Grapefruit Juice (GFJ)- I'd toyed with the idea of employing grapefruit juice for a long period but have read blended experiences. A short while ago I study that it isn't going to inhibit CYP2D6 but rahter 3A4 which is responsible for conversion of codeine into norcodeine. In idea by inhibiting 3A4 you allow additional codeine for 2D6 to turn into