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desvenlafaxine will improve the degree or impact of codeine by affecting hepatic enzyme CYP2D6 metabolism. Use Caution/Keep an eye on. Desvenlafaxine inhibits CYP2D6; with bigger desvenlafaxine doses (ie, four hundred mg) minimize the CYP2D6 substrate dose by around fifty%; no dosage adjustment wanted with desvenlafaxine doses 7 consecutive times q