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desvenlafaxine will enhance the level or outcome of codeine by influencing hepatic enzyme CYP2D6 metabolism. Use Warning/Keep an eye on. Desvenlafaxine inhibits CYP2D6; with higher desvenlafaxine doses (ie, four hundred mg) lessen the CYP2D6 substrate dose by as much as 50%; no dosage adjustment essential with desvenlafaxine doses seven consecutive