PAROXETINE- paroxetine_tablet, film coated

The mechanism of action of paroxetine in the treatment of MDD, SAD, OCD, PD, GAD, and PTSD is unknown, but is presumed to be linked to potentiation of serotonergic activity in the central nervous system resulting from inhibition of neuronal reuptake of serotonin (5-hydroxy-tryptamine, 5-HT). Studies at clinically relevant doses in humans have demonstrated that paroxetine blocks the uptake of serotonin into human platelets. In vitro Nonlinearity in pharmacokinetics is observed with increasing doses of paroxetine. In a meta-analysis of paroxetine from 4 studies done in healthy volunteers following multiple dosing of 20 mg/day to 40 mg/day, males did not exhibit a significantly lower C max Absorption Paroxetine hydrochloride is completely absorbed after oral dosing of a solution of the hydrochloride salt. In a study in which normal male subjects (n = 15) received 30 mg tablets daily for 30 days, steady-state paroxetine concentrations were achieved by approximately 10 days for most subjects, although it may take substantially longer in an occasional patient. At steady state, mean values of C max max min ½ max min 0-24 Paroxetine is equally bioavailable from the oral suspension and tablet. Effect of Food The effects of food on the bioavailability of paroxetine were studied in subjects administered a single dose with and without food. AUC was only slightly increased (6%) when drug was administered with food but the C max Distribution Paroxetine distributes throughout the body, including the CNS, with only 1% remaining in the plasma. Approximately 95% and 93% of paroxetine is bound to plasma protein at 100 ng/mL and 400 ng/mL, respectively. Under clinical conditions, paroxetine concentrations would normally be less than 400 ng/mL. Paroxetine does not alter the in vitro Elimination Metabolism The mean elimination half-life is approximately 21 hours (CV 32%) after oral dosing of 30 mg tablets daily for 30 days of paroxetine. In steady-state dose proportionality studies involving elderly and nonelderly patients, at doses of 20 mg to 40 mg daily for the elderly and 20 mg to 50 mg daily for the nonelderly, some nonlinearity was observed in both populations, again reflecting a saturable metabolic pathway. In comparison to C min Paroxetine is extensively metabolized after oral administration. The principal metabolites are polar and conjugated products of oxidation and methylation, which are readily cleared. Conjugates with glucuronic acid and sulfate predominate, and major metabolites have been isolated and identified. Data indicate that the metabolites have no more than 1/50 the potency of the parent compound at inhibiting serotonin uptake. The metabolism of paroxetine is accomplished in part by CYP2D6. Saturation of this enzyme at clinical doses appears to account for the nonlinearity of paroxetine kinetics with increasing dose and increasing duration of treatment. The role of this enzyme in paroxetine metabolism also suggests potential drug-drug interactions [see Drug Interactions ( 7 Excretion Approximately 64% of a 30-mg oral solution dose of paroxetine was excreted in the urine with 2% as the parent compound and 62% as metabolites over a 10-day post-dosing period. About 36% was excreted in the feces (probably via the bile), mostly as metabolites and less than 1% as the parent compound over the 10-day post-dosing period. Drug Interaction Studies There are clinically significant, known drug interactions between paroxetine and other drugs [see Drug Interactions ( 7 Figure 1 Impact of Paroxetine on the Pharmacokinetics of Co-Administered Drugs (log scale) Figure 2 Impact of Co-Administered Drugs on the Pharmacokinetics of Paroxetine Theophylline: Drugs Metabolized by Cytochrome CYP3A4 An in vivo in vitro Specific Populations The impact of specific populations on the pharmacokinetics of paroxetine are shown in Figure 3. The recommended starting dosage and maximum dosage of paroxetine is reduced in elderly patients, patients with severe renal impairment, and patients with severe hepatic impairment [see Dosage and Administration ( 2. 4 Figure 3 Impact of Specific Population on the Pharmacokinetics of Paroxetine (log scale) Image Image Image.

Paroxetine tablets are indicated in adults for the treatment of: Major depressive disorder (MDD) Obsessive compulsive disorder (OCD) Panic disorder (PD) Social anxiety disorder (SAD) Generalized anxiety disorder (GAD) Posttraumatic stress disorder (PTSD) Paroxetine is a selective serotonin reuptake inhibitor (SSRI) indicated in adults for the treatment of ( 1 Major Depressive Disorder (MDD) Obsessive Compulsive Disorder (OCD) Panic Disorder (PD) Social Anxiety Disorder (SAD) Generalized Anxiety Disorder (GAD) Posttraumatic Stress Disorder (PTSD).

