methamphetamine

n. synthetic drug that acts rapidly and has effects that last longer than amphetamine (used illegally)

Methamphetamine (methylamphetamine or desoxyephedrine), popularly shortened to meth and also nicknamed "ice", is a psychostimulant and sympathomimetic drug. The dextrorotatory isomer dextromethamphetamine can be prescribed to treat attention-deficit hyperactivity disorder, though unmethylated amphetamine is more commonly prescribed. Also, narcolepsy, and obesity can be treated by the aformentioned isomer under the brand name Desoxyn. It is considered a second line of treatment, used when amphetamine and methylphenidate cause the patient too many side effects. It is only recommended for short term use (~6 weeks) in obesity patients because it is thought that the anoretic effects of the drug are short lived and produce tolerance quickly, whereas the effects on CNS stimulation are much less susceptable to tolerance. It is also used illegally for weight loss and to maintain alertness, focus, motivation, and mental clarity for extended periods of time, and for recreational purposes. "Crystal meth" refers to the , smokeable form of the drug and is not used for the drug in pill or powdered form.
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Noun
1. amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
(synonym) methamphetamine hydrochloride, Methedrine, meth, deoxyephedrine, chalk, chicken feed, crank, glass, ice, shabu, trash
(hypernym) amphetamine, pep pill, upper, speed