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desvenlafaxine will raise the level or result of codeine by influencing hepatic enzyme CYP2D6 metabolism. Use Warning/Observe. Desvenlafaxine inhibits CYP2D6; with better desvenlafaxine doses (ie, 400 mg) lessen the CYP2D6 substrate dose by nearly fifty%; no dosage adjustment needed with desvenlafaxine doses 7 consecutive times immediately previous