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desvenlafaxine will improve the level or effect of codeine by impacting hepatic enzyme CYP2D6 metabolism. Use Warning/Check. Desvenlafaxine inhibits CYP2D6; with better desvenlafaxine doses (ie, four hundred mg) reduce the CYP2D6 substrate dose by approximately fifty%; no dosage adjustment necessary with desvenlafaxine doses seven consecutive times