I took 50mg of dexamphetamine about 3 hours ago and another 10mg about an hour and a half ago. I?ve got 600mg codeine for the comedown. I?ve heard MDMA is a potent CYP2D6 inhibitor and so codeine will noy work after taking MDMA. I don?t know if dexamphetamine also has this effect but if anyone has read it does please send me an article or report describing it. If it doesn?t have this effect, how long should I wait for the stimulation to die so I can take the codeine and actually feel something from it. I?ve been taking codeine almost every day for the past two weeks and been using regularly (as in 3 or more times a week) for about 3 months so I have a high tolerance, so if that combined with the after effects of dexamphetamine is going to have some kind of synergistic effect then tell me and I?ll wait till tomorrow.