Ritalin is a brand name for the prescription drug methylphenidate, which is used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. It is a central nervous system stimulant that affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control.
It is not legal to purchase Ritalin or any prescription medication online without a valid prescription from a licensed healthcare provider. Doing so may be dangerous and is considered illegal. Additionally, the safety and efficacy of such drugs obtained from online sources cannot be guaranteed.