hard drug

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An intensely addictive substance of abuse that may compel its user to commit crimes to obtain the drug—e.g., crack cocaine, heroin

hard drug

Any intensely addictive substance of abuse that may compel its user to commit crimes to obtain the drug–eg, crack cocaine, heroin. See Gateway drug.

hard drug

In biochemistry, a drug that is not metabolized by the cytochrome P450 system in the liver, or transported by intestinal P-glycopeptide.
See also: drug