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adverse reactions
6 ADVERSE REACTIONS The following are discussed in more detail in other sections of the labeling: • Increased mortality in elderly patients with dementia-related psychosis [see Boxed Warning and Warnings and Precautions ( 5.1 )] • Cerebrovascular adverse events, including stroke, in elderly patients with dementia-related psychosis [see Warnings and Precautions ( 5.2 )] • Neuroleptic malignant syndrome [see Warnings and Precautions ( 5.3 )] • Tardive dyskinesia [see Warnings and Precautions ( 5.4 )] • Metabolic Changes (Hyperglycemia and diabetes mellitus, Dyslipidemia, and Weight Gain) [see Warnings and Precautions ( 5.5 )] • Hyperprolactinemia [see Warnings and Precautions ( 5.6 )] • Orthostatic hypotension [see Warnings and Precautions ( 5.7 )] • Falls [see Warnings and Precautions ( 5.8 )] • Leukopenia, neutropenia, and agranulocytosis [see Warnings and Precautions ( 5.9 )] • Potential for cognitive and motor impairment [see Warnings and Precautions ( 5.10 )] • Seizures [see Warnings and Precautions ( 5.11 )] • Dysphagia [see Warnings and Precautions ( 5.12 )] • Priapism [see Warnings and Precautions ( 5.13 )] • Disruption of body temperature regulation [see Warnings and Precautions ( 5.14 )] The most common adverse reactions in clinical trials (> 5% and twice placebo) were parkinsonism, akathisia, dystonia, tremor, sedation, dizziness, anxiety, blurred vision, nausea, vomiting, upper abdominal pain, stomach discomfort, dyspepsia, diarrhea, salivary hypersecretion, constipation, dry mouth, increased appetite, increased weight, fatigue, rash, nasal congestion, upper respiratory tract infection, nasopharyngitis, and pharyngolaryngeal pain. The most common adverse reactions that were associated with discontinuation from clinical trials (causing discontinuation in >1% of adults and/or >2% of pediatrics) were nausea, somnolence, sedation, vomiting, dizziness, and akathisia [see Adverse Reactions, Discontinuations Due to Adverse Reactions ( 6.1 )] . The data described in this section are derived from a clinical trial database consisting of 9803 adult and pediatric patients exposed to one or more doses of risperidone tablets for the treatment of schizophrenia, bipolar mania, autistic disorder, and other psychiatric disorders in pediatrics and elderly patients with dementia. Of these 9803 patients, 2687 were patients who received risperidone tablets while participating in double-blind, placebo-controlled trials. The conditions and duration of treatment with risperidone tablets varied greatly and included (in overlapping categories) double-blind, fixed- and flexible-dose, placebo- or active-controlled studies and open-label phases of studies, inpatients and outpatients, and short-term (up to 12 weeks) and longer-term (up to 3 years) exposures. Safety was assessed by collecting adverse events and performing physical examinations, vital signs, body weights, laboratory analyses, and ECGs. The most common adverse reactions in clinical trials (≥5% and twice placebo) were parkinsonism, akathisia, dystonia, tremor, sedation, dizziness, anxiety, blurred vision, nausea, vomiting, upper abdominal pain, stomach discomfort, dyspepsia, diarrhea, salivary hypersecretion, constipation, dry mouth, increased appetite, increased weight, fatigue, rash, nasal congestion, upper respiratory tract infection, nasopharyngitis, and pharyngolaryngeal pain. