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Can Ibuprophen and Naproxen Sodium cause a false positve for THC?
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brad2011 posted:
I tested positive for THC this week even though I haven't smoked marijuana in over two years. I did take 1 Aleve and 2 Ibuprofens the night before the test and then 3 ibuprofens that morning because of a sore knee. After testing positive around 11am, I knew it had to be wrong so I bought a home drug test kit and tested clean at around 7pm the same day. I even went to a "doc in a box" type walk-in urgent care facility the next day to have a more accurate urine screen performed and I got the results back today and they were negative, too. So again, my question is, could either the Ibuprofen or the Aleve, or even a combination of both have produced a false positive for THC? Please help me so that I can avoid this in the future...

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Betty Ford Center
James Golden, MD responded:
Both Aleve and Ibuprofