “difficulty with micturition” and “urinary hesitancy.” g. Includes mostly “anorgasmia” and “difficulty reaching climax/orgasm.” Obsessive Compulsive Disorder, Panic Disorder, and Social Anxiety Disorder Table 3 enumerates adverse events that occurred at a frequency of 2% or more among OCD patients on PAXIL who participated in placebo‑controlled trials of 12‑weeks duration in which patients were dosed in a range of 20 mg to 60 mg/day or among patients with panic disorder on PAXIL who participated in placebo‑controlled trials of 10‑ to 12‑weeks duration in which patients were dosed in a range of 10 mg to 60 mg/day or among patients with social anxiety disorder on PAXIL who participated in placebo‑controlled trials of 12‑weeks duration in which patients were dosed in a range of 20 mg to 50 mg/day. Table 3. Treatment-Emergent Adverse Experience Incidence in Placebo-Controlled Clinical Trials for Obsessive Compulsive Disorder, Panic Disorder, and Social Anxiety Disordera Body System Preferred Term Obsessive Compulsive Disorder Panic Disorder Social Anxiety Disorder PAXIL (n = 542) Placebo (n = 265) PAXIL (n = 469) Placebo (n = 324) PAXIL (n = 425) Placebo (n = 339) Body as a Whole Asthenia 22% 14% 14% 5% 22% 14% Abdominal Pain — — 4% 3% — — Chest Pain 3% 2% — — — — Back Pain — — 3% 2% — — Chills 2% 1% 2% 1% — — Trauma — — — — 3% 1% Cardiovascular Vasodilation 4% 1% — — — — Palpitation 2% 0% — — — — Dermatologic Sweating 9% 3% 14% 6% 9% 2% Rash 3% 2% — — — — Gastrointestinal Nausea 23% 10% 23% 17% 25% 7% Dry Mouth 18% 9% 18% 11% 9% 3% Constipation 16% 6% 8% 5% 5% 2% Diarrhea 10% 10% 12% 7% 9% 6% Decreased Appetite 9% 3% 7% 3% 8% 2% Dyspepsia — — — — 4% 2% Flatulence — — — — 4% 2% Increased Appetite 4% 3% 2% 1% — — Vomiting — — — — 2% 1% Musculoskeletal Myalgia — — — — 4% 3% Nervous System Insomnia 24% 13% 18% 10% 21% 16% Somnolence 24% 7% 19% 11% 22% 5% Dizziness 12% 6% 14% 10% 11% 7% Tremor 11% 1% 9% 1% 9% 1% Nervousness 9% 8% — — 8% 7% Libido Decreased 7% 4% 9% 1% 12% 1% Agitation — — 5% 4% 3% 1% Anxiety — — 5% 4% 5% 4% Abnormal Dreams 4% 1% — — — — Concentration Impaired 3% 2% — — 4% 1% Depersonalization 3% 0% — — — — Myoclonus 3% 0% 3% 2% 2% 1% Amnesia 2% 1% — — — — Respiratory System Rhinitis — — 3% 0% — — Pharyngitis — — — — 4% 2% Yawn — — — — 5% 1% Special Senses Abnormal Vision 4% 2% — — 4% 1% Taste Perversion 2% 0% — — — — Urogenital System Abnormal Ejaculationb 23% 1% 21% 1% 28% 1% Dysmenorrhea — — — — 5% 4% Female Genital Disorderb 3% 0% 9% 1% 9% 1% Impotenceb 8% 1% 5% 0% 5% 1% Urinary Frequency 3% 1% 2% 0% — — Urination Impaired 3% 0% — — — — Urinary Tract Infection 2% 1% 2% 1% — — a. Events reported by at least 2% of OCD, panic disorder, and social anxiety disorder in patients treated with PAXIL are included, except the following events which had an incidence on placebo ≥ PAXIL: [OCD]: Abdominal pain, agitation, anxiety, back pain, cough increased, depression, headache, hyperkinesia, infection, paresthesia, pharyngitis, respiratory disorder, rhinitis, and sinusitis. [panic disorder]: Abnormal dreams, abnormal vision, chest pain, cough increased, depersonalization, depression, dysmenorrhea, dyspepsia, flu syndrome, headache, infection, myalgia, nervousness, palpitation, paresthesia, pharyngitis, rash, respiratory disorder, sinusitis, taste perversion, trauma, urination impaired, and vasodilation. [social anxiety disorder]: Abdominal pain, depression, headache, infection, respiratory disorder, and sinusitis. b. Percentage corrected for gender. Generalized Anxiety Disorder and Posttraumatic Stress Disorder Table 4 enumerates adverse events that occurred at a frequency of 2% or more among GAD patients on PAXIL who participated in placebo‑controlled trials of 8‑weeks duration in which patients were dosed in a range of 10 mg/day to 50 mg/day or among PTSD patients on PAXIL who participated in placebo‑controlled trials of 12‑weeks duration in which patients