University of California, Santa Barbara

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Methamphetamines (methylamphetamine or desoxyephedrine), is a psychostimulant drug that is very closely related to an amphetamine but has a longer lasting and potentially more toxic effect on the central nervous system. Methamphetamines have an extremely high potential for abuse and addiction.

Common Names: chalk, crank, croak, crypto, crystal, fire, glass, ice, jib, meth, P, speed, tina, white cross

Appearance: Meth is usually a clear-to-white crystalline substance. It gets one of its nicknames, crystal, because of its appearance — think sea salt crystals for example.

Effects: The effects of methamphetamine include euphoria, dysophoria, increased attention, increased alertness, excessive talking, rapid speech, irritability, nervousness, anxiety, paranoia, delusions of grandeur, panic, aggressive and sometimes violent behavior, severe depression, suicidal tendencies, hyperactivity and excitability, increased sense of well-being, and emotional lability. Occasionally excessive and/or chronic use of methamphetamine can lead to amphetamine psychosis, with side effects such as hallucinations, paranoia, delusions, and thought disorder.