Grapefruit Juice (GFJ)- I had toyed with the thought of utilizing grapefruit juice for a long period but have study combined stories. Recently I read through that it will not inhibit CYP2D6 but rahter 3A4 which can be to blame for conversion of codeine into norcodeine. In principle by inhibiting 3A4 you permit much more codeine for 2D6 to develop i