Tags: Drug.
Ciprefadol is an opioid analgesic that is an isoquinoline derivative most closely related to cyclazocine and picenadol with a number of other related compounds known. Ciprefadol is a mixed agonist–antagonist at μ-opioid receptors and can partly block the effects of morphine at low doses though at higher doses it acts more like a full agonist. It is also a potent κ-opioid agonist unlike the corresponding N-methyl and N-phenethyl derivatives which are reasonably μ-selective agonists.
