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desvenlafaxine will improve the amount or result of codeine by influencing hepatic enzyme CYP2D6 metabolism. Use Caution/Watch. Desvenlafaxine inhibits CYP2D6; with better desvenlafaxine doses (ie, 400 mg) minimize the CYP2D6 substrate dose by as much as fifty%; no dosage adjustment desired with desvenlafaxine doses 7 consecutive days straight away