were dosed in a range of 20 mg/day to 50 mg/day. Table 4. Treatment-Emergent Adverse Experience Incidence in Placebo-Controlled Clinical Trials for Generalized Anxiety Disorder and Posttraumatic Stress Disordera Body System Preferred Term Generalized Anxiety Disorder Posttraumatic Stress Disorder PAXIL (n = 735) Placebo (n = 529) PAXIL (n = 676) Placebo (n = 504) Body as a Whole Asthenia 14% 6% 12% 4% Headache 17% 14% — — Infection 6% 3% 5% 4% Abdominal Pain 4% 3% Trauma 6% 5% Cardiovascular Vasodilation 3% 1% 2% 1% Dermatologic Sweating 6% 2% 5% 1% Gastrointestinal Nausea 20% 5% 19% 8% Dry Mouth 11% 5% 10% 5% Constipation 10% 2% 5% 3% Diarrhea 9% 7% 11% 5% Decreased Appetite 5% 1% 6% 3% Vomiting 3% 2% 3% 2% Dyspepsia — — 5% 3% Nervous System Insomnia 11% 8% 12% 11% Somnolence 15% 5% 16% 5% Dizziness 6% 5% 6% 5% Tremor 5% 1% 4% 1% Nervousness 4% 3% — — Libido Decreased 9% 2% 5% 2% Abnormal Dreams 3% 2% Respiratory System Respiratory Disorder 7% 5% — — Sinusitis 4% 3% — — Yawn 4% — 2% <1% Special Senses Abnormal Vision 2% 1% 3% 1% Urogenital System Abnormal Ejaculationb 25% 2% 13% 2% Female Genital Disorderb 4% 1% 5% 1% Impotenceb 4% 3% 9% 1% a. Events reported by at least 2% of GAD and PTSD in patients treated with PAXIL are included, except the following events which had an incidence on placebo ≥ PAXIL [GAD]: Abdominal pain, back pain, trauma, dyspepsia, myalgia, and pharyngitis. [PTSD]: Back pain, headache, anxiety, depression, nervousness, respiratory disorder, pharyngitis, and sinusitis. b. Percentage corrected for gender. Dose Dependency of Adverse Events A comparison of adverse event rates in a fixed‑dose study comparing 10, 20, 30, and 40 mg/day of PAXIL with placebo in the treatment of major depressive disorder revealed a clear dose dependency for some of the more common adverse events associated with use of PAXIL, as shown in Table 5: Table 5. Treatment-Emergent Adverse Experience Incidence in a Dose-Comparison Trial in the Treatment of Major Depressive Disordera Body System/Preferred Term Placebo PAXIL n = 51 10 mg n = 102 20 mg n = 104 30 mg n = 101 40 mg n = 102 Body as a Whole Asthenia 0.0% 2.9% 10.6% 13.9% 12.7% Dermatology Sweating 2.0% 1.0% 6.7% 8.9% 11.8% Gastrointestinal Constipation 5.9% 4.9% 7.7% 9.9% 12.7% Decreased Appetite 2.0% 2.0% 5.8% 4.0% 4.9% Diarrhea 7.8% 9.8% 19.2% 7.9% 14.7% Dry Mouth 2.0% 10.8% 18.3% 15.8% 20.6% Nausea 13.7% 14.7% 26.9% 34.7% 36.3% Nervous System Anxiety 0.0% 2.0% 5.8% 5.9% 5.9% Dizziness 3.9% 6.9% 6.7% 8.9% 12.7% Nervousness 0.0% 5.9% 5.8% 4.0% 2.9% Paresthesia 0.0% 2.9% 1.0% 5.0% 5.9% Somnolence 7.8% 12.7% 18.3% 20.8% 21.6% Tremor 0.0% 0.0% 7.7% 7.9% 14.7% Special Senses Blurred Vision 2.0% 2.9% 2.9% 2.0% 7.8% Urogenital System Abnormal Ejaculation 0.0% 5.8% 6.5% 10.6% 13.0% Impotence 0.0% 1.9% 4.3% 6.4% 1.9% Male Genital Disorders 0.0% 3.8% 8.7% 6.4% 3.7% a. Rule for including adverse events in table: Incidence at least 5% for 1 of paroxetine groups and ≥ twice the placebo incidence for at least 1 paroxetine group. In a fixed‑dose study comparing placebo and 20, 40, and 60 mg of PAXIL in the treatment of OCD, there was no clear relationship between adverse events and the dose of PAXIL to which patients were assigned. No new adverse events were observed in the group treated with 60 mg of PAXIL compared to any of the other treatment groups. In a fixed-dose study comparing placebo and 10, 20, and 40 mg of PAXIL in the treatment of panic disorder, there was no clear relationship between adverse events and the dose of PAXIL to which patients were assigned, except for asthenia, dry mouth, anxiety, libido decreased, tremor, and abnormal ejaculation. In flexible‑dose studies, no new adverse events were observed in patients receiving 60 mg of PAXIL compared to any of the other treatment groups. In a fixed‑dose study comparing placebo and 20, 40, and 60 mg of PAXIL in the treatment of social anxiety disorder, for most