, ritonavir) or discontinuation of the cytochrome P450 3A4 inducer including rifampin, carbamazepine, and phenytoin, may possibly cause a rise in codeine plasma concentrations with subsequently greater metabolism by cytochrome P450 2D6, causing bigger morphine levels, which could boost or prolong adverse reactions and may induce probably deadly respiratory depression. https://akorn-codeine91001.blogpixi.com/32563263/not-known-factual-statements-about-akorn-promethazine-codeine