Methamphetamine, also known as metamfetamine (INN), dextromethamphetamine, methylamphetamine, N-methylamphetamine, and desoxyephedrine) is a psychoactive stimulant drug. It increases alertness and energy, and in high doses, can induce euphoria, enhance self-esteem, and increase sexual pleasure.
Methamphetamine has high potential for abuse, activating the psychological reward system by increasing levels of dopamine, norepinephrine and serotonin in the brain. Methamphetamine is FDA approved in the United States for the treatment of ADHD and exogenous obesity, under the trademark name Desoxyn.
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drugabuse.gov Wikipedia - Methamphetamine