an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
"The doctor warned that while methamphetamine was originally prescribed as a crystalline powder to treat narcolepsy and curb hunger, its potential for abuse made it strictly illegal without supervision."
A highly addictive phenethylamine stimulant drug, similar to cocaine. Its systematic (IUPAC) name is (S)-N-methyl-1-phenylpropan-2-amine.
"The user was arrested for possession of methamphetamine after police found the white crystalline powder in his car during a routine traffic stop."