Recommended starting and maximum daily dosage for MDD, OCD, PD, and PTSD: ( 2. 2 Indication Starting Daily Dose Maximum Daily Dose MDD 20 mg 50 mg OCD 20 mg 60 mg PD 10 mg 60 mg PTSD 20 mg 50 mg Recommended starting dosage for SAD and GAD is 20 mg daily. 3 Elderly patients, patients with severe renal impairment or severe hepatic impairment: Starting dosage is 10 mg daily. Maximum dosage is 40 mg daily. 4 When discontinuing paroxetine tablets, reduce dosage gradually. 7 Administer paroxetine tablets as a single daily dose in the morning, with or without food. The recommended starting dosages and maximum dosages of paroxetine tablets in patients with MDD, OCD, PD, and PTSD are presented in Table 1. In patients with an inadequate response, increase dosage in increments of 10 mg per day at intervals of at least 1 week, depending on tolerability. Table 1 Recommended Daily Dosage of Paroxetine Tablets in Patients with MDD, OCD, PD, and PTSD Indication Starting Dose Maximum Dose MDD 20 mg 50 mg OCD 20 mg 60 mg PD 10 mg 60 mg PTSD 20 mg 50 mg SAD The starting and recommended dosage in patients with SAD is 20 mg daily. In clinical trials the effectiveness of paroxetine tablets was demonstrated in patients dosed in a range of 20 mg to 60 mg daily. While the safety of paroxetine tablets has been evaluated in patients with SAD at doses up to 60 mg daily, available information does not suggest any additional benefit for doses above 20 mg daily [see Clinical Studies ( 14. 4 GAD The starting and recommended dosage in patients with GAD is 20 mg daily. In clinical trials the effectiveness of paroxetine tablets in GAD was demonstrated in patients dosed in a range of 20 mg to 50 mg daily. There is not sufficient evidence to suggest a greater benefit to doses higher than 20 mg daily [see Clinical Studies ( 14. 5 In patients with an inadequate response, increase dosage in increments of 10 mg per day at intervals of at least 1 week, depending on tolerability. Prior to initiating treatment with paroxetine tablets or another antidepressant, screen patients for a personal or family history of bipolar disorder, mania, or hypomania [see Warnings and Precautions ( 5. 6 The recommended initial dosage is 10 mg per day for elderly patients, patients with severe renal impairment, and patients with severe hepatic impairment. Dosage should not exceed 40 mg/day. At least 14 days must elapse between discontinuation of a monoamine oxidase inhibitor (MAOI and initiation of paroxetine tablets. In addition, at least 14 days must elapse after stopping paroxetine before starting an MAOI antidepressant [see Contraindications ( 4 5. 2 Adverse reactions may occur upon discontinuation of paroxetine tablets [see Warnings and Precautions ( 5.

The following adverse reactions are included in more detail in other sections of the prescribing information: Hypersensitivity reactions to paroxetine [see Contraindications ( 4 Suicidal Thoughts and Behaviors [see Warnings and Precautions ( 5. 1 Serotonin Syndrome [see Warnings and Precautions ( 5. 2 Embryofetal Toxicity [see Warnings and Precautions ( 5. 4 Increased Risk of Bleeding [see Warnings and Precautions ( 5. 5 Activation of Mania/Hypomania [see Warnings and Precautions ( 5. 6 Discontinuation Syndrome [see Warnings and Precautions ( 5. 7 Seizures [see Warnings and Precautions ( 5. 8 Angle-closure Glaucoma [see Warnings and Precautions ( 5. 9 Hyponatremia [see Warnings and Precautions ( 5. 10 Bone Fracture [see Warnings and Precautions ( 5. 12 Sexual Dysfunction [see Warnings and Precautions ( 5. 13 Most common adverse reactions (>= 5% and at least twice placebo) are abnormal ejaculation, asthenia, constipation, decreased appetite, diarrhea, dizziness, dry mouth, female genital disorder, impotence, infection, insomnia, libido decreased, male genital disorder, nausea, nervousness, somnolence, sweating, tremor, yawn. ( 6 To report SUSPECTED ADVERSE REACTIONS, contact Zydus Pharmaceuticals (USA) Inc. at 1-877-993-8779 or FDA at 1-800-FDA-1088 or www. gov/medwatch. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The safety data for paroxetine are from: 6-week clinical trials in MDD patients who received paroxetine 20 mg to 50 mg once daily 12-week clinical trials in OCD patients who received paroxetine 20 mg to 60 mg once daily 10- to 12-week clinical trials in PD patients who received paroxetine 10 mg to 60 mg once daily 12-week clinical trials in SAD patients who received paroxetine 20 mg to 50 mg once daily 8-week clinical trials in GAD patients who received paroxetine 10 mg to 50 mg once daily 12-week clinical trials in PTSD patients who received paroxetine 20 mg to 50 mg once daily Adverse Reactions Leading to Discontinuation Twenty percent (1,199/6,145) of patients treated with paroxetine in clinical trials in MDD and 16. 1% (84/522), 11. 8% (64/542), 9. 4% (44/469), 10. 7% (79/735), and 11. 