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Medical Definition of Designer drugs
1. Drugs designed and synthesised, often for illegal street use, by modification of existing drug structures (e.g., amphetamines). Of special interest are mptp (a reverse ester of meperidine), mda (3,4-methylenedioxyamphetamine), and mdma (3,4-methylenedioxymethamphetamine). Many drugs act on the aminergic system, the physiologically active biogenic amines. (12 Dec 1998)