naltrexone

noun Pharmacology.

1. a nonaddictive substance, C20H23NO4, used in the treatment of heroin addiction and opiate overdose.

noun

1. a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction

n.

1. An endorphin and narcotic antagonist. It is devoid of pharmacologic action when administered in the absence of narcotics.