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Systematic (IUPAC) name
CAS number 143-52-2
ATC code  ?
PubChem 5359353
Chemical data
Formula C18H21NO3 
Mol. mass 299.364 g/mol
Synonyms Metopon, 5β-methyl-7,8-dihydromorphin-6-one
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion  ?
Therapeutic considerations
Pregnancy cat.


Legal status
Routes  ?

Metopon (5-methylhydromorphone hydrochloride) is an opiate analogue that is a methylated derivative of hydromorphone which was invented in 1948 as an analgesic. [1]

Metopon is sometimes used in medicine, but although longer acting than hydromorphone, metopon is less potent and has poor oral bioavailability, so generally has few advantages to distinguish it from other, more commonly used opioid analgesics. [2] It has similar side effects to other opiates, which include itching, nausea and respiratory depression.

CAS number 124-92-5 (Metopon hydrochloride)


  1. ^ Eddy NB. Pharmacology of Metopon and other new analgesic opium derivatives. Annals of the New York Academy of Sciences. 1948; 51(1):51–58.
  2. ^ McLaughlin JP, Nowak D, Sebastian A, Schultz AG, Archer S, Bidlack JM. Metopon and two unique derivatives: affinity and selectivity for the multiple opioid receptors. European Journal of Pharmacology. 1995 Dec 27;294(1):201-6.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Metopon". A list of authors is available in Wikipedia.
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