any of various narcotic or hallucinogenic substances manufactured illegally from a range of chemicals
2. medicine
a drug designed to act on a specific molecular target
designer drug in American English
US
a drug that has been developed by changing slightly the chemical structure of an existing drug, as to evade legal prohibition or to produce certain desired effects
Examples of 'designer drug' in a sentence
designer drug
We will be able to pick up the new designer drugs.
The Sun (2012)
And soon their chief informs them they are being sent undercover to find the source of a new designer drug.