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Details

Stereochemistry ABSOLUTE
Molecular Formula C19H20FNO3.ClH
Molecular Weight 365.826
Optical Activity ( - )
Defined Stereocenters 2 / 2
E/Z Centers 0
Charge 0

SHOW SMILES / InChI
Structure of PAROXETINE HYDROCHLORIDE ANHYDROUS

SMILES

Cl.FC1=CC=C(C=C1)[C@@H]2CCNC[C@H]2COC3=CC=C4OCOC4=C3

InChI

InChIKey=GELRVIPPMNMYGS-RVXRQPKJSA-N
InChI=1S/C19H20FNO3.ClH/c20-15-3-1-13(2-4-15)17-7-8-21-10-14(17)11-22-16-5-6-18-19(9-16)24-12-23-18;/h1-6,9,14,17,21H,7-8,10-12H2;1H/t14-,17-;/m0./s1

HIDE SMILES / InChI

Description
Curator's Comment: Description was created based on several sources, including http://www.accessdata.fda.gov/drugsatfda_docs/label/2008/020031s060,020936s037,020710s024lbl.pdf

Paroxetine, also known by the trade names Paxil and Seroxat. PAXIL (paroxetine hydrochloride) is an orally administered psychotropic drug. It is the hydrochloride salt of a phenylpiperidine compound identified chemically as (-)-trans-4R-(4'fluorophenyl)-3S-[(3',4'-methylenedioxyphenoxy) methyl] piperidine hydrochloride hemihydrate. It is used to treat major depressive disorder, obsessive-compulsive disorder, social anxiety disorder, panic disorder, posttraumatic stress disorder, generalized anxiety disorder and premenstrual dysphoric disorder. Paroxetine is a potent and highly selective inhibitor of neuronal serotonin reuptake. Paroxetine likely inhibits the reuptake of serotonin at the neuronal membrane, enhances serotonergic neurotransmission by reducing turnover of the neurotransmitter, therefore it prolongs its activity at synaptic receptor sites and potentiates 5-HT in the CNS; paroxetine is more potent than both sertraline and fluoxetine in its ability to inhibit 5-HT reuptake. Compared to the tricyclic antidepressants, SSRIs have dramatically decreased binding to histamine, acetylcholine, and norepinephrine receptors. The mechanism of action for the treatment of vasomotor symptoms is unknown. Paroxetine, a phenylpiperidine derivative, was originally developed in 1975 by Jorgen Buus-Lassen and associates working in a small Danish company Ferrosan. Paroxetine was the second SSRI synthesized by Buus-Lassen In 1975.

Approval Year

Targets

Targets

Primary TargetPharmacologyConditionPotency
2.01 nM [IC50]
Conditions

Conditions

ConditionModalityTargetsHighest PhaseProduct
Primary
PAXIL

Approved Use

Major Depressive Disorder Paroxetine tablets, USP are indicated for the treatment of major depressive disorder. The efficacy of paroxetine 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 in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine 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 for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets, USP 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 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 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, USP 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 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 paroxetine 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 paroxetine 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 Paroxetine tablets, USP are 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 paroxetine in the treatment of GAD was established in two 8-week placebo-controlled trials in adults with GAD. Paroxetine 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 paroxetine in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking paroxetine 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 paroxetine for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

Launch Date

1992
Primary
PAXIL

Approved Use

Major Depressive Disorder Paroxetine tablets, USP are indicated for the treatment of major depressive disorder. The efficacy of paroxetine 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 in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine 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 for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets, USP 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 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 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, USP 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 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 paroxetine 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 paroxetine 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 Paroxetine tablets, USP are 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 paroxetine in the treatment of GAD was established in two 8-week placebo-controlled trials in adults with GAD. Paroxetine 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 paroxetine in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking paroxetine 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 paroxetine for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

Launch Date

1992
Primary
PAXIL

Approved Use

Major Depressive Disorder Paroxetine tablets, USP are indicated for the treatment of major depressive disorder. The efficacy of paroxetine 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 in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine 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 for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets, USP 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 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 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, USP 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 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 paroxetine 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 paroxetine 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 Paroxetine tablets, USP are 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 paroxetine in the treatment of GAD was established in two 8-week placebo-controlled trials in adults with GAD. Paroxetine 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 paroxetine in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking paroxetine 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 paroxetine for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

Launch Date

1992
Primary
PAXIL

Approved Use

Major Depressive Disorder Paroxetine tablets, USP are indicated for the treatment of major depressive disorder. The efficacy of paroxetine 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 in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine 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 for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets, USP 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 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 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, USP 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 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 paroxetine 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 paroxetine 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 Paroxetine tablets, USP are 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 paroxetine in the treatment of GAD was established in two 8-week placebo-controlled trials in adults with GAD. Paroxetine 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 paroxetine in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking paroxetine 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 paroxetine for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

