What is Ritalin used to treat?

Ritalin is the most widely known brand-name for methylphenidate. Methylphenidate is a central nervous system stimulant used to treat ADHD and narcolepsy.

A brand of methylphenidate in its hydrochloride form.

proprietary name (Ciba Ltd., originally in Switzerland) for drug methylphenidate hydrochloride, copyrighted 1948, years before the drug itself was marketed.