An orally active narcotic antagonist; devoid of pharmacologic action when administered in the absence of narcotics.
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nal·trex·one nal-'trek-.sōn n a synthetic opiate antagonist administered in the form of its hydrochloride C20H23NO4·HCl esp. to maintain detoxified opiate addicts in a drug-free state
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n.
a narcotic antagonist drug that is used in the maintenance treatment of heroin- and other opiate-dependent patients. It is administered by mouth. Possible side-effects include abdominal cramps, nausea and vomiting, sleep difficulties, and dizziness. Trade name: Nalorex.
Medical dictionary. 2011.