of the adverse events, there was no clear relationship between adverse events and the dose of PAXIL to which patients were assigned. In a fixed‑dose study comparing placebo and 20 and 40 mg of PAXIL in the treatment of generalized anxiety disorder, for most of the adverse events, there was no clear relationship between adverse events and the dose of PAXIL to which patients were assigned, except for the following adverse events: Asthenia, constipation, and abnormal ejaculation. In a fixed‑dose study comparing placebo and 20 and 40 mg of PAXIL in the treatment of posttraumatic stress disorder, for most of the adverse events, there was no clear relationship between adverse events and the dose of PAXIL to which patients were assigned, except for impotence and abnormal ejaculation. Adaptation to Certain Adverse Events Over a 4‑ to 6‑week period, there was evidence of adaptation to some adverse events with continued therapy (e.g., nausea and dizziness), but less to other effects (e.g., dry mouth, somnolence, and asthenia). 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 selective serotonin reuptake inhibitors (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. In placebo‑controlled clinical trials involving more than 3,200 patients, the ranges for the reported incidence of sexual side effects in males and females with major depressive disorder, OCD, panic disorder, social anxiety disorder, GAD, and PTSD are displayed in Table 6. Table 6. Incidence of Sexual Adverse Events in Controlled Clinical Trials PAXIL Placebo n (males) 1446 1042 Decreased Libido 6-15% 0-5% Ejaculatory Disturbance 13-28% 0-2% Impotence 2-9% 0-3% n (females) 1822 1340 Decreased Libido 0-9% 0-2% Orgasmic Disturbance 2-9% 0-1% There are no adequate and well‑controlled studies examining sexual dysfunction with paroxetine treatment. Paroxetine treatment has been associated with several cases of priapism. In those cases with a known outcome, patients recovered without sequelae. 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. Weight and Vital Sign Changes Significant weight loss may be an undesirable result of treatment with PAXIL for some patients but, on average, patients in controlled trials had minimal (about 1 pound) weight loss versus smaller changes on placebo and active control. No significant changes in vital signs (systolic and diastolic blood pressure, pulse and temperature) were observed in patients treated with PAXIL in controlled clinical trials. ECG Changes In an analysis of ECGs obtained in 682 patients treated with PAXIL and 415 patients treated with placebo in controlled clinical trials, no clinically significant changes were seen in the ECGs of either group. Liver Function Tests In placebo‑controlled clinical trials, patients treated with PAXIL exhibited abnormal values on liver function tests at no greater rate than that seen in placebo‑treated patients. In particular, the PAXIL‑versus‑placebo comparisons for alkaline phosphatase, SGOT, SGPT, and bilirubin revealed no differences in the percentage of patients with marked abnormalities. Hallucinations In pooled clinical trials of immediate-release paroxetine hydrochloride, hallucinations were observed in 22 of 9089 patients receiving drug and 4 of 3187 patients receiving placebo. Other Events Observed During the Premarketing Evaluation of PAXIL During its premarketing assessment in major depressive disorder, multiple doses of PAXIL were administered to 6,145 patients in phase 2 and 3 studies. The conditions and duration of exposure to PAXIL varied greatly and included (in overlapping categories) open and double-blind studies, uncontrolled and controlled studies, inpatient and outpatient studies, and fixed-dose, and titration studies. During premarketing clinical trials in OCD, panic disorder, social anxiety disorder, generalized anxiety disorder, and posttraumatic stress disorder, 542, 469, 522, 735, and 676 