a substance used by teenagers and young adults at bars, dance clubs, or all-night parties known as raves. Club drugs include MDMA (Ecstasy); GHB, flunitrazepam, and ketamine (see also date-rape drug); methamphetamine; and LSD. Chronic abuse can have severe physiological or psychological repercussions (or both) and, when combined with the intake of alcohol, might also prove fatal.