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desvenlafaxine will boost the stage or outcome of codeine by impacting hepatic enzyme CYP2D6 metabolism. Use Warning/Observe. Desvenlafaxine inhibits CYP2D6; with greater desvenlafaxine doses (ie, four hundred mg) minimize the CYP2D6 substrate dose by as many as fifty%; no dosage adjustment essential with desvenlafaxine doses seven consecutive days