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.
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