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What test is used to check the level of medication in your system while using a duragesic patch?
Updated: 4/28/2022
I have been using Duragesic (fentanyl patches) for severe chronic pain caused by RSD since September 14, 2002. When my primary care doctor used a urine drug test to find out if I was really using my Duragesic patches, the test came back negative, even thoigh I really WAS using my patches. However, a blood test did show the level of fentanyl present in my blood. The funny thing is that the level of fentanyl in my blood is higher when I use my 125 mcg brand name patches from Janssen than when I use my 125 mcg generic patches from Sandoz, Mylan, and other generic manufacturers, whose names I do not remember.
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