Not sure how you were taking the fentanyl. If tablet form, you must wait at least 24 hours and be in moderate withdrawal not only for suboxone to work, but, so you won't go into precipitated withdrawal if the fentanyl is still on your receptor sites in the brain. Google the COWS sheet, this sheet is the Clinical Opiate Withdrawal Scale that gauges how far you are in withdrawal and this will give you and idea of what to expect during withdrawal as well. Some doctors make patients wait 36 hours and I think that it depends on how much opiate they were taking and for how long. If you are going to start suboxone and haven't started to withdraw yet, make sure you have some advil and imodium ad around to make it a bit easier.
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