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Ajanta Pharma USA Inc. at 855-664-7744 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 Clinical Trials Experience 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 clinical practice. Commonly-Observed Adverse Reactions in Double-Blind, Placebo-Controlled Clinical Trials – Schizophrenia Adult Patients with Schizophrenia Table 8 lists the adverse reactions reported in 2% or more of risperidone tablets-treated adult patients with schizophrenia in three 4- to 8-week, double-blind, placebo-controlled trials. Table 8. Adverse Reactions in ≥2% of Risperidone Tablets-Treated Adult Patients (and greater than placebo) with Schizophrenia in Double-Blind, Placebo-Controlled Trials * Parkinsonism includes extrapyramidal disorder, musculoskeletal stiffness, parkinsonism, cogwheel rigidity, akinesia, bradykinesia, hypokinesia, masked facies, muscle rigidity, and Parkinson's disease. Akathisia includes akathisia and restlessness. Dystonia includes dystonia, muscle spasms, muscle contractions involuntary, muscle contracture, oculogyration, tongue paralysis. Tremor includes tremor and parkinsonian rest tremor. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets 2–8 mg per day (N=366) >8–16 mg per day (N=198) Placebo (N=225) Cardiac Disorders Tachycardia 1 3 0 Eye Disorders Vision blurred 3 1 1 Gastrointestinal Disorders Nausea 9 4 4 Constipation 8 9 6 Dyspepsia 8 6 5 Dry mouth 4 0 1 Abdominal discomfort 3 1 1 Salivary hypersecretion 2 1 <1 Diarrhea 2 1 1 General Disorders Fatigue 3 1 0 Chest pain 2 2 1 Asthenia 2 1 <1 Infections and Infestations Nasopharyngitis 3 4 3 Upper respiratory tract infection 2 3 1 Sinusitis 1 2 1 Urinary tract infection 1 3 0 Investigations Blood creatine phosphokinase increased 1 2 <1 Heart rate increased <1 2 0 Musculoskeletal and Connective Tissue Disorders Back pain 4 1 1 Arthralgia 2 3 <1 Pain in extremity 2 1 1 Nervous System Disorders Parkinsonism * 14 17 8 Akathisia * 10 10 3 Sedation 10 5 2 Dizziness 7 4 2 Dystonia * 3 4 2 Tremor * 2 3 1 Dizziness postural 2 0 0 Psychiatric Disorders Insomnia 32 25 27 Anxiety 16 11 11 Respiratory, Thoracic and Mediastinal Disorders Nasal congestion 4 6 2 Dyspnea 1 2 0 Epistaxis <1 2 0 Skin and Subcutaneous Tissue Disorders Rash 1 4 1 Dry skin 1 3 0 Vascular Disorders Orthostatic hypotension 2 1 0 Pediatric Patients with Schizophrenia Table 9 lists the adverse reactions reported in 5% or more of risperidone tablets-treated pediatric patients with schizophrenia in a 6-week double-blind, placebo-controlled trial. Table 9. Adverse Reactions in ≥5% of Risperidone Tablets-Treated Pediatric Patients (and greater than placebo) with Schizophrenia in a Double-Blind Trial * Parkinsonism includes extrapyramidal disorder, muscle rigidity, musculoskeletal stiffness, and hypokinesia. Akathisia includes akathisia and restlessness. Dystonia includes dystonia and oculogyration. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets 1–3 mg per day (N=55) 4–6 mg per day (N=51) Placebo (N=54) Gastrointestinal Disorders Salivary hypersecretion 0 10 2 Nervous System Disorders Sedation 24 12 4 Parkinsonism * 16 28 11 Tremor 11 10 6 Akathisia * 9 10 4 Dizziness 7 14 2 Dystonia * 2 6 0 Psychiatric Disorders Anxiety 7 6 0 Commonly-Observed Adverse Reactions in Double-Blind, Placebo-Controlled Clinical Trials – Bipolar Mania Adult Patients with Bipolar Mania Table 10 lists the adverse reactions reported in 2% or more of risperidone tablets-treated adult patients with bipolar mania in four 3-week, double-blind, placebo-controlled monotherapy trials. Table 10. Adverse Reactions in ≥2% of Risperidone Tablets-Treated Adult Patients (and greater than placebo) with Bipolar Mania in Double-Blind, Placebo-Controlled Monotherapy Trials * Parkinsonism includes extrapyramidal disorder, parkinsonism, musculoskeletal stiffness, hypokinesia, muscle rigidity, muscle tightness, bradykinesia, cogwheel rigidity. Akathisia includes akathisia and restlessness. Tremor includes tremor and parkinsonian rest tremor. Dystonia includes dystonia, muscle spasms, oculogyration, torticollis. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets 1–6 mg per day (N=448) Placebo (N=424) Eye Disorders Vision blurred 2 1 Gastrointestinal Disorders Nausea 5 2 Diarrhea 3 2 Salivary hypersecretion 3 1 Stomach discomfort 2 <1 General Disorders Fatigue 2 1 Nervous System Disorders Parkinsonism * 25 9 Sedation 11 4 Akathisia * 9 3 Tremor * 6 3 Dizziness 6 5 Dystonia * 5 1 Lethargy 2 1 Table 11 lists the adverse reactions reported in 2% or more of risperidone tablets-treated adult patients with bipolar mania in two 3-week, double-blind, placebo-controlled adjuvant therapy trials. Table 11. Adverse Reactions in ≥2% of Risperidone Tablets-Treated Adult Patients (and greater than placebo) with Bipolar Mania in Double-Blind, Placebo-Controlled Adjunctive Therapy Trials * Parkinsonism includes extrapyramidal disorder, hypokinesia and bradykinesia. Akathisia includes hyperkinesia and akathisia. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets + Mood Stabilizer (N=127) Placebo + Mood Stabilizer (N=126) Cardiac Disorders Palpitations 2 0 Gastrointestinal Disorders Dyspepsia 9 8 Nausea 6 4 Diarrhea 6 4 Salivary hypersecretion 2 0 General Disorders Chest pain 2 1 Infections and Infestations Urinary tract infection 2 1 Nervous System Disorders Parkinsonism * 14 4 Sedation 9 4 Akathisia * 8 0 Dizziness 7 2 Tremor 6 2 Lethargy 2 1 Psychiatric Disorders Anxiety 3 2 Respiratory, Thoracic and Mediastinal Disorders Pharyngolaryngeal pain 5 2 Cough 2 0 Pediatric Patients with Bipolar Mania Table 12 lists the adverse reactions reported in 5% or more of risperidone tablets-treated pediatric patients with bipolar mania in a 3-week double-blind, placebo-controlled trial. Table 12. Adverse Reactions in ≥5% of Risperidone Tablets-Treated Pediatric Patients (and greater than placebo) with Bipolar Mania in Double-Blind, Placebo-Controlled Trials * Parkinsonism includes musculoskeletal stiffness, extrapyramidal disorder, bradykinesia, and nuchal rigidity. Dystonia includes dystonia, laryngospasm, and muscle spasms. Akathisia includes restlessness and akathisia. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets Placebo (N=58) 0.5–2.5 mg per day (N=50) 3–6 mg per day (N=61) Eye Disorders Vision blurred 4 7 0 Gastrointestinal Disorders Abdominal pain upper 16 13 5 Nausea 16 13 7 Vomiting 10 10 5 Diarrhea 8 7 2 Dyspepsia 10 3 2 Stomach discomfort 6 0 2 General Disorders Fatigue 18 30 3 Metabolism and Nutrition Disorders Increased appetite 4 7 2 Nervous System Disorders Sedation 42 56 19 Dizziness 16 13 5 Parkinsonism * 6 12 3 Dystonia * 6 5 0 Akathisia * 0 8 2 Psychiatric Disorders Anxiety 0 8 3 Respiratory, Thoracic and Mediastinal Disorders Pharyngolaryngeal pain 10 3 5 Skin and Subcutaneous Tissue Disorders Rash 0 7 2 Commonly-Observed Adverse Reactions in Double-Blind, Placebo-Controlled Clinical Trials - Autistic Disorder Table 13 lists the adverse reactions reported in 5% or more of risperidone tablets-treated pediatric patients treated for irritability associated with autistic disorder in two 8-week, double-blind, placebo-controlled trials and one 6-week double-blind, placebo-controlled study. Table 13. Adverse Reactions in ≥ 5% of Risperidone Tablets-Treated Pediatric Patients (and greater than placebo) Treated for Irritability Associated with Autistic Disorder in Double-Blind, Placebo-Controlled Trials * Parkinsonism includes musculoskeletal stiffness, extrapyramidal disorder, muscle rigidity, cogwheel rigidity, and muscle tightness. System/Organ Class Adverse Reaction Percentage of Patients Reporting Reaction Risperidone Tablets 0.5–4.0 mg per day (N=107) Placebo (N=115) Gastrointestinal Disorders Vomiting 20 17 Constipation 17 6 Dry mouth 10 4 Nausea 8 5 Salivary hypersecretion 7 1 General Disorders and Administration Site Conditions Fatigue 31 9 Pyrexia 16 13 Thirst 7 4 Infections and Infestations Nasopharyngitis 19 9 Rhinitis 9 7 Upper respiratory tract infection 8 3 Investigations Weight increased 8 2 Metabolism and Nutrition Disorders Increased appetite 44 15 Nervous System Disorders Sedation 63 15 Drooling 12 4 Headache 12 10 Tremor 8 1 Dizziness 8 2 Parkinsonism * 8 1 Renal and Urinary Disorders Enuresis 16 10 Respiratory, Thoracic and Mediastinal Disorders Cough 17 12 Rhinorrhea 12 10 Nasal congestion 10 4 Skin and Subcutaneous Tissue Disorders