Methamphetamine (USAN) (play /ˌmɛθæmˈfɛtəmiːn/), also known as metamfetamine (INN),[2] meth, ice, speed, crystal, glass, tik, N-methylamphetamine, methylamphetamine, and desoxyephedrine, is a psychostimulant of the phenethylamine and amphetamine class of psychoactive drugs.
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Katy Perry attends the European premiere of Katy Perry: «Part Of Me 3D» at Empire Leicester Square on July 3, 2012 in London, England. (Photo by Mike Marsland)