Diminution des concentrations plasmatiques de fentanyl par augmentation de son métabolisme hépatique par la rifampicine.Re: Really Freaked Out!! Fentanyl OD or W/D, Undecided! Require Suggestions!! I am somewhat anxious for yourself. To me it looks like you might not be that opiod tolerant and you also are experiecing some side effects that plent… Read More