patients, respectively, received multiple doses of PAXIL. Untoward events associated with this exposure were 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 untoward events into a smaller number of standardized event categories. In the tabulations that follow, reported adverse events were classified using a standard COSTART‑based Dictionary terminology. The frequencies presented, therefore, represent the proportion of the 9,089 patients exposed to multiple doses of PAXIL who experienced an event of the type cited on at least 1 occasion while receiving PAXIL. All reported events are included except those already listed in Tables 2 to 5, those reported in terms so general as to be uninformative and those events where a drug cause was remote. It is important to emphasize that although the events reported occurred during treatment with paroxetine, they were not necessarily caused by it. Events are further categorized by body system and listed in order of decreasing frequency according to the following definitions: Frequent adverse events are those occurring on 1 or more occasions in at least 1/100 patients (only those not already listed in the tabulated results from placebo‑controlled trials appear in this listing); infrequent adverse events are those occurring in 1/100 to 1/1,000 patients; rare events are those occurring in fewer than 1/1,000 patients. Events of major clinical importance are also described in the PRECAUTIONS section. Body as a Whole Infrequent: Allergic reaction, chills, face edema, malaise, neck pain; rare: Adrenergic syndrome, cellulitis, moniliasis, neck rigidity, pelvic pain, peritonitis, sepsis, ulcer. Cardiovascular System Frequent: Hypertension, tachycardia; infrequent: Bradycardia, hematoma, hypotension, migraine, postural hypotension, syncope; rare: Angina pectoris, arrhythmia nodal, atrial fibrillation, bundle branch block, cerebral ischemia, cerebrovascular accident, congestive heart failure, heart block, low cardiac output, myocardial infarct, myocardial ischemia, pallor, phlebitis, pulmonary embolus, supraventricular extrasystoles, thrombophlebitis, thrombosis, varicose vein, vascular headache, ventricular extrasystoles. Digestive System :Infrequent: Bruxism, colitis, dysphagia, eructation, gastritis, gastroenteritis, gingivitis, glossitis, increased salivation, liver function tests abnormal, rectal hemorrhage, ulcerative stomatitis; rare: Aphthous stomatitis, bloody diarrhea, bulimia, cardiospasm, cholelithiasis, duodenitis, enteritis, esophagitis, fecal impactions, fecal incontinence, gum hemorrhage, hematemesis, hepatitis, ileitis, ileus, intestinal obstruction, jaundice, melena, mouth ulceration, peptic ulcer, salivary gland enlargement, sialadenitis, stomach ulcer, stomatitis, tongue discoloration, tongue edema, tooth caries. Endocrine System Rare: Diabetes mellitus, goiter, hyperthyroidism, hypothyroidism, thyroiditis. Hemic and Lymphatic Systems Infrequent: Anemia, leukopenia, lymphadenopathy, purpura; rare: Abnormal erythrocytes, basophilia, bleeding time increased, eosinophilia, hypochromic anemia, iron deficiency anemia, leukocytosis, lymphedema, abnormal lymphocytes, lymphocytosis, microcytic anemia, monocytosis, normocytic anemia, thrombocythemia, thrombocytopenia. Metabolic and Nutritional Frequent: Weight gain; infrequent: Edema, peripheral edema, SGOT increased, SGPT increased, thirst, weight loss; rare: Alkaline phosphatase increased, bilirubinemia, BUN increased, creatinine phosphokinase increased, dehydration, gamma globulins increased, gout, hypercalcemia, hypercholesteremia, hyperglycemia, hyperkalemia, hyperphosphatemia, hypocalcemia, hypoglycemia, hypokalemia, hyponatremia, ketosis, lactic dehydrogenase increased, non‑protein nitrogen (NPN) increased. Musculoskeletal System Frequent: Arthralgia; infrequent: Arthritis, arthrosis; rare: Bursitis, myositis, osteoporosis, generalized spasm, tenosynovitis, tetany. Nervous System Frequent: Emotional lability, vertigo; infrequent: Abnormal thinking, alcohol abuse, ataxia, dystonia, dyskinesia, euphoria, hallucinations, hostility, hypertonia, hypesthesia, hypokinesia, incoordination, lack of emotion, libido increased, manic reaction, neurosis, paralysis, paranoid reaction; rare: Abnormal gait, akinesia, antisocial reaction, aphasia, choreoathetosis, circumoral paresthesias, convulsion, delirium, delusions, diplopia, drug dependence, dysarthria, extrapyramidal syndrome, fasciculations, grand mal convulsion, hyperalgesia, hysteria, manic-depressive reaction, meningitis, myelitis, neuralgia, neuropathy, nystagmus, peripheral neuritis, psychotic depression, psychosis, reflexes decreased, reflexes increased, stupor, torticollis, trismus, withdrawal syndrome. Respiratory System Infrequent: Asthma, bronchitis, dyspnea, epistaxis, hyperventilation, pneumonia, respiratory flu; rare: Emphysema, hemoptysis, hiccups, lung fibrosis, pulmonary edema, sputum increased, stridor, voice alteration. Skin and Appendages Frequent: Pruritus; infrequent: Acne, alopecia, contact dermatitis, dry skin, ecchymosis, eczema, herpes simplex, photosensitivity, urticaria; rare: Angioedema, erythema nodosum, erythema multiforme, exfoliative dermatitis, fungal dermatitis, furunculosis; herpes zoster, hirsutism, maculopapular rash, seborrhea, skin discoloration, skin hypertrophy, skin ulcer, sweating decreased, vesiculobullous rash. Special Senses Frequent : Tinnitus; infrequent: Abnormality of accommodation, conjunctivitis, ear pain, eye pain, keratoconjunctivitis, mydriasis, otitis media; rare: Amblyopia, anisocoria, blepharitis, cataract, conjunctival edema, corneal ulcer, deafness, exophthalmos, eye hemorrhage, glaucoma, hyperacusis, night blindness, otitis externa, parosmia, photophobia, ptosis, retinal hemorrhage, taste loss, visual field defect. Urogenital System Infrequent: Amenorrhea, breast pain, cystitis, dysuria, hematuria, menorrhagia, nocturia, polyuria, pyuria, urinary incontinence, urinary retention, urinary urgency, vaginitis; rare: Abortion, breast atrophy, breast enlargement, endometrial disorder, epididymitis, female lactation, fibrocystic breast, kidney calculus, kidney pain, leukorrhea, mastitis, metrorrhagia, nephritis, oliguria, salpingitis, urethritis, urinary casts, uterine spasm, urolith, vaginal hemorrhage, vaginal moniliasis. Postmarketing Reports Voluntary reports of adverse events in patients taking PAXIL that have been received since market introduction and not listed above that may have no causal relationship with the drug include acute pancreatitis, elevated liver function tests (the most severe cases were deaths due to liver necrosis, and grossly elevated transaminases associated with severe liver dysfunction), Guillain‑Barré syndrome, Stevens-Johnson syndrome, toxic epidermal necrolysis, priapism, syndrome of inappropriate ADH secretion, symptoms suggestive of prolactinemia and galactorrhea; extrapyramidal symptoms which have included akathisia, bradykinesia, cogwheel rigidity, dystonia, hypertonia, oculogyric crisis which has been associated with concomitant use of pimozide; tremor and trismus; status epilepticus, acute renal failure, pulmonary hypertension, allergic alveolitis, anaphylaxis, eclampsia, laryngismus, optic neuritis, porphyria, restless legs syndrome (RLS), ventricular fibrillation, ventricular tachycardia (including torsade de pointes), thrombocytopenia, hemolytic anemia, events related to impaired hematopoiesis (including aplastic anemia, pancytopenia, bone marrow aplasia, and agranulocytosis), vasculitic syndromes (such as Henoch-Schönlein purpura), and premature births in pregnant women. There has been a case report of an elevated phenytoin level after 4 weeks of PAXIL and phenytoin coadministration. There has been a case report of severe hypotension when PAXIL was added to chronic metoprolol treatment.

