Medical Definition of amphetamine
: a racemic sympathomimetic amine C9H13N or one of its derivatives (as dextroamphetamine or methamphetamine) frequently abused as a stimulant of the central nervous system but used clinically especially in the form of its sulfate C9H13N·H2SO4 to treat attention deficit disorder and narcolepsy and formerly as a short-term appetite suppressant—see benzedrine
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