Drug Gene Type Source fentanyl OPRM1 Ki=0.0029(uM) D1 PubChem fentanyl MAOA Ki=5.462(uM) D1 PubChem fentanyl MAOB Ki=5.462(uM) D1 PubChem fentanyl AR Potency=21.1317(uM) D1 PubChem fentanyl AR Ratio Potency (uM)=22.1476(uM) D1 PubChem fentanyl AR Potency=23.9145(uM) D1 PubChem fentanyl OPRM1 - D1 PubChem