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desvenlafaxine will increase the degree or influence of codeine by influencing hepatic enzyme CYP2D6 metabolism. Use Warning/Check. Desvenlafaxine inhibits CYP2D6; with increased desvenlafaxine doses (ie, four hundred mg) decrease the CYP2D6 substrate dose by around fifty%; no dosage adjustment needed with desvenlafaxine doses seven consecutive tim