Keflex False Positive Drug Test

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Will taking cephalexin 500 4 times a day for 7 days show up as a positive in a drug test? Will be taking drug test 3 weeks after finishing meds

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Will the antibiotic reflex show a "false positive" drug screen?

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I recently took a drug test that was a dip stick put in my pee and I was taking keflex, ibuprofen, lamotragen, clonodine, resperidone and the test came back that I had benzodiazepines in it and none of my meds are benzodiazepines the only thing that would give a false reading would be the keflex I was pissed. So they didn't believe me until a couple days later when they sent it off to the lab when it came back negative for benzodiazepines and still they don't think that it was the keflex that caused it. Unbelievable!

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