Club drug: A drug such as MDMA (Ecstasy), GHB, Rohypnol, ketamine, methamphetamine, and LSD that is used by young adults at all-night dance parties such as "raves" or "trances," dance clubs, and bars.
Use of club drugs can cause serious health problems and, in some cases, death. No club drug is benign. Chronic abuse of MDMA, for example, appears to produce long-term damage to serotonin-containing neurons in the brain. Because some club drugs are colorless, tasteless, and odorless, they can be added unobtrusively to beverages by individuals who want to intoxicate or sedate others. In recent years, there has been an increase in reports of club drugs used to commit sexual assaults.