Launch Date

1992
Primary
PAXIL

Approved Use

Major Depressive Disorder Paroxetine tablets, USP are indicated for the treatment of major depressive disorder. The efficacy of paroxetine 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 in hospitalized depressed patients have not been adequately studied. The efficacy of paroxetine 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 for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient. Obsessive Compulsive Disorder Paroxetine tablets, USP 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 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 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, USP 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 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 paroxetine 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 paroxetine 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 Paroxetine tablets, USP are 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 paroxetine in the treatment of GAD was established in two 8-week placebo-controlled trials in adults with GAD. Paroxetine 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 paroxetine in maintaining a response in patients with Generalized Anxiety Disorder, who responded during an 8-week acute treatment phase while taking paroxetine 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 paroxetine for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

Launch Date

1992
Cmax

Cmax

ValueDoseCo-administeredAnalytePopulation
61.7 μg/mL
30 mg 1 times / day steady-state, oral
dose: 30 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
13.7 μg/mL
30 mg single, oral
dose: 30 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
AUC

AUC

ValueDoseCo-administeredAnalytePopulation
1020 μg × h/mL
30 mg 1 times / day steady-state, oral
dose: 30 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
145 μg × h/mL
30 mg single, oral
dose: 30 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
T1/2

T1/2

ValueDoseCo-administeredAnalytePopulation
21 h
30 mg 1 times / day steady-state, oral
dose: 30 mg
route of administration: Oral
experiment type: STEADY-STATE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
9.8 h
30 mg single, oral
dose: 30 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
Funbound

Funbound

ValueDoseCo-administeredAnalytePopulation
6%
30 mg single, oral
dose: 30 mg
route of administration: Oral
experiment type: SINGLE
co-administered:
PAROXETINE plasma
Homo sapiens
population: HEALTHY
age: ADULT
sex: MALE
food status: UNKNOWN
Doses

Doses

DosePopulationAdverse events​
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Other AEs: Lethargy, Restless leg syndrome...
Other AEs:
Lethargy (2.4%)
Restless leg syndrome (2.4%)
Dizziness (2.4%)
Nausea (2.4%)
Insomnia (2.4%)
Panic attack (2.4%)
Sexual dysfunction (2.4%)
Cardiac arrhythmia (2.4%)
Balance disorder (2.4%)
Heartburn (2.4%)
Anxiety (2.4%)
Sources: Page: p.1231
AEs

AEs

AESignificanceDosePopulation
Anxiety 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Balance disorder 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Cardiac arrhythmia 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Dizziness 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Heartburn 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Insomnia 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Lethargy 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Nausea 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Panic attack 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Restless leg syndrome 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Sexual dysfunction 2.4%
40 mg 1 times / day multiple, oral (max)
Studied dose
Dose: 40 mg, 1 times / day
Route: oral
Route: multiple
Dose: 40 mg, 1 times / day
Sources: Page: p.1231
unhealthy, ADULT
n = 42
Health Status: unhealthy
Condition: Parkinson disease
Age Group: ADULT
Sex: M+F
Food Status: UNKNOWN
Population Size: 42
Sources: Page: p.1231
Overview

Overview

OverviewOther

Other InhibitorOther SubstrateOther Inducer





Drug as perpetrator​

Drug as perpetrator​

TargetModalityActivityMetaboliteClinical evidence
no
no (co-administration study)
Comment: Administration with caffeine: The CMR did not change after paroxetine
no
no (co-administration study)
Comment: Administration with mephenytoin: No statistically significant trend was seen after paroxetine .
no
unlikely (co-administration study)
Comment: paroxetine’s extent of inhibition of CYP3A4 activity is not likely to be of clinical significance
strong
yes (co-administration study)
Comment: Many potential DDIs: see https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/207139Orig1s000lbl.pdf#page=15
yes [IC50 1.03 uM]
yes [IC50 29.8 uM]
yes [Ki 35 uM]
Drug as victim

