What are the side effects of ritalin (methylphenidate)?

Well tolerated: Ritalin (methylphenidate) is generally quite well-tolerated in most patients. Adverse events can vary someone between children and adults. These can include nervousness, insomnia, , loss of appetite, abdominal pain, weight loss during prolonged therapy, and an increase in heart rate.

Methylphenidate: Ritalin (methylphenidate) side-effects include nervousness, insomnia, nausea/vomiting, loss of appetite, diarrhea, heartburn, headache, muscle tightness, dry mouth, restlessness, tingling of hands/feet, decrease sexual desire, painful menstruation, chest pain, shortness of breath, heart beats faster, blurred vision, agitation, seizures, psychosis, mood changes, tics, rash.