7% (79/676) of patients treated with paroxetine in clinical trials in SAD, OCD, PD, GAD, and PTSD, respectively, discontinued treatment due to an adverse reaction. The most common adverse reactions (>= 1%) associated with discontinuation (i. , those adverse reactions associated with dropout at a rate approximately twice or greater for paroxetine compared to placebo) are presented in Table 3. Table 3 Adverse Reactions Reported as Leading to Discontinuation (>= 1% of Paroxetine-Treated Patients and Greater than Placebo) in MDD, OCD, PD, SAD, GAD, and PTSD Trials Where numbers are not provided the incidence of the adverse reactions in patients treated with paroxetine was not > 1% or was not greater than or equal to 2 times the incidence of placebo. MDD OCD PD SAD GAD PTSD Paroxetine Placebo Paroxetine Placebo Paroxetine Placebo Paroxetine Placebo Paroxetine Placebo Paroxetine Placebo % % % % % % % % % % % % CNS Somnolence 2. 6 Insomnia - - 1. 1 0 - - Agitation 1. 5 - - - Tremor 1. 2 Anxiety - - - 1. 1 0 - - Dizziness - - 1. 2 - - Gastrointestinal Constipation - 1. 1 0 - - Nausea 3. 6 Diarrhea 1 0. 3 - Dry Mouth 1 0. 3 - - - Vomiting 1 0. 3 - 1 0 - - Flatulence 1 0. 3 - - Other Asthenia 1. 2 Abnormal a 1. 5 - - Sweating 1 0. 2 - - Impotence a - 1. 5 0 - - Libido 1 0 - - Most Common Adverse Reactions The most commonly observed adverse reactions associated with the use of paroxetine (incidence of 5% or greater and at least twice that for placebo) were: MDD: OCD: PD: SAD: GAD: PTSD: Adverse Reactions in Patients with MDD Table 4 presents the adverse reactions that occurred at an incidence of 1% or more and greater than placebo in clinical trials of paroxetine-treated patients with MDD. Table 4 Adverse Reactions (>= l% of Paroxetine-Treated Patients and Greater than Placebo) in 6-Week Clinical Trials for MDD a b c d e f Body System/ Adverse Reaction Paroxetine (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 Disorder a 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 Disturbance b,c 13 0 Other Male Genital Disorders b,d 10 0 Urinary Frequency 3 1 Urination Disorder e 3 0 Female Genital Disorders b,f 2 0 Adverse Reactions in Patients with OCD, PD, and SAD Table 5 presents adverse reactions that occurred at a frequency of 2% or more in clinical trials in patients with OCD, PD, and SAD. Table 5 Adverse Reactions (>= 2% of Paroxetine-Treated Patients and Greater than Placebo) in 10 to 12-Week Clinical Trials for OCD, PD, and SAD a Body System/Preferred Term Obsessive Compulsive Disorder Panic Disorder Social Anxiety Disorder Paroxetine Placebo Paroxetine Placebo Paroxetine Placebo (n = 542) (n = 265) (n = 469) (n = 324) (n = 425) (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 Ejaculation a 23 1 21 1 28 1 Dysmenorrhea - - - - 5 4 Female Genital Disorders a 3 0 9 1 9 1 Impotence a 8 1 5 0 5 1 Urinary Frequency 3 1 2 0 - - Urination Impaired 3 0 - - - - Urinary Tract Infection 2 1 2 1 - - Adverse Reactions in Patients with GAD and PTSD Table 6 presents adverse reactions that occurred at a frequency of 2% or more in clinical trials in patients with GAD and PTSD. Table 6 Adverse Reactions (>= 2% of Paroxetine-Treated Patients and Greater than Placebo) in 8- to 12-Week Clinical Trials for GAD and PTSD a a. Body System/Preferred Term Generalized Anxiety Disorder Posttraumatic Stress Disorder Paroxetine Placebo Paroxetine Placebo (n = 735) (n = 529) (n = 676) (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 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 Respiratory System Respiratory 7 5 - - Sinusitis 4 3 - - Yawn 4 - 2 < 1 Special Senses Abnormal Vision 2 1 3 1 Urogenital System Abnormal a 25 2 13 2 Female Genital a 4 1 5 1 Impotence a 4 3 9 1 Dose Dependent Adverse Reactions MDD A comparison of adverse reaction rates in a fixed-dose study comparing paroxetine 10 mg, 20 mg, 30 mg, and 40 mg once daily with placebo in the treatment of MDD revealed dose dependent adverse reactions, as shown in Table 7. Table 7 Adverse Reactions (>= 5% of Paroxetine-Treated Patients and >= Twice the Rate of Placebo) (in a Dose-Comparison Trial in the Treatment of MDD) Body System/Preferred Term Placebo Paroxetine n=51 10 mg n=102 20 mg n=104 30 mg n=101 40 mg n=102 % % % % % Body as a Whole Asthenia 0 2. 7 Dermatology Sweating 2 1 6. 8 Gastrointestinal Constipation 5. 7 Decreased Appetite 2 2 5. 9 Diarrhea 7. 7 Dry Mouth 2 10. 6 Nausea 13. 3 Nervous System Anxiety 0 2 5. 9 Dizziness 3. 7 Nervousness 0 5. 9 Paresthesia 0 2. 9 Somnolence 7. 6 Tremor 0 0 7. 7 Special Senses Blurred Vision 2 2. 8 Urogenital System Abnormal Ejaculation 0 5. 6 13 Impotence 0 1. 9 Male Genital Disorders 0 3. 