Drug and Alcohol Testing Q&A - 2008

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Re: Can naproxen cause a false positive THC test?

From: Robert Swotinsky MD
Password: orange
Date: 31 Mar 2008
Time: 07:56:24 -0800
Remote Name: 4.154.248.199

Comments

No. Many years ago, the Syva company produced a marijuana immunoassay product that had some cross reactivity to ibuprofen. That product is long gone. And, there never has been concern about ibuprofen or related compounds, such as naproxen, causing GC/MS-confirmed positive results for marijuana metabolite.