Depending what type of for you take Fentanyl in, it can vary. I'm on Actiq 1600 mcg's, it has a half life of 7 hours. Multiply 7 hours by 7 half lives you come up with 49 hours. So, since you last dose of Actiq, it would take 49 hours to clear your system. Give or take a few, depends on your metabolism. If you have access to read this. just google your questions, that's where I get my info.
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