It takes about 12-24 hours to really start working well but it can take up to six days to really build a solid blood level. That is not to say it takes 6 days to work, just to get full benefits. you should begin to feel more comfortable within 12 hours of applying the patch. Remember after removing the patch you can still absorb the drug from the skin for up to 24 hours. In the first couple days of starting the patch watch for signs of over drowsiness and for respiratory depression.
- Fentanyl Information for Consumers
- Fentanyl Information for Healthcare Professionals (includes dosage details)
- Side Effects of Fentanyl (detailed)
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How long does it take for an upped dosage of the fentanyl patch to kick in? I upped it yesterday to?
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