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 PAXIL. Consequently, concomitant use of PAXIL 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 PAXIL was 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 Cmax of 62%, compared to pimozide administered alone. The increase in pimozide AUC and Cmax 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 PAXIL is 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 PAXIL is coadministered with other drugs that may affect the serotonergic neurotransmitter systems, such as triptans, lithium, fentanyl, tramadol, or St. John’s Wort (see WARNINGS: Serotonin Syndrome). The concomitant use of PAXIL with MAOIs (including linezolid and intravenous methylene blue) is contraindicated (see CONTRAINDICATIONS). The concomitant use of PAXIL 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 PAXIL and warfarin should be undertaken with caution (see PRECAUTIONS: 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 PAXIL 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 P450 (oxidative) enzymes. In a study where PAXIL (30 mg once daily) was dosed orally for 4 weeks, steady‑state plasma concentrations of paroxetine were increased by approximately 50% during coadministration with oral cimetidine (300 mg three times daily) for the final week. Therefore, when these drugs are administered concurrently, dosage adjustment of PAXIL after the 20-mg starting dose should be guided by clinical effect. The effect of paroxetine on cimetidine’s pharmacokinetics was not studied. Phenobarbital Phenobarbital induces many cytochrome P450 (oxidative) enzymes. When a single oral 30-mg dose of PAXIL was administered at phenobarbital steady state (100 mg once daily for 14 days), paroxetine AUC and T½ were reduced (by an average of 25% and 38%, respectively) compared to paroxetine administered alone. The effect of paroxetine on phenobarbital pharmacokinetics was not studied. Since PAXIL exhibits nonlinear pharmacokinetics, the results of this study may not address the case where the 2 drugs are both being chronically dosed. No initial dosage adjustment of PAXIL is considered necessary when coadministered with phenobarbital; any subsequent adjustment should be guided by clinical effect. Phenytoin When a single oral 30-mg dose of PAXIL was administered at phenytoin steady state (300 mg once daily for 14 days), paroxetine AUC and T½ were reduced (by an average of 50% and 35%, respectively) compared to PAXIL administered alone. In a separate study, when a single oral 300-mg dose of phenytoin was administered at paroxetine steady state (30 mg once daily for 14 days), phenytoin AUC was slightly reduced (12% on average) compared to phenytoin administered alone. Since both drugs exhibit nonlinear pharmacokinetics, the above studies may not address the case where the 2 drugs are both being chronically dosed. No initial dosage adjustments are considered necessary when these drugs are coadministered; any subsequent adjustments should be guided by clinical effect (see ADVERSE REACTIONS: Postmarketing Reports). Drugs Metabolized by CYP2D6 Many drugs, including most drugs effective in the treatment of major depressive disorder (paroxetine, other SSRIs and many tricyclics), are metabolized by the cytochrome P450 isozyme CYP2D6. Like other agents that are metabolized by CYP2D6, paroxetine may significantly inhibit the activity of this isozyme. In most patients (>90%), this CYP2D6 isozyme is saturated early during dosing with PAXIL. In 1 study, daily dosing of PAXIL (20 mg once daily) under steady‑state conditions increased single dose desipramine (100 mg) Cmax, AUC, and T½ by an average of approximately 2‑, 5‑, and 3‑fold, respectively. Concomitant use of paroxetine with risperidone, a CYP2D6 substrate has also been evaluated. In 1 study, daily dosing of paroxetine 20 mg in patients stabilized on risperidone (4 to 8 mg/day) increased mean plasma concentrations of risperidone approximately 4-fold, decreased 9-hydroxyrisperidone concentrations