Not to be confused with naltrexone.
Clinical data
ATC code None
CAS Number 16676-26-9
16291-05-7 (HCl)
PubChem (CID) 5360516
ChemSpider 4514525
Chemical and physical data
Formula C21H25NO4
Molar mass 355.428 g/mol
3D model (Jmol) Interactive image

Nalmexone (INN) (code names EN-1620A, UM-592), or nalmexone hydrochloride (USAN), is a semisynthetic, opioid partial agonist or mixed agonist-antagonist with both analgesic and narcotic antagonist properties that was never marketed.[1][2][3][4] In clinical studies it was found to have comparable analgesic efficacy to morphine, though with several-fold reduced potency.[5] In addition, nalmexone's side effects, the most common of which were sleepiness and sweating, were reported to be similar to those of morphine, albeit with a noticeably higher degree of incidence.[5]


Nalmexone synthesis: Lowenstein, M. J.; Fishman, J.; 1967, U.S. Patent 3,320,262

See also


  1. Macdonald F (1997). Dictionary of Pharmacological Agents. CRC Press. p. 1395. ISBN 978-0-412-46630-4. Retrieved 11 May 2012.
  2. Casy AF, Parfitt RT (1986). Opioid Analgesics: Chemistry and Receptors. Springer. p. 55. ISBN 978-0-306-42130-3. Retrieved 11 May 2012.
  3. Loew GH, Berkowitz DS (1978). "Quantum chemical studies of N-substituent variation in the oxymorphone series of opiate narcotics". Journal of Medicinal Chemistry. 21 (1): 101–106. doi:10.1021/jm00199a018. PMID 73588.
  4. Forrest WH, Shroff PF, Mahler DL (1972). "Analgesic and other effects of nalmexone in man". Clinical Pharmacology and Therapeutics. 13 (4): 520–525. PMID 4557582.
  5. 1 2 National Research Council (U.S.). Committee on Problems of Drug Dependence; American Medical Association. Committee on Alcoholism and Drug Dependence; American Medical Association. Council on Mental Health; National Academy of Sciences (U.S.) (1969). Bulletin, problems of drug dependence. National Academies. p. 5873. NAP:10503. Retrieved 11 May 2012. Cite uses deprecated parameter |coauthors= (help)

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