Methylphenidateside effects
8 HR methylphenidate hydrochloride 20 MG Extended Release Oral Tablet
Adverse reactions
The following are discussed in more detail in other sections of the labeling: Abuse, Misuse, and Addiction Hypersensitivity Reactions Hypertensive crisis with Concomitant Use of Monoamine Oxidase Inhibitors Risks to Patients with Serious Cardiac Disease Increased Blood Pressure and Heart Rate Psychiatric Adverse Reactions Priapism Peripheral Vasculopathy, including Raynaud’s Phenomenon Long-term Suppression of Growth in Pediatric Patients Acute Angle Closure Glaucoma Increased Intraocular Pressure and Glaucoma Motor and Verbal Tics, and Worsening of Tourette's Syndrome The following adverse reactions associated with the use of methylphenidate were identified in clinical trials, spontaneous reports, and literature. Because these reactions were reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency reliably or to establish a causal relationship to drug exposure. Adverse Reactions Reported with Methylphenidate Hydrochloride Extended-Release Tablets
Infections and Infestations: nasopharyngitis
Blood and the Lymphatic System Disorders: leukopenia, thrombocytopenia, anemia
Immune System Disorders: hypersensitivity reactions, including angioedema and anaphylaxis
Metabolism and Nutrition Disorders: decreased appetite, reduced weight gain, and suppression of growth during prolonged use in pediatric patients
Psychiatric Disorders: insomnia, anxiety, restlessness, agitation, psychosis (sometimes with visual and tactile hallucinations), depressed mood
Nervous System Disorders: headache, dizziness, tremor, dyskinesia including choreoathetoid movements, drowsiness, convulsions, cerebrovascular disorders (including vasculitis, cerebral hemorrhages and cerebrovascular accidents), serotonin syndrome in combination with serotonergic drugs
Eye Disorders: blurred vision, difficulties in visual accommodation
Cardiac Disorders: tachycardia, palpitations, increased blood pressure, arrhythmias, angina pectoris
Respiratory, Thoracic and Mediastinal Disorders: cough
Gastrointestinal Disorders: dry mouth, nausea, vomiting, abdominal pain, dyspepsia
Hepatobiliary Disorders: abnormal liver function, ranging from transaminase elevation to severe hepatic injury
Skin and Subcutaneous Tissue Disorders: hyperhidrosis, pruritus, urticaria, exfoliative dermatitis, scalp hair loss, erythema multiforme rash, thrombocytopenic purpura
Musculoskeletal and Connective Tissue Disorders: arthralgia, muscle cramps, rhabdomyolysis
Investigations: weight loss (adult ADHD patients) Additional Adverse Reactions Reported with Other Methylphenidate-Containing Products The list below shows adverse reactions reported with other methylphenidate-containing products.
Blood and Lymphatic Disorders: pancytopenia
Immune System Disorders: hypersensitivity reactions such as auricular swelling, bullous conditions, eruptions, exanthemas
Psychiatric Disorders: affect lability, mania, disorientation and libido changes
Nervous System Disorders: migraine
Eye Disorders: diplopia, mydriasis
Cardiac Disorders: sudden cardiac death, myocardial infarction, bradycardia, extrasystole
Vascular Disorders: peripheral coldness, Raynaud's phenomenon
Respiratory, Thoracic and Mediastinal Disorders: pharyngolaryngeal pain, dyspnea
Gastrointestinal Disorders: diarrhea, constipation
Skin and Subcutaneous Tissue Disorders: angioneurotic edema, erythema, fixed drug eruption
Musculoskeletal, Connective Tissue and bone Disorders: myalgia, muscle twitching
Renal and Urinary Disorders: hematuria
Reproductive System and Breast Disorders: gynecomastia
General Disorders: fatigue, hyperpyrexia
Urogenital Disorders: priapism Common adverse reactions: tachycardia, palpitations, headache, insomnia, anxiety, hyperhidrosis, weight loss, decreased appetite, dry mouth, nausea, and abdominal pain To report SUSPECTED ADVERSE REACTIONS, contact Granules Pharmaceuticals Inc. at 1-877-770-3138 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Text above is quoted in full from the FDA-approved drug label published by openFDA, effective August 18, 2026. Matched to this product by RxNorm code. Cross-references to other sections of the full prescribing information have been removed, since they point to a document not shown here. Nothing else is changed: no sentence is shortened, reworded or summarised.
Contraindications
Methylphenidate Hydrochloride Extended-Release Tablets are contraindicated in patients: Known to be hypersensitive to methylphenidate or other components of methylphenidate hydrochloride extended-release tablets. Hypersensitivity reactions such as angioedema and anaphylactic reactions have been reported in patients treated with methylphenidate. Receiving concomitant monoamine oxidase inhibitors (MAOIs), or those that discontinued treatment with an MAOI in the last 14 days, because of the risk of hypertensive crises. Patients with pheochromocytoma or a history of pheochromocytoma. Serious reactions, including elevated blood pressure and tachyarrhythmia, have been reported in patients with pheochromocytoma or a history of pheochromocytoma who received an amphetamine product. Methylphenidate hydrochloride extended-release tablets are contraindicated in patients: With known hypersensitivity to methylphenidate or other product components of Methylphenidate hydrochloride extended-release tablets. Receiving concomitant monoamine oxidase inhibitor (MAOI), or use of an MAOI within the preceding 14 days. Patients with pheochromocytoma or a history of pheochromocytoma
Text above is quoted in full from the FDA-approved drug label published by openFDA, effective August 18, 2026. Matched to this product by RxNorm code. Cross-references to other sections of the full prescribing information have been removed, since they point to a document not shown here. Nothing else is changed: no sentence is shortened, reworded or summarised.
This page reproduces regulatory text for reference. It is not medical advice, and KenyRx is not a pharmacy or a prescriber. Talk to a doctor or pharmacist about whether a medicine is right for you.
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