naltrexone

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/nælˈtrɛksəʊn/US:USA pronunciation: respellingUSA pronunciation: respelling(nal trek′sōn)


WordReference Random House Unabridged Dictionary of American English © 2026
nal•trex•one  (nal trek′sōn),USA pronunciation n. [Pharm.]
  1. Drugsa nonaddictive substance, C20H23NO4, used in the treatment of heroin addiction and opiate overdose.
  • by rearrangement of parts of its chemical name 1970–75

Collins Concise English Dictionary © HarperCollins Publishers::
naltrexone /nælˈtrɛksəʊn/ n
  1. a narcotic antagonist, similar to morphine, used chiefly in the treatment of heroin addiction
Etymology: 20th Century: from N-al(lylnor)ox(ymorph)one, + the arbitrary insertion of -trex-

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