approximately 10%, and increased concentrations of the active moiety (the sum of risperidone plus 9-hydroxyrisperidone) approximately 1.4-fold. The effect of paroxetine on the pharmacokinetics of atomoxetine has been evaluated when both drugs were at steady state. In healthy volunteers who were extensive metabolizers of CYP2D6, paroxetine 20 mg daily was given in combination with 20 mg atomoxetine every 12 hours. This resulted in increases in steady state atomoxetine AUC values that were 6- to 8-fold greater and in atomoxetine Cmax values that were 3- to 4-fold greater than when atomoxetine was given alone. Dosage adjustment of atomoxetine may be necessary and it is recommended that atomoxetine be initiated at a reduced dose when it is given with paroxetine. Concomitant use of PAXIL with other drugs metabolized by cytochrome CYP2D6 has not been formally studied but may require lower doses than usually prescribed for either PAXIL or the other drug. Therefore, coadministration of PAXIL with other drugs that are metabolized by this isozyme, including certain drugs effective in the treatment of major depressive disorder (e.g., nortriptyline, amitriptyline, imipramine, desipramine, and fluoxetine), phenothiazines, risperidone, and Type 1C antiarrhythmics (e.g., propafenone, flecainide, and encainide), or that inhibit this enzyme (e.g., quinidine), should be approached with caution. However, due to the risk of serious ventricular arrhythmias and sudden death potentially associated with elevated plasma levels of thioridazine, paroxetine and thioridazine should not be coadministered (see CONTRAINDICATIONS and WARNINGS). Tamoxifen is a pro-drug requiring metabolic activation by CYP2D6. Inhibition of CYP2D6 by paroxetine may lead to reduced plasma concentrations of an active metabolite (endoxifen) and hence reduced efficacy of tamoxifen (see PRECAUTIONS). At steady state, when the CYP2D6 pathway is essentially saturated, paroxetine clearance is governed by alternative P450 isozymes that, unlike CYP2D6, show no evidence of saturation (see PRECAUTIONS: Tricyclic Antidepressants [TCAs]). Drugs Metabolized by Cytochrome CYP3A4 An in vivo interaction study involving the coadministration under steady-state conditions of paroxetine and terfenadine, a substrate for cytochrome CYP3A4, revealed no effect of paroxetine on terfenadine pharmacokinetics. In addition, in vitro studies have shown ketoconazole, a potent inhibitor of CYP3A4 activity, to be at least 100 times more potent than paroxetine as an inhibitor of the metabolism of several substrates for this enzyme, including terfenadine, astemizole, cisapride, triazolam, and cyclosporine. Based on the assumption that the relationship between paroxetine’s in vitro Ki and its lack of effect on terfenadine’s in vivo clearance predicts its effect on other CYP3A4 substrates, paroxetine’s extent of inhibition of CYP3A4 activity is not likely to be of clinical significance. Tricyclic Antidepressants (TCAs) Caution is indicated in the coadministration of tricyclic antidepressants (TCAs) with PAXIL, because paroxetine may inhibit TCA metabolism. Plasma TCA concentrations may need to be monitored, and the dose of TCA may need to be reduced, if a TCA is coadministered with PAXIL (see PRECAUTIONS: Drugs Metabolized by Cytochrome CYP2D6). Drugs Highly Bound to Plasma Protein Because paroxetine is highly bound to plasma protein, administration of PAXIL to a patient taking another drug that is highly protein bound may cause increased free concentrations of the other drug, potentially resulting in adverse events. Conversely, adverse effects could result from displacement of paroxetine by other highly bound drugs. Drugs That Interfere With Hemostasis (e.g., NSAIDs, Aspirin, and Warfarin) Serotonin release by platelets plays an important role in hemostasis. Epidemiological studies of the case-control and cohort design that have demonstrated an association between use of psychotropic drugs that interfere with serotonin reuptake