Ritalin , generically known as methylphenidate, is a medication that acts as a central nervous system stimulant (CNS stimulant) to help manage Attention Deficit Hyperactivity Disorder (ADHD). In addition to ADHD, Ritalin is also effective in treating narcolepsy. It is important to note that Ritalin has a potential for habit formation. Consult your doctor if you have a history of drug or alcohol addiction.