Flexeril: (cyclobenzaprine) can sometime cause a "false positive result" ; however,these tests are quite specific. I suggest calling your lab and physician
Answered 2/8/2017
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Uncertain: This article may be helpful. See: https://academic.oup.com/jat/article/38/7/387/2798054. I don't know why you tested positive - Efavirenz (EFV) & sertraline have tested positive on some tests. Although Ibuprofen has also caused false positives - I wasn't able to find literature for flexeril. (Cyclobenzaprine). Chlopromazine, Efavirenz, Fenoprofen, Flurbiprofen, Indomethacine, Ketoprofen,
Answered 8/11/2020
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