Methamtamine (contracted from N-methylamtamine) is a potent central nervous system (CNS) stimulant that is mainlyused as a recreational drug and less commonly as a second-tment for attention deficit hyperactivity disorder andobesity. It has many nicknames—, crank, chalk or speed being the most common.Â

Most of the pleasurable effects of methamtamine are believed to result from the release of very high levels of theneurotransmitter . is involved in motivation, the experience of pleasure, and motor function, and is a common mechanism of action for most drugs of abuse.