, ritonavir) or discontinuation of the cytochrome P450 3A4 inducer like rifampin, carbamazepine, and phenytoin, could end in a rise in codeine plasma concentrations with subsequently higher metabolism by cytochrome P450 2D6, resulting in increased morphine concentrations, which could enhance or extend adverse reactions and may cause probably lethal respiratory https://damienulepc.blogocial.com/an-unbiased-view-of-akorn-promethazine-codeine-68119003