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(Science: chemical) derivative of noroxymorphone that is the n-cyclopropylmethyl congener of naloxone. It is a narcotic antagonist that is effective orally, longer lasting and more potent than naloxone, and has been proposed for the treatment of heroin addiction. The fDA has approved naltrexone for the treatment of alcohol dependence.

Pharmacological action: narcotic antagonists.

Chemical name: Morphinan-6-one, 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-, (5alpha)-