The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with codeine are advanced, necessitating thorough thing to consider of the consequences within the parent drug, codeine, plus the Lively metabolite, morphine.The phenylephrine contained in Promethazine VC with Codeine Oral Resolution