What are the side effects of Concerta?

Concerta is a brand-name for the drug methylphenidate. Methylphenidate is a central nervous stimulant; in most countries, methylphenidate is a controlled substance and carries penalties for obtaining or taking without a prescription from a licensed doctor.

Concerta can cause an allergic reaction in individuals, even if the past they have had no reactions: symptoms include hives, difficulty breathing, swelling of the face, tongue, lips, or throat. In the event of an allergic reaction, seek medical help immediately.

Stop taking Concerta and consult your physician immediately if you have a serious side effect such as:

• fast, pounding, or uneven heartbeat;
• fainting, or feeling light-heated;
• severe headache, blurred vision, trouble concentrating, chest pain, numbness, or seizure (signs of increased blood pressure)
• easy bruising, or purple spots on the skin
• shaking, restlessness, hallucinations, unusual behavior, or muscle twitches

Less serious side effects that have been reported include: headache or dizziness, sleep problems, dry mouth, sweating, mild skin rash, numbness, loss of appetite, and weight loss.

Please see related questions for what Concerta is used for, drug interactions, and things to avoid while taking Concerta.