Ritalin , generically known as methylphenidate, is a medication that acts as a central nervous system stimulant to help manage Attention Deficit Hyperactivity Disorder (ADHD). It makes certain chemical changes in the brain and nerves, resulting in better control of hyperactivity and impulse control. In addition to ADHD, Ritalin is also effective in treating narcolepsy. Ritalin may exacerbate or trigger new psychosis, especially in those with a h...