- 1an illegal substance that some people smoke, inject, etc. for the physical and mental effects it has He does not smoke or take drugs. teenagers experimenting with drugs I found out Steve was on drugs (= regularly used drugs). drug and alcohol abuse a hard (= very harmful) drug such as heroin a soft drug (= one that is not considered very harmful) Drugs have been seized with a street value of two million dollars. She was a drug addict (= could not stop using drugs). She was found to be under the influence of drugs. He was charged with pushing drugs (= selling them). (informal) I don't do drugs (= use them). drug rehabilitation
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- 2a substance used as a medicine or used in a medicine prescribed drugs The doctor put me on a course of pain-killing drugs. drug companies The drug has some bad side effects. see designer drug
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