Rash 8 5 Other Adverse Reactions Observed During the Clinical Trial Evaluation of Risperidone The following additional adverse reactions occurred across all placebo-controlled, active-controlled, and open-label studies of risperidone tablets in adults and pediatric patients. Blood and Lymphatic System Disorders: anemia, granulocytopenia, neutropenia Cardiac Disorders: sinus bradycardia, sinus tachycardia, atrioventricular block first degree, bundle branch block left, bundle branch block right, atrioventricular block Ear and Labyrinth Disorders: ear pain, tinnitus Endocrine Disorders: hyperprolactinemia Eye Disorders: ocular hyperemia, eye discharge, conjunctivitis, eye rolling, eyelid edema, eye swelling, eyelid margin crusting, dry eye, lacrimation increased, photophobia, glaucoma, visual acuity reduced Gastrointestinal Disorders: dysphagia, fecaloma, fecal incontinence, gastritis, lip swelling, cheilitis, aptyalism General Disorders: edema peripheral, thirst, gait disturbance, influenza-like illness, pitting edema, edema, chills, sluggishness, malaise, chest discomfort, face edema, discomfort, generalized edema, drug withdrawal syndrome, peripheral coldness, feeling abnormal Immune System Disorders: drug hypersensitivity Infections and Infestations: pneumonia, influenza, ear infection, viral infection, pharyngitis, tonsillitis, bronchitis, eye infection, localized infection, cystitis, cellulitis, otitis media, onychomycosis, acarodermatitis, bronchopneumonia, respiratory tract infection, tracheobronchitis, otitis media chronic Investigations: body temperature increased, blood prolactin increased, alanine aminotransferase increased, electrocardiogram abnormal, eosinophil count increased, white blood cell count decreased, blood glucose increased, hemoglobin decreased, hematocrit decreased, body temperature decreased, blood pressure decreased, transaminases increased Metabolism and Nutrition Disorders: decreased appetite, polydipsia, anorexia Musculoskeletal and Connective Tissue Disorders: joint stiffness, joint swelling, musculoskeletal chest pain, posture abnormal, myalgia, neck pain, muscular weakness, rhabdomyolysis Nervous System Disorders: balance disorder, disturbance in attention, dysarthria, unresponsive to stimuli, depressed level of consciousness, movement disorder, transient ischemic attack, coordination abnormal, cerebrovascular accident, speech disorder, syncope, loss of consciousness, hypoesthesia, tardive dyskinesia, dyskinesia, cerebral ischemia, cerebrovascular disorder, neuroleptic malignant syndrome, diabetic coma, head titubation Psychiatric Disorders: agitation, blunted affect, confusional state, middle insomnia, nervousness, sleep disorder, listlessness, libido decreased, and anorgasmia Renal and Urinary Disorders: enuresis, dysuria, pollakiuria, urinary incontinence Reproductive System and Breast Disorders: menstruation irregular, amenorrhea, gynecomastia, galactorrhea, vaginal discharge, menstrual disorder, erectile dysfunction, retrograde ejaculation, ejaculation disorder, sexual dysfunction, breast enlargement Respiratory, Thoracic, and Mediastinal Disorders: wheezing, pneumonia aspiration, sinus congestion, dysphonia, productive cough, pulmonary congestion, respiratory tract congestion, rales, respiratory disorder, hyperventilation, nasal edema Skin and Subcutaneous Tissue Disorders: erythema, skin discoloration, skin lesion, pruritus, skin disorder, rash erythematous, rash papular, rash generalized, rash maculopapular, acne, hyperkeratosis, seborrheic dermatitis Vascular Disorders: hypotension, flushing Discontinuations Due to Adverse Reactions Schizophrenia - Adults Approximately 7% (39/564) of risperidone tablets-treated patients in double-blind, placebo-controlled trials discontinued treatment due to an adverse reaction, compared with 4% (10/225) who were receiving placebo. The adverse reactions associated with discontinuation in 2 or more risperidone tablets-treated