Drug as victim

TargetModalityActivityMetaboliteClinical evidence
yes
Tox targets

Tox targets

TargetModalityActivityMetaboliteClinical evidence
PubMed

PubMed

TitleDatePubMed
Hyponatremia in an older patient.
1999 Aug
Stopping the pills.
1999 Aug 14
Effect of buspirone on sexual dysfunction in depressed patients treated with selective serotonin reuptake inhibitors.
1999 Jun
Syndrome of inappropriate secretion of antidiuretic hormone induced by paroxetine.
1999 Sep 27
Cocaine-associated stroke: three cases and rehabilitation considerations.
2000 Apr
Antidepressant drugs appear to enhance cocaine-induced toxicity.
2000 Feb
Rifampin-induced selective serotonin reuptake inhibitor withdrawal syndrome in a patient treated with sertraline.
2000 Feb
Antidepressant-induced regulation of 5-HT(1b) mRNA in rat dorsal raphe nucleus reverses rapidly after drug discontinuation.
2000 Jul 1
Paroxetine versus nortriptyline in the continuation and maintenance treatment of depression in the elderly.
2001
An ideal trial to test differential onset of antidepressant effect.
2001
Incidence of sexual dysfunction associated with antidepressant agents: a prospective multicenter study of 1022 outpatients. Spanish Working Group for the Study of Psychotropic-Related Sexual Dysfunction.
2001
Economic evaluation of major selective serotonin-reuptake inhibitors in a managed care population.
2001 Apr
[Pharmacotherapy for neuropathic pain caused by injury to the afferent nerve fibers].
2001 Apr 28
Cost-effective treatment of depression with selective serotonin reuptake inhibitors.
2001 Feb
Psychopharmacologic treatment of adolescent depression.
2001 Feb
Reactivity of serotonin in whole blood: relationship with drug response in obsessive-compulsive disorder.
2001 Feb 15
8-OH-DPAT, but not deramciclane, antagonizes the anxiogenic-like action of paroxetine in an elevated plus-maze.
2001 Jan
[Depressive disorders in neurologic rehabilitation: therapy with paroxetine].
2001 Jan
[Bleeding from selective serotonin reuptake inhibitors: a case report].
2001 Jan-Feb
A proposed pathological model in the hippocampus of subjects with schizophrenia.
2001 Jan-Feb
[A patient with nodal tachycardia after general anesthesia during medication with a selective serotonin reuptake inhibitor].
2001 Mar
A meta-analysis of the efficacy and tolerability of paroxetine versus tricyclic antidepressants in the treatment of major depression.
2001 May
Review of sertraline and its clinical applications in psychiatric disorders.
2001 May
Patents

Sample Use Guides

Major Depressive Disorder: PAXIL (paroxetine hydrochloride) 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 to 50 mg/day Obsessive Compulsive Disorder: PAXIL should be administered as a single daily dose with or without food, usually in the morning. The recommended dose of PAXIL 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. Panic Disorder: PAXIL should be administered as a single daily dose with or without food, usually in the morning. The target dose of PAXIL 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. Generalized Anxiety Disorder: PAXIL should be administered as a single daily dose with or without food, usually in the morning. The recommended starting dosage and the established effective dosage is 20 mg/day. Posttraumatic Stress Disorder: PAXIL should be administered as a single daily dose with or without food, usually in the morning. The recommended starting dosage and the established effective dosage is 20 mg/day.
Route of Administration: Oral
Paroxetine over the concentration range 10 nM–100 μM was tested It was found, that paroxetine at concentrations >1 μM could inhibit the ATP induced dye uptake in HEK-hP2X7 cells. Also experiments revealed the IC50 value for paroxetine on hP2X7-induced dye uptake to be 24 μM (95 % confidence interval 18.5–31.7 μM, n=3 independent experiments).
Name Type Language
PAROXETINE HYDROCHLORIDE ANHYDROUS
Common Name English
Paroxetine hydrochloride [WHO-DD]
Common Name English
(-)-(3S,4R)-4-(P-FLUOROPHENYL)-3-((3,4-METHYLENEDIOXY)PHENOXY)-METHYL)PIPERIDINE HYDROCHLORIDE
Common Name English
NSC-758654
Code English
PAROXETINE HYDROCHLORIDE, ANHYDROUS
Common Name English
PAROXETINE HYDROCHLORIDE ANHYDROUS [MI]
Common Name English
PIPERIDINE, 3-((1,3-BENZODIOXOL-5-YLOXY)METHYL)-4-(4-FLUOROPHENYL)-, HYDROCHLORIDE, (3S-TRANS)-
Systematic Name English
Code System Code Type Description
NCI_THESAURUS
C1837
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
CHEBI
7944
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
EVMPD
SUB21705
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
SMS_ID
100000089965
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
HSDB
78246-49-8
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
RXCUI
1311626
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY RxNorm
MERCK INDEX
m8418
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
DAILYMED
3I3T11UD2S
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
PUBCHEM
62878
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
EPA CompTox
DTXSID50228914
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
FDA UNII
3I3T11UD2S
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
CAS
78246-49-8
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY
NSC
758654
Created by admin on Fri Dec 15 15:52:21 GMT 2023 , Edited by admin on Fri Dec 15 15:52:21 GMT 2023
PRIMARY