7 OCD In a fixed-dose study comparing placebo and paroxetine 20 mg, 40 mg, and 60 mg in the treatment of OCD, there was no clear relationship between adverse reactions and the dose of paroxetine to which patients were assigned. PD In a fixed-dose study comparing placebo and paroxetine 10 mg, 20 mg, and 40 mg in the treatment of PD, the following adverse reactions were shown to be dose-dependent: asthenia, dry mouth, anxiety, libido decreased, tremor, and abnormal ejaculation. SAD In a fixed-dose study comparing placebo and paroxetine 20 mg, 40 mg and 60 mg in the treatment of SAD, for most of the adverse reactions, there was no clear relationship between adverse reactions and the dose of paroxetine to which patients were assigned. GAD In a fixed-dose study comparing placebo and paroxetine 20 mg and 40 mg in the treatment of GAD, the following adverse reactions were shown to be dose-dependent: asthenia, constipation, and abnormal ejaculation. PTSD In a fixed-dose study comparing placebo and paroxetine 20 mg and 40 mg in the treatment of PTSD, the following adverse reactions were shown to be dose-dependent: impotence and abnormal ejaculation. Male and Female Sexual Dysfunction 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 SSRI treatment. However, 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 healthcare providers may be reluctant to discuss them. Accordingly, estimates of the incidence of untoward sexual experience and performance cited in labeling may underestimate their actual incidence. The percentage of patients reporting symptoms of sexual dysfunction in males and females with MDD, OCD, PD, SAD, GAD, and PTSD are displayed in Table 8. Table 8 Adverse Reactions Related to Sexual Dysfunction in Patients Treated with Paroxetine in Clinical Trials of MDD, OCD, PD, SAD, GAD, and PTSD Paroxetine Placebo n (males) 1,446 1,042 % % Decreased Libido 6 to15 0 to 5 Ejaculatory Disturbance 13 to 28 0 to 2 Impotence 2 to 9 0 to 3 n (females) 1,822 1,340 % % Decreased Libido 0 to 9 0 to 2 Orgasmic Disturbance 2 to 9 0 to 1 Paroxetine treatment has been associated with several cases of priapism. In those cases with a known outcome, patients recovered without sequelae. Hallucinations In pooled clinical trials of paroxetine, hallucinations were observed in 0. 2% of paroxetine-treated patients compared to 0. 1% of patients receiving placebo. Less Common Adverse Reactions The following adverse reactions occurred during the clinical studies of paroxetine and are not included elsewhere in the labeling. Adverse reactions are categorized by body system and listed in order of decreasing frequency according to the following definitions: Frequent adverse reactions are those occurring on 1 or more occasions in at least 1/100 patients; infrequent adverse reactions are those occurring in 1/100 to 1/1,000 patients; rare adverse reactions are those occurring in fewer than 1/1,000 patients. Body as a Whole Infrequent: rare: Cardiovascular System Frequent: infrequent: rare: Digestive System Infrequent: rare: Endocrine System Rare: Hemic and Lymphatic Systems Infrequent: rare: Metabolic and Nutritional Frequent: infrequent: rare: Musculoskeletal System Frequent: infrequent: rare: Nervous System Frequent: infrequent: rare: Respiratory System Infrequent: rare: Skin and Appendages Frequent: rare: Special Senses Frequent: rare: Urogenital System Infrequent: rare: The following reactions have been identified during post approval use of paroxetine. Because these reactions are reported voluntarily from a population of unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. 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-Barr¡SR syndrome, Stevens-Johnson syndrome, toxic epidermal necrolysis, drug reaction with eosinophilia and systemic symptoms (DRESS), syndrome of inappropriate ADH secretion, prolactinemia and galactorrhea; extrapyramidal symptoms which have included akathisia, bradykinesia, cogwheel rigidity, oculogyric crisis which has been associated with concomitant use of pimozide; status epilepticus, acute renal failure, pulmonary hypertension, allergic alveolitis, anosmia, hyposmia, anaphylaxis, eclampsia, laryngismus, optic neuritis, porphyria, restless legs syndrome (RLS), ventricular fibrillation, ventricular tachycardia (including torsade de pointes), 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 severe hypotension when paroxetine was added to chronic metoprolol treatment.

Paroxetine tablets are contraindicated in patients: Taking, or within 14 days of stopping, MAOIs (including the MAOIs linezolid and intravenous methylene blue) because of an increased risk of serotonin syndrome [see Warnings and Precautions ( 5. 2 7) Taking thioridazine because of risk of QT prolongation [see Warnings and Precautions ( 5. 3 7 Taking pimozide because of risk of QT prolongation [see Warnings and Precautions ( 5. 3 7 With known hypersensitivity (e. , anaphylaxis, angioedema, Stevens-Johnson syndrome) to paroxetine or any of the inactive ingredients in paroxetine tablets [ see Adverse Reactions ( 6. 2 Concomitant use of monoamine oxidase inhibitors (MAOIs) or use within 14 days of discontinuing a MAOI. 3 7 Concomitant use of pimozide or thioridazine. 3 7 Known hypersensitivity to paroxetine or to any of the inactive ingredients in paroxetine tablets.

