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After removing the patch (fentenal)how long is the medicine in your body?

Responses (1)

suzanne66 6 Feb 2010

After removing the patch blood levels of Fentanyl decline gradually. Levels fall about 50% in approximately 17 (range 13 to 22) hours.

See: https://www.drugs.com/pro/fentanyl.html (view under pharmacology)

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