False Positive Urine Drug Test For Phenobarbital

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Candace Says:
I have had 2 urine drug screens w a 2 1/2 wk difference between. The first GC/MS + phenobarbital >1000ng & the 2nd + 816ng. I've never taken this drug before. The meds I do take are: gabapentin, tramadol, ibuprofen, sumatriptan, omeprazole. Please help!

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Verwon Says:
Nothing you've listed is known to cause false positives for any type of Barbiturates, including Phenobarbital.


Has your doctor had any ideas as to what may be causing it? Did you take anything else, even over the counter products?

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Karen Says:
Not true. Google NSAIDs (ibuprofen) and phenobarbital. Several stories from legitimate sources about them causing a false positive for barbiturates. I know because I am arguing with my doctor over this very thing right now. I take Adderall and am required to get drug tested. She said another positive test result for barbiturates (which I DO not take) means she can't refill my rx. Not sure what I'm going to do. The lab declined to look into it, as I've heard is the case in these situations. I ordered a home test to see if I could duplicate the results. Ask your md for a gc/ms test to confirm the results. I demanded that for the next test in a few weeks.

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Doctor John Says:
Those medications will not cause you to test positive for Phenobarbital.

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Nerdboy Says:
I am in Drug Court. I tested positive for phenobarbital and now have an open violation of probation pending in Court. I take only two medications, naproxen and cyclobenzadrine as prescribed. I am concerned as to the magnification studies conducted on the two medications for which I am taking. DO they have trace evidence of a barbiturate base?

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Doctor John Says:
If the drug test wasn't really confirmed, I would make the laboratory send it out for LC/MS/MS confirmation. If the Phenobarbital still shows, IT IS phenobarbital.
Usually the only cross reactions are from EIA or FPIA and of course the home test kits which use an antibody marked gold substance. Cross reactions do not happen with LC/MS/MS.

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Mighty Says:
via mobile
I take phenobarbitol at 320mg nightly. As for now I must do weekly court ordered urine tests. I already take marijuana nightly with my meds when I go to bed. As for now I must stop the use of marijuana. My question is, will phenobarbitol show positive for marijuana even if I have stopped?

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Kat Says:
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So does phenobarbital show up on a drug test?

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