Definition of designer drug Designer drug

We found 2 definitions of designer drug from 2 different sources.

What does designer drug mean?

Noun
designer drug - a psychoactive drug deliberately synthesized to avoid anti-drug laws; mimics the effects of a banned drug; law was revised in 1986 to ban designer drugs

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designer drug (Noun)
A drug specifically developed to replace an illegal recreational drug so as to circumvent existing drug laws, usually by modifying its molecular structure.