patients were: Table 14. Adverse Reactions Associated With Discontinuation in 2 or More Risperidone Tablets-Treated Adult Patients in Schizophrenia Trials Adverse Reaction Risperidone Tablets Placebo (N=225 ) 2-8 mg/day (N=366) >8-16 mg/day (N=198) Dizziness 1.4% 1.0% 0% Nausea 1.4% 0% 0% Vomiting 0.8% 0% 0% Parkinsonism 0.8% 0% 0% Somnolence 0.8% 0% 0% Dystonia 0.5% 0% 0% Agitation 0.5% 0% 0% Abdominal pain 0.5% 0% 0% Orthostatic hypotension 0.3% 0.5% 0% Akathisia 0.3% 2.0% 0% Discontinuation for extrapyramidal symptoms (including Parkinsonism, akathisia, dystonia, and tardive dyskinesia) was 1% in placebo-treated patients, and 3.4% in active control-treated patients in a double-blind, placebo- and active-controlled trial. Schizophrenia – Pediatrics Approximately 7% (7/106), of risperidone tablets-treated patients discontinued treatment due to an adverse reaction in a double-blind, placebo-controlled trial, compared with 4% (2/54) placebo-treated patients. The adverse reactions associated with discontinuation for at least one risperidone tablets-treated patient were dizziness (2%), somnolence (1%), sedation (1%), lethargy (1%), anxiety (1%), balance disorder (1%), hypotension (1%), and palpitation (1%). Bipolar Mania – Adults In double-blind, placebo-controlled trials with risperidone tablets as monotherapy, approximately 6% (25/448) of risperidone tablets-treated patients discontinued treatment due to an adverse event, compared with approximately 5% (19/424) of placebo-treated patients. The adverse reactions associated with discontinuation in risperidone tablets-treated patients were: Table 15. Adverse Reactions Associated With Discontinuation in 2 or More Risperidone Tablets-Treated Adult Patients in Bipolar Mania Clinical Trials Adverse Reaction Risperidone Tablets 1-6 mg/day (N=448) Placebo (N=448) Parkinsonism 0.4% 0% Lethargy 0.2% 0% Dizziness 0.2% 0% Alanine aminotransferase increased 0.2% 0.2% Aspartate aminotransferase increased 0.2% 0.2% Bipolar Mania – Pediatrics In a double-blind, placebo-controlled trial 12% (13/111) of risperidone tablets-treated patients discontinued due to an adverse reaction, compared with 7% (4/58) of placebo-treated patients. The adverse reactions associated with discontinuation in more than one risperidone tablets-treated pediatric patient were nausea (3%), somnolence (2%), sedation (2%), and vomiting (2%). Autistic Disorder – Pediatrics In the two 8-week, placebo-controlled trials in pediatric patients treated for irritability associated with autistic disorder (n = 156), one risperidone tablets-treated patient discontinued due to an adverse reaction (Parkinsonism), and one placebo-treated patient discontinued due to an adverse event. Dose Dependency of Adverse Reactions in Clinical Trials Extrapyramidal Symptoms Data from two fixed-dose trials in adults with schizophrenia provided evidence of dose-relatedness for extrapyramidal symptoms associated with risperidone tablets treatment. Two methods were used to measure extrapyramidal symptoms (EPS) in an 8-week trial comparing 4 fixed doses of risperidone tablets (2, 6, 10, and 16 mg/day), including (1) a Parkinsonism score (mean change from baseline) from the Extrapyramidal Symptom Rating Scale, and (2) incidence of spontaneous complaints of EPS: Table 16. Dose Groups Placebo Risperidone Tablets 2 mg Risperidone Tablets 6 mg Risperidone Tablets 10 mg Risperidone Tablets 16 mg Parkinsonism 1.2 0.9 1.8 2.4 2.6 EPS Incidence 13% 17% 21% 21% 35% Similar methods were used to measure extrapyramidal symptoms (EPS) in an 8-week trial comparing 5 fixed doses of risperidone tablets (1, 4, 8, 12, and 16 mg/day): Table 17. Dose Groups Risperidone Tablets 1 mg Risperidone Tablets 4 mg Risperidone Tablet s 8 mg Risperidone Tablets 12 mg Risperidone Tablets 16 mg Parkinsonism 0.6 1.7 2.4 2.9 4.1 EPS Incidence 7% 12% 17% 18% 20% Dystonia Class Effect: Symptoms of dystonia, prolonged abnormal contractions of muscle groups, may