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Systematic (IUPAC) name
6,7,8,14-tetrahydro- N-(Cyclopropylmethyl)- 7α-(1-hydroxy-1-methylethyl)- 6,14-endo-ethenonororipavine
Legal status
Legal status
CAS Number 4406-22-8
ATC code none
PubChem CID 544534
ChemSpider 16735758
Chemical data
Formula C26H33NO4
Molar mass 423.545 g/mol[[Script error: No such module "String".]]
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Cyprenorphine (M-285) is a drug which is an opioid derivative. It is related to more well-known opioids such as buprenorphine, which is used as an analgesic and for the treatment of opioid addiction, and diprenorphine, which is used as an antidote to reverse the effects of other opioids.

Cyprenorphine has mixed agonist-antagonist effects at opioid receptors, like those of buprenorphine. However the effects of cyprenorphine are somewhat different, as it produces pronounced dysphoric and hallucinogenic effects which limit its potential use as an analgesic.[1][2]


  1. Bentley KW, Boura ALA, Fitzgerald AE, Hardy DG, McCoubrey A, Aikman ML, Lister RE. Compounds Possessing Morphine-Antagonizing or Powerful Analgesic Effects. Nature, 1965; (206):102-103.
  2. Lowe G, Williams DI. Some Effects of a Hallucinogenic Compound (Cyprenorphine Hydrochloride; M 285) on the Light Reinforced Behaviour of Rats. Nature. 1969; (224):1226.