How long will fentanyl stay in your system?

Answer:
It depends entirely on the dose, how long the person has been using it, and the person's own body. If you're like me and have been using high doses for years, it can take weeks to leave the system, as your body isn't very happy about it. Since Fentanyl is only prescribed for long term patients, this is the most common, though the literature will tell you the excretion process from the body is only several days.
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