Pregnancy: 8. 1 Risk Summary Based on data from published observational studies, exposure to SSRIs, particularly in the month before delivery, has been associated with a less than 2-fold increase in the risk of postpartum hemorrhage [see Warnings and Precautions ( 5. 5 Paroxetine is associated with a less than 2-fold increase in cardiovascular malformations when administered to a pregnant woman during the first trimester. While individual epidemiological studies on the association between paroxetine use and cardiac malformations have reported inconsistent findings, some meta-analyses of epidemiological studies have identified an increased risk of cardiovascular malformations (see Data). (see Data) (see Clinical Considerations). No evidence of treatment related malformations was observed in animal reproduction studies, when paroxetine was administered during the period of organogenesis at doses up to 50 mg/kg/day in rats and 6 mg/kg/day in rabbits. These doses are approximately 8 (rat) and less than 2 (rabbit) times the maximum recommended human dose (MRHD en dash 60 mg) on an mg/m2 basis. When paroxetine was administered to female rats during the last trimester of gestation and continued through lactation, there was an increase in the number of pup deaths during the first four days of lactation. This effect occurred at a dose of 1 mg/kg/day which is less than the MRHD on an mg/m2 basis ( See Data The background risks of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss or other adverse outcomes. In the US general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Clinical Considerations Disease-associated maternal and/or embryofetal risk Women who discontinue antidepressants during pregnancy are more likely to experience a relapse of major depression than women who continue antidepressants. This finding is from a prospective, longitudinal study of 201 pregnant women with a history of major depressive disorder who were euthymic and taking antidepressants at the beginning of pregnancy. Consider the risk of untreated depression when discontinuing or changing treatment with antidepressant medication during pregnancy and the postpartum. Maternal Adverse Reactions Use of paroxetine in the month before delivery may be associated with an increased risk of postpartum hemorrhage [see Warnings and Precautions ( 5. 5 Fetal/Neonatal adverse reactions Neonates exposed to paroxetine and other SSRIs late in the third trimester have developed complications requiring prolonged hospitalization, respiratory support and tube feeding. Such complications can arise immediately upon delivery. Reported clinical findings have included respiratory distress, cyanosis, apnea, seizures, temperature instability, feeding difficulty, vomiting, hypoglycemia, hypotonia, hypertonia, hyperreflexia, tremors, jitteriness, irritability and constant crying. These findings are consistent with either a direct toxic effect of SSRIs or possibly a drug discontinuation syndrome. It should be noted that, in some cases, the clinical picture is consistent with serotonin syndrome [see Warnings and Precautions ( 5. 2 Data Human Data Published epidemiological studies on the association between first trimester paroxetine use and cardiovascular malformations have reported inconsistent results; however, meta-analyses of population-based cohort studies published between 1996 en dash 2017 indicate a less than 2-fold increased risk for overall cardiovascular malformations. Specific cardiac malformations identified in two meta-analyses include an approximately 2 to 2. 5-fold increased risk for right ventricular outflow tract defects. One meta-analysis also identified an increased risk (less than 2-fold) for bulbus cordis anomalies and anomalies of cardiac septal closure, and an increased risk for atrial septal defect (pooled OR 2. 38, 95% CI 1. Important limitations of the studies included in these meta-analyses include potential confounding by indication, depression severity and potential exposure misclassification. Exposure to SSRIs, particularly later in pregnancy, may have an increased risk for PPHN. PPHN occurs in 1-2 per 1000 live births in the general population and is associated with substantial neonatal morbidity and mortality. Animal Data Reproduction studies were performed at doses up to 50 mg/kg/day in rats and 6 mg/kg/day in rabbits administered during organogenesis. These doses are approximately 8 (rat) and less than 2 (rabbit) times the maximum recommended human dose (MRHD 60 mg) on an mg/m2 basis. These studies have revealed no evidence of developmental effects. However, in rats, there was an increase in pup deaths during the first 4 days of lactation when dosing occurred during the last trimester of gestation and continued throughout lactation. This effect occurred at a dose of 1 mg/kg/day which is less than the MRHD on an mg/m2 basis. The no-effect dose for rat pup mortality was not determined. The cause of these deaths is not known. Risk Summary Data from the published literature report the presence of paroxetine in human milk (see Data). (see Clinical Considerations Clinical Considerations Infants exposed to paroxetine should be monitored for agitation, irritability, poor feeding and poor weight gain. Data Published literature suggests the presence of paroxetine in human milk with relative infant doses ranging between 0. 2%, and a milk/plasma ratio of <1. No significant amounts were detected in the plasma of infants after breastfeeding. Infertility Male Based on findings from clinical studies, paroxetine may affect sperm quality which may impair fertility; it is not known if this effect is reversible [see Nonclinical Toxicology ( 13. 1 The safety and effectiveness of paroxetine in pediatric patients have not been established [see Box Warning]. Antidepressants increase the risk of suicidal thoughts and behaviors in pediatric patients [see Boxed Warning 5. 1 In placebo-controlled clinical trials conducted with pediatric patients, the following adverse reactions were reported in at least 2% of pediatric patients treated with paroxetine and occurred at a rate at least twice that for pediatric patients receiving placebo: emotional lability (including self- harm, suicidal thoughts, attempted suicide, crying, and mood fluctuations), hostility, decreased appetite, tremor, sweating, hyperkinesia, and agitation. Adverse reactions upon discontinuation of treatment with paroxetine in the pediatric clinical trials that included a taper phase regimen, which occurred in at least 2% of patients and at a rate at least twice that of placebo, were: emotional lability (including suicidal ideation, suicide attempt, mood changes, and tearfulness), nervousness, dizziness, nausea, and abdominal pain. In premarketing clinical trials with paroxetine, 17% of patients treated with paroxetine (approximately 700) were 65 years of age or older. Pharmacokinetic studies revealed a decreased clearance in the elderly, and a lower starting dose is recommended; however, no overall differences in safety or effectiveness were observed between elderly and younger patients [see Dosage and Administration ( 2. 3 SSRIs including paroxetine, have been associated with cases of clinically significant hyponatremia in elderly patients, who may be at greater risk for this adverse reaction [see Warnings and Precautions ( 5. 7 Increased plasma concentrations of paroxetine occur in patients with renal and hepatic impairment. The initial dosage of paroxetine should be reduced in patients with severe renal impairment and in patients with severe hepatic impairment [see Dosage and Administration ( 2.

RECENT MAJOR CHANGES
Warnings and Precautions ( 5.4 11/2024
DRUG INTERACTIONS
Table 9 presents clinically significant drug interactions with paroxetine. Table 9 Clinically Significant Drug Interactions with Paroxetine Monoamine Oxidase Inhibitors (MAOIs) Clinical Impact The concomitant use of SSRIs, including paroxetine, and MAOIs increases the risk of serotonin syndrome. Intervention Paroxetine is contraindicated in patients taking MAOIs, including MAOIs such as linezolid or intravenous methylene blue [see Dosage and Administration ( 2. 2 Examples selegiline, tranylcypromine, isocarboxazid, phenelzine, linezolid, methylene blue Pimozide and Thioridazine Clinical Impact Increased plasma concentrations of pimozide and thioridazine, drugs with a narrow therapeutic index, may increase the risk of QTc prolongation and ventricular arrhythmias. Intervention Paroxetine is contraindicated in patients taking pimozide or thioridazine [see Contraindications ( 4 Other Serotonergic Drugs Clinical Impact The concomitant use of serotonergic drugs with paroxetine increases the risk of serotonin syndrome. Intervention Monitor patients for signs and symptoms of serotonin syndrome, particularly during treatment initiation and dosage increases. If serotonin syndrome occurs, consider discontinuation of paroxetine and/or concomitant serotonergic drugs [see Warnings and Precautions ( 5. 2 Examples other SSRIs, SNRIs, triptans, tricyclic antidepressants, opioids, lithium, tryptophan, buspirone, amphetamines and St. John''s Wort. Drugs that Interfere with Hemostasis (antiplatelet agents and anticoagulants) Clinical Impact The concurrent use of an antiplatelet agent or anticoagulant with paroxetine may potentiate the risk of bleeding. Intervention Inform patients of the increased risk of bleeding associated with the concomitant use of paroxetine and antiplatelet agents and anticoagulants. For patients taking warfarin, carefully monitor the international normalized ratio [see Warnings and Precautions ( 5. 5 Examples aspirin, clopidogrel, heparin, warfarin Drugs Highly Bound to Plasma Protein Clinical Impact Paroxetine is highly bound to plasma protein. The concomitant use of paroxetine with another drug that is highly bound to plasma protein may increase free concentrations of paroxetine or other tightly-bound drugs in plasma. Intervention Monitor for adverse reactions and reduce dosage of paroxetine or other protein-bound drugs as warranted. Examples warfarin Drugs Metabolized by CYP2D6 Clinical Impact Paroxetine is a CYP2D6 inhibitor [see Clinical Pharmacology ( 12. 3 Intervention Decrease the dosage of a CYP2D6 substrate if needed with concomitant paroxetine use. Conversely, an increase in dosage of a CYP2D6 substrate may be needed if paroxetine is discontinued. Examples propafenone, flecainide, atomoxetine, desipramine, dextromethorphan, metoprolol, nebivolol, perphenazine, tolterodine, venlafaxine, risperidone. Tamoxifen Clinical Impact Concomitant use of tamoxifen with paroxetine may lead to reduced plasma concentrations of the active metabolite (endoxifen) and reduced efficacy of tamoxifen Intervention Consider use of an alternative antidepressant with little or no [see Warnings and Precautions ( 5. 11 Fosamprenavir/Ritonavir Clinical Impact Co-administration of fosamprenavir/ritonavir with paroxetine significantly decreased plasma levels of paroxetine. Intervention Any dose adjustment should be guided by clinical effect (tolerability and efficacy). Drugs Highly Bound to Plasma Protein: 7 Drugs Metabolized by CYP2D6: 7 Concomitant use with tamoxifen: 5.

OVERDOSAGE
The following have been reported with paroxetine tablet overdosage: Seizures, which may be delayed, and altered mental status including coma. Cardiovascular toxicity, which may be delayed, including QRS and QTc interval prolongation. Hypertension most commonly seen, but rarely can see hypotension alone or with co-ingestants including alcohol. Serotonin syndrome (patients with a multiple drug overdosage with other proserotonergic drugs may have a higher risk). Gastrointestinal decontamination with activated charcoal should be considered in patients who present early after a paroxetine overdose. Consider contacting a Poison Center (1-800-222-1222) or a medical toxicologist for additional overdosage management recommendations.
