Positive For Phenobarbital

I have taken Cephalexin, night time Cold & Flu (Rexall), Tylenol extra strength, Delsym, Allergy/Sinus Headache, Tramadol, Penicillin V and Oxycodone and I tested for Phenobarbital 5 times.

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I was wondering if any of the above combinations of medications could produce a false positive.

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