occur in susceptible individuals during the first few days of treatment. Dystonic symptoms include: spasm of the neck muscles, sometimes progressing to tightness of the throat, swallowing difficulty, difficulty breathing, and/or protrusion of the tongue. While these symptoms can occur at low doses, they occur more frequently and with greater severity with high potency and at higher doses of first generation antipsychotic drugs. An elevated risk of acute dystonia is observed in males and younger age groups. Other Adverse Reactions Adverse event data elicited by a checklist for side effects from a large study comparing 5 fixed doses of risperidone tablets (1, 4, 8, 12, and 16 mg/day) were explored for dose-relatedness of adverse events. A Cochran-Armitage Test for trend in these data revealed a positive trend (p<0.05) for the following adverse reactions: somnolence, vision abnormal, dizziness, palpitations, weight increase, erectile dysfunction, ejaculation disorder, sexual function abnormal, fatigue, and skin discoloration. Changes in Body Weight Weight gain was observed in short-term, controlled trials and longer-term uncontrolled studies in adult and pediatric patients [see Warnings and Precautions (5.5) , Adverse Reactions (6) , and Use in Specific Populations (8.4) ]. Changes in ECG Parameters Between-group comparisons for pooled placebo-controlled trials in adults revealed no statistically significant differences between risperidone and placebo in mean changes from baseline in ECG parameters, including QT, QTc, and PR intervals, and heart rate. When all risperidone tablets doses were pooled from randomized controlled trials in several indications, there was a mean increase in heart rate of 1 beat per minute compared to no change for placebo patients. In short-term schizophrenia trials, higher doses of risperidone (8-16 mg/day) were associated with a higher mean increase in heart rate compared to placebo (4-6 beats per minute). In pooled placebo-controlled acute mania trials in adults, there were small decreases in mean heart rate, similar among all treatment groups. In the two placebo-controlled trials in children and adolescents with autistic disorder (aged 5 – 16 years) mean changes in heart rate were an increase of 8.4 beats per minute in the risperidone tablets groups and 6.5 beats per minute in the placebo group. There were no other notable ECG changes. In a placebo-controlled acute mania trial in children and adolescents (aged 10 – 17 years), there were no significant changes in ECG parameters, other than the effect of risperidone tablets to transiently increase pulse rate (< 6 beats per minute). In two controlled schizophrenia trials in adolescents (aged 13 – 17 years), there were no clinically meaningful changes in ECG parameters including corrected QT intervals between treatment groups or within treatment groups over time. 6.2 Postmarketing Experience The following adverse reactions have been identified during postapproval use of risperidone. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. These adverse reactions include: alopecia, anaphylactic reaction, angioedema, atrial fibrillation, cardiopulmonary arrest, catatonia, diabetic ketoacidosis in patients with impaired glucose metabolism, dysgeusia, hypoglycemia, hypothermia, ileus, inappropriate antidiuretic hormone secretion, intestinal obstruction, jaundice, mania, pancreatitis, pituitary adenoma, precocious puberty, pulmonary embolism, QT prolongation, sleep apnea syndrome, somnambulism, Stevens-Johnson syndrome and toxic epidermal necrolysis (SJS/TEN), sudden death, thrombocytopenia, thrombotic thrombocytopenic purpura, urinary retention, and water intoxication. Postmarketing cases of extrapyramidal symptoms (dystonia and dyskinesia) have been reported in patients concomitantly taking methylphenidate and risperidone when there was an increase or decrease in dosage, initiation, or discontinuation of either or both medications.