NONCLINICAL TOXICOLOGY
Carcinogenesis Two-year carcinogenicity studies were conducted in rodents given paroxetine in the diet at 1 mg/kg/day, 5 mg/kg/day, and 25 mg/kg/day (mice) and 1 mg/kg/day, 5 mg/kg/day, and 20 mg/kg/day (rats). These doses are up to 2 (mouse) and 3 (rat) times the MRHD of 60 mg on a mg/m 2 Female rats were not affected. Although there was a dose-related increase in the number of tumors in mice, there was no drug-related increase in the number of mice with tumors. The relevance of these findings to humans is unknown. Mutagenesis Paroxetine produced no genotoxic effects in a battery of 5 in vitro in vivo in vivo in vitro Impairment of Fertility A reduced pregnancy rate was found in reproduction studies in rats at a dose of paroxetine of 15 mg/kg/day, which is 2 times the MRHD of 60 mg on a mg/m 2 2
CLINICAL STUDIES
The efficacy of paroxetine as a treatment for major depressive disorder (MDD) has been established in 6 placebo-controlled studies of patients with MDD (aged 18 to 73). In these studies, paroxetine was shown to be statistically significantly more effective than placebo in treating MDD by at least 2 of the following measures: Hamilton Depression Rating Scale (HDRS), the Hamilton depressed mood item, and the Clinical Global Impression (CGI)-Severity of Illness. Paroxetine was statistically significantly better than placebo in improvement of the HDRS sub-factor scores, including the depressed mood item, sleep disturbance factor, and anxiety factor. Long-term efficacy of paroxetine for treatment of MDD in outpatients was demonstrated in a randomized withdrawal study. Patients who responded to paroxetine (HDRS total score < 8) during an initial 8-week open-label treatment phase were then randomized to continue paroxetine or placebo, for up to 1 year. Patients treated with paroxetine demonstrated a statistically significant lower relapse rate during the withdrawal phase (15%) compared to those on placebo (39%). Effectiveness was similar for male and female patients. The effectiveness of paroxetine in the treatment of obsessive compulsive disorder (OCD) was demonstrated in two 12-week multicenter placebo-controlled studies of adult outpatients (Studies 1 and 2). Patients had moderate to severe OCD (DSM-IIIR) with mean baseline ratings on the Yale Brown Obsessive Compulsive Scale (YBOCS) total score ranging from 23 to 26. In study 1, a dose-range finding study, patients received fixed daily doses of paroxetine 20 mg, 40 mg, or 60 mg. Study 1 demonstrated that daily doses of paroxetine 40 mg and 60 mg are effective in the treatment of OCD. Patients receiving doses of paroxetine 40 mg and 60 mg experienced a mean reduction of approximately 6 and 7 points, respectively, on the YBOCS total score which was statistically significantly greater than the approximate 4-point reduction at 20 mg and a 3-point reduction in the placebo-treated patients. Study 2 was a flexible-dose study comparing paroxetine 20 mg to 60 mg daily with clomipramine 25 mg to 250 mg daily or placebo). In this study, patients receiving paroxetine experienced a mean reduction of approximately 7 points on the YBOCS total score, which was statistically significantly greater than the mean reduction of approximately 4 points in placebo-treated patients. The following table provides the outcome classification by treatment group on Global Improvement items of the Clinical Global Impression (CGI) scale for Study 1. Table 10 Outcome Classification (%) on CGI-Global Improvement Item for Completers in Study 1 in Patients with OCD Outcome Classification Placebo Paroxetine 20 mg Paroxetine 40 mg Paroxetine 60 mg (n = 74) (n = 75) (n = 66) (n = 66) % % % % Worse 14 7 7 3 No Change 44 35 22 19 Minimally Improved 24 33 29 34 Much Improved 11 18 22 24 Very Much Improved 7 7 20 20 Subgroup analyses did not indicate that there were any differences in treatment outcomes as a function of age or gender. The long-term efficacy of paroxetine for the treatment of OCD was established in a long-term extension to Study 1. Patients who responded to paroxetine during the 3-month double-blind phase and a 6-month extension on open-label paroxetine 20 mg to 60 mg daily were randomized to either paroxetine or placebo in a 6-month double-blind relapse prevention phase. Patients randomized to paroxetine were statistically significantly less likely to relapse than placebo-treated patients. The effectiveness of paroxetine in the treatment of panic disorder (PD) was demonstrated in three 10- to 12-week multicenter, placebo-controlled studies of adult outpatients (Studies 1, 2, and 3). Patients had PD (DSM-IIIR), with or without agoraphobia. In these studies, paroxetine was shown to be statistically significantly more effective than placebo in treating PD by at least 2 out of 3 measures of panic attack frequency and on the Clinical Global Impression Severity of Illness score. Study 1 was a 10-week dose-range finding study; patients received fixed doses of paroxetine 10 mg, 20 mg, or 40 mg daily or placebo. A statistically significant difference from placebo was observed only for the paroxetine 40 mg daily group. At endpoint, 76% of patients receiving paroxetine 40 mg daily were free of panic attacks, compared to 44% of placebo-treated patients. Study 2 was a 12-week flexible-dose study comparing paroxetine 10 mg to 60 mg daily and placebo. At endpoint, 51% of paroxetine-treated patients were free of panic attacks compared to 32% of placebo-treated patients. Study 3 was a 12-week flexible-dose study comparing paroxetine 10 mg to 60 mg daily to placebo in patients concurrently receiving standardized cognitive behavioral therapy. At endpoint, 33% of the paroxetine-treated patients showed a reduction to 0 or 1 panic attacks compared to 14% of placebo-treated patients. In Studies 2 and 3, the mean paroxetine dose for completers at endpoint was approximately 40 mg daily. Long-term efficacy of paroxetine in PD was demonstrated in an extension to Study 1. Patients who responded to paroxetine during the 10-week double-blind phase and during a 3-month double-blind extension phase were randomized to either paroxetine 10 mg, 20 mg, or 40 mg daily or placebo in a 3-month double-blind relapse prevention phase. Subgroup analyses did not indicate that there were any differences in treatment outcomes as a function of age or gender. The