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Metadate ER Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Metadate ER (methylphenidate hydrochloride) Tablet Extended Release is used to treat attention deficit disorder (ADD), attention deficit hyperactivity disorder (ADHD), and narcolepsy. It is a central nervous system (CNS) stimulant. Common side effects include headache, stomach pain, loss of appetite, trouble sleeping, dizziness, nausea, vomiting, lightheadedness, irritability, nervousness, blurred vision, dry mouth, constipation or (rarely) drowsiness.
The average dose of Metadate ER is 20 to 30 mg daily, divided into 2 or 3 doses, taken 30 to 45 minutes before meals. Some patients may require 40 to 60 mg/day, and in others 10 to 15 mg daily is adequate. Metadate ER may interact with blood thinners, clonidine, dobutamine, epinephrine, isoproterenol, cold/allergy medicine that contains phenylephrine potassium citrate, sodium acetate, sodium bicarbonate, citric acid, potassium citrate, sodium citrate and citric acid, medications to treat high or low blood pressure, stimulant medications or diet pills, seizure medicine, or antidepressants. Tell your doctor all medications you are taking. Metadate ER should be used only when prescribed during pregnancy. It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.
Our Metadate ER (methylphenidate hydrochloride) Tablet Extended Release Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Metadate ER in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop taking methylphenidate and call your doctor at once if you have a serious side effect such as:
- fast, pounding, or uneven heartbeats;
- feeling like you might pass out;
- fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;
- aggression, restlessness, hallucinations, unusual behavior, or motor tics (muscle twitches);
- easy bruising, purple spots on your skin; or
- dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats, seizure).
Less serious side effects may include:
- stomach pain, nausea, vomiting, loss of appetite;
- vision problems, dizziness, mild headache;
- sweating, mild skin rash;
- numbness, tingling, or cold feeling in your hands or feet;
- nervous feeling, sleep problems (insomnia); or
- weight loss.
Read the entire detailed patient monograph for Metadate ER (Methylphenidate Hydrochloride Extended Release Tablet) »
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Metadate ER FDA Prescribing Information: Side Effects
Nervousness and insomnia are the most common adverse reactions but are usually controlled by reducing dosage and omitting the drug in the afternoon or evening. Other reactions include hypersensitivity (including skin rash, pruritus, urticaria, fever, arthralgia, exfoliative dermatitis, erythema multiforme with histopathological findings of necrotizing vasculitis, and thrombocytopenic purpura); anorexia; nausea; dizziness; palpitations; headache; dyskinesia; drowsiness; blood pressure and pulse changes, both up and down; tachycardia; angina; cardiac arrhythmia; abdominal pain; weight loss during prolonged therapy. There have been rare reports of Tourette's syndrome and obsessive-compulsive disorder. Toxic psychosis has been reported. Although a definite causal relationship has not been established, the following have been reported in patients taking this drug: instances of abnormal liver function, ranging from transaminase elevation to hepatic coma; isolated cases of cerebral arteritis and/or occlusion; leukopenia and/or anemia; transient depressed mood; aggressive behavior; a few instances of scalp hair loss. Very rare reports of neuroleptic malignant syndrome (NMS) have been received, and, in most of these, patients were concurrently receiving therapies associated with NMS. In a single report, a ten year old boy who had been taking methylphenidate for approximately 18 months experienced an NMS-like event within 45 minutes of ingesting his first dose of venlafaxine. It is uncertain whether this case represented a drug-drug interaction, a response to either drug alone, or some other cause.
In children, loss of appetite, abdominal pain, weight loss during prolonged therapy, insomnia, and tachycardia may occur more frequently; however, any of the other adverse reactions listed above may also occur.
In addition to the adverse events listed above, the following have been reported in patients receiving methylphenidate worldwide. The list is alphabetized: abnormal behavior, aggression, anxiety, cardiac arrest, depression, fixed drug eruption, hyperactivity, irritability, migraine, obsessive-compulsive disorder, peripheral coldness, Raynaud's phenomenon, reversible ischaemic neurological deficit, sudden death, suicidal behavior (including completed suicide), and thrombocytopenia. Data are insufficient to support an estimation of incidence or establish causation.
Read the entire FDA prescribing information for Metadate ER (Methylphenidate Hydrochloride Extended Release Tablet) »
Additional Metadate ER Information
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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