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desvenlafaxine will improve the degree or result of codeine by affecting hepatic enzyme CYP2D6 metabolism. Use Warning/Monitor. Desvenlafaxine inhibits CYP2D6; with greater desvenlafaxine doses (ie, four hundred mg) lessen the CYP2D6 substrate dose by nearly fifty%; no dosage adjustment required with desvenlafaxine doses seven consecutive times str