effectiveness of paroxetine in the treatment of social anxiety disorder (SAD) was demonstrated in three 12-week, multicenter, placebo-controlled studies (Studies 1, 2, and 3) of adult outpatients with SAD (DSM-IV). In these studies, the effectiveness of paroxetine compared to placebo was evaluated on the basis of (1) the proportion of responders, as defined by a Clinical Global Impression (CGI) Improvement score of 1 (very much improved) or 2 (much improved), and (2) change from baseline in the Liebowitz Social Anxiety Scale (LSAS). Studies 1 and 2 were flexible-dose studies comparing paroxetine 20 mg to 50 mg daily and placebo. Paroxetine demonstrated statistically significant superiority over placebo on both the CGI Improvement responder criterion and the Liebowitz Social Anxiety Scale (LSAS). In Study 1, for patients who completed to week 12, 69% of paroxetine-treated patients compared to 29% of placebo-treated patients were CGI Improvement responders. In Study 2, CGI Improvement responders were 77% and 42% for the paroxetine- and placebo-treated patients, respectively. Study 3 was a 12-week study comparing fixed doses of paroxetine 20 mg, 40 mg, or 60 mg daily with placebo. Paroxetine 20 mg was statistically significantly superior to placebo on both the LSAS Total Score and the CGI Improvement responder criterion; there were trends for superiority over placebo for the paroxetine 40 mg and 60 mg daily dose groups. There was no indication in this study of any additional benefit for doses higher than 20 mg daily. Subgroup analyses generally did not indicate differences in treatment outcomes as a function of age, race, or gender. The effectiveness of paroxetine in the treatment of generalized anxiety disorder (GAD) was demonstrated in two 8-week, multicenter, placebo-controlled studies (Studies 1 and 2) of adult outpatients with GAD (DSM-IV). Study 1 was an 8-week study comparing fixed doses of paroxetine 20 mg or 40 mg daily with placebo. Doses of paroxetine 20 mg or 40 mg were both demonstrated to be statistically significantly superior to placebo on the Hamilton Rating Scale for Anxiety (HAM-A) total score. There was not sufficient evidence in this study to suggest a greater benefit for the paroxetine 40 mg daily dose compared to the 20 mg daily dose. Study 2 was a flexible-dose study comparing paroxetine 20 mg to 50 mg daily and placebo. Paroxetine demonstrated statistically significant superiority over placebo on the Hamilton Rating Scale for Anxiety (HAM-A) total score. A third study, a flexible-dose study comparing paroxetine 20 mg to 50 mg daily to placebo, did not demonstrate statistically significant superiority of paroxetine over placebo on the Hamilton Rating Scale for Anxiety (HAM-A) total score, the primary outcome. Subgroup analyses did not indicate differences in treatment outcomes as a function of race or gender. There were insufficient elderly patients to conduct subgroup analyses on the basis of age. In a long-term trial, 566 patients meeting DSM-IV criteria for GAD, who had responded during a single-blind, 8-week acute treatment phase with paroxetine 20 mg to 50 mg daily, were randomized to continuation of paroxetine at their same dose, or to placebo, for up to 24 weeks of observation for relapse. Response during the single-blind phase was defined by having a decrease of >= 2 points compared to baseline on the CGI-Severity of Illness scale, to a score of <= 3. Relapse during the double-blind phase was defined as an increase of >= 2 points compared to baseline on the CGI-Severity of Illness scale to a score of >= 4, or withdrawal due to lack of efficacy. Patients continuing to receive paroxetine experienced a statistically significantly lower relapse rate over the subsequent 24 weeks compared to those receiving placebo. The effectiveness of paroxetine in the treatment of Posttraumatic Stress Disorder (PTSD) was demonstrated in two 12-week, multicenter, placebo-controlled studies (Studies 1 and 2) of adult outpatients who met DSM-IV criteria for PTSD. The mean duration of PTSD symptoms for the 2 studies combined was 13 years (ranging from 0. 1 year to 57 years). The percentage of patients with secondary MDD or non-PTSD anxiety disorders in the combined 2 studies was 41% (356 out of 858 patients) and 40% (345 out of 858 patients), respectively. Study outcome was assessed by (1) the Clinician-Administered PTSD Scale Part 2 (CAPS-2) score and (2) the Clinical Global Impression-Global Improvement Scale (CGI-I). The CAPS-2 is a multi-item instrument that measures 3 aspects of PTSD with the following symptom clusters: Reexperiencing/intrusion, avoidance/numbing and hyperarousal. The 2 primary outcomes for each trial were (1) change from baseline to endpoint on the CAPS-2 total score (17 items), and (2) proportion of responders on the CGI-I, where responders were defined as patients having a score of 1 (very much improved) or 2 (much improved). Study 1 was a 12-week study comparing fixed doses of paroxetine 20 mg or 40 mg daily to placebo. Doses of paroxetine 20 mg and 40 mg were demonstrated to be statistically significantly superior to placebo on change from baseline for the CAPS-2 total score and on proportion of responders on the CGI-I. There was not sufficient evidence in this study to suggest a greater benefit for the 40 mg daily dose compared to the 20 mg daily dose. Study 2 was a 12-week flexible-dose study comparing paroxetine 20 mg to 50 mg daily to placebo. Paroxetine was demonstrated to be significantly superior to placebo on change from baseline for the CAPS-2 total score and on proportion of responders on the CGI-I. A third study, a flexible-dose study comparing paroxetine 20 mg to 50 mg daily to placebo, demonstrated paroxetine to be statistically significantly superior to placebo on change from baseline for CAPS-2 total score, but not on proportion of responders on the CGI-I. The majority of patients in these trials were women (68% women: 377 out of 551 subjects in Study 1 and 66% women: 202 out of 303 subjects in Study 2). Subgroup analyses did not indicate differences in treatment outcomes as a function of gender. There were an insufficient number of patients who were 65 years and older or were non-Caucasian to conduct subgroup analyses on the basis of age or race, respectively.

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