and the occurrence of upper gastrointestinal bleeding have also shown that concurrent use of an NSAID or aspirin may potentiate this risk of bleeding. Altered anticoagulant effects, including increased bleeding, have been reported when SSRIs or SNRIs are coadministered with warfarin. Patients receiving warfarin therapy should be carefully monitored when paroxetine is initiated or discontinued. Alcohol Although PAXIL does not increase the impairment of mental and motor skills caused by alcohol, patients should be advised to avoid alcohol while taking PAXIL. Lithium A multiple‑dose study has shown that there is no pharmacokinetic interaction between PAXIL and lithium carbonate. However, due to the potential for serotonin syndrome, caution is advised when PAXIL is coadministered with lithium. Digoxin The steady‑state pharmacokinetics of paroxetine was not altered when administered with digoxin at steady state. Mean digoxin AUC at steady state decreased by 15% in the presence of paroxetine. Since there is little clinical experience, the concurrent administration of paroxetine and digoxin should be undertaken with caution. Diazepam Under steady‑state conditions, diazepam does not appear to affect paroxetine kinetics. The effects of paroxetine on diazepam were not evaluated. Procyclidine Daily oral dosing of PAXIL (30 mg once daily) increased steady‑state AUC0-24, Cmax, and Cmin values of procyclidine (5 mg oral once daily) by 35%, 37%, and 67%, respectively, compared to procyclidine alone at steady state. If anticholinergic effects are seen, the dose of procyclidine should be reduced. Beta-Blockers In a study where propranolol (80 mg twice daily) was dosed orally for 18 days, the established steady‑state plasma concentrations of propranolol were unaltered during coadministration with PAXIL (30 mg once daily) for the final 10 days. The effects of propranolol on paroxetine have not been evaluated (see ADVERSE REACTIONS: Postmarketing Reports). Theophylline Reports of elevated theophylline levels associated with treatment with PAXIL have been reported. While this interaction has not been formally studied, it is recommended that theophylline levels be monitored when these drugs are concurrently administered. Fosamprenavir/Ritonavir Co-administration of fosamprenavir/ritonavir with paroxetine significantly decreased plasma levels of paroxetine. Any dose adjustment should be guided by clinical effect (tolerability and efficacy). Electroconvulsive Therapy (ECT) There are no clinical studies of the combined use of ECT and PAXIL.

Use In Specific Populations

Other Clinical Pharmacology Information Specific Populations Renal and Liver Disease Increased plasma concentrations of paroxetine occur in subjects with renal and hepatic impairment. The mean plasma concentrations in patients with creatinine clearance below 30 mL/min. were approximately 4 times greater than seen in normal volunteers. Patients with creatinine clearance of 30 to 60 mL/min. and patients with hepatic functional impairment had about a 2‑fold increase in plasma concentrations (AUC, Cmax). The initial dosage should therefore be reduced in patients with severe renal or hepatic impairment, and upward titration, if necessary, should be at increased intervals (see DOSAGE AND ADMINISTRATION). Elderly Patients In a multiple‑dose study in the elderly at daily paroxetine doses of 20, 30, and 40 mg, Cmin concentrations were about 70% to 80% greater than the respective Cmin concentrations in nonelderly subjects. Therefore the initial dosage in the elderly should be reduced (see DOSAGE AND ADMINISTRATION). Drug-Drug Interactions In vitro drug interaction studies reveal that paroxetine inhibits CYP2D6. Clinical drug interaction studies have been performed with substrates of CYP2D6 and show that paroxetine can inhibit the metabolism of drugs metabolized by CYP2D6 including desipramine, risperidone, and atomoxetine (see PRECAUTIONS: Drug Interactions).

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