Grapefruit Juice (GFJ)- I'd toyed with the idea of working with grapefruit juice for a long time but have go through blended stories. Not too long ago I browse that it will not inhibit CYP2D6 but rahter 3A4 which is answerable for conversion of codeine into norcodeine. In concept by inhibiting 3A4 you allow more codeine for 2D6 to develop into morp