nal·trex·one (nāl-trěk'sōn) n. A drug, C20H23NO4, used as an antagonist to narcotic drugs.
[Blend of nal(o)xone and tre- (probably alteration of tri-, after the three carbon atoms in the propyl group that distinguishes it from naloxone, of which it is a congener).]
Main Entry: nal·trex·one Pronunciation: nal-'trek-"sOn Function: noun : a synthetic opiate antagonist administered in the form of itshydrochloride C20H23NO4·HCl especially to maintain detoxified opiate addicts in a drug-free state
naltrexone nal·trex·one (nāl-trěk'sōn) n. An endorphin and narcotic antagonist. It is devoid of pharmacologic action when administered in the absence of narcotics.