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Systematic (IUPAC) name
4,5α-epoxy-7α-(1-hydroxy-1-methylbutyl)-6-methoxy -17-methyl-6,14-endo-ethenomorphinan-3-yl acetate
Legal status
Legal status
CAS Number 25333-77-1
ATC code none
PubChem CID 62795
Chemical data
Formula C27H35NO5
Molar mass 453.57 g/mol[[Script error: No such module "String".]]
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Acetorphine is a potent analgesic drug (painkiller), up to 8700 times stronger than morphine by weight.[1] It is a derivative of the more well-known opioid etorphine, which is used as a very potent veterinary painkiller and anesthetic medication, primarily for the sedation of large animals such as elephants, giraffes and rhinos.

Acetorphine was developed in 1966 by the Reckitt research group that developed etorphine. Acetorphine was developed for the same purpose as etorphine itself, namely as a strong tranquillizer for use in immobilizing large animals in veterinary medicine. However despite showing some advantages over etorphine (for instance producing less toxic side effects in giraffes), acetorphine was never widely adopted for veterinary use, and etorphine (along with other tranquillizers such as carfentanil and azaperone) remains the drug of choice in this application.

Acetorphine is a Schedule I controlled substance in the United States. Its DEA Administrative Controlled Substances Control Number is 9319 and the one salt in use, acetorphine hydrochloride, has a freebase conversion ratio of 0.93


  1. Bentley KW, Hardy DG. "Novel analgesics and molecular rearrangements in the morphine-thebaine group. 3. Alcohols of the 6,14-endo-ethenotetrahydrooripavine series and derived analogs of N-allylnormorphine and -norcodeine." Journal of the American Chemical Society. 1967 Jun 21;89(13):3281-92. PMID 6042764

UN Office on Drugs and Crime. Bulletin on Narcotics 1968, page 51-52


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