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desvenlafaxine will raise the stage or result of codeine by influencing hepatic enzyme CYP2D6 metabolism. Use Caution/Keep an eye on. Desvenlafaxine inhibits CYP2D6; with increased desvenlafaxine doses (ie, four hundred mg) reduce the CYP2D6 substrate dose by as much as 50%; no dosage adjustment wanted with desvenlafaxine doses 7 consecutive days q