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Oxymorphazone

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Oxymorphazone

Not to be confused with Oxymorphone.

Oxymorphazone is an opioid analgesic drug related to oxymorphone. Oxymorphazone is a potent and long acting μ-opioid agonist which binds irreversibly to the receptor, forming a covalent bond which prevents it from detaching once bound.[1][2] This gives it an unusual pharmacological profile, and while oxymorphazone is only around half the potency of oxymorphone, with higher doses the analgesic effect becomes extremely long lasting, with a duration of up to 48 hours.[3] However, tolerance to analgesia develops rapidly with repeated doses,[4][5][6] as chronically activated opioid receptors are rapidly internalised by β-arrestins, similar to the results of non-covalent binding by agonists with extremely high binding affinity such as lofentanil.[7][8]

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