The brand name for the generic drug methylphenidate is Ritalin. It is a member of the piperidine and phenethylamine class of central nervous system stimulants. Treatment for narcolepsy and attention deficit hyperactivity disorder with Ritalin tablets is effective. So buy Ritalin online without a prescription in USA. In the US, it is the first-line treatment for ADHD. Ritalin prevents neurons from reabsorbing norepinephrine and dopamine.