capable of negatively regulating P450 inhibitor An enzyme inhibitor that interferes with the activity of cytochrome P450 involved in catalysis of organic substances. CHEBI:50183 CYP2D6 inhbitor CYP2D6 inhbitors P450 inhibitors cytochrome P450 inhibitor cytochrome P450 inhibitors EC 1.* (oxidoreductase) inhibitor EC 1.14.14.1 (unspecific monooxygenase) inhibitor cytochrome P450 activation