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You can do the math. Fentanyl lozenges-approx. 7 hours. Duragesic takes a few hours to kick in and is supposed to last up to 72 hours (like how Oxycontin is supposed to last 12 hours) but most people find it lasts 36-60 hours. From my experience I've found fentanyl patches to last about 48-54 hours.
It can take as long as 12-18 hours for the first patch to work, so be aware of that. Some patients find that it's difficult to keep the Fentanyl patches on, so if you find that to be a problem here's an article that you may find helpful. Keeping Fentanyl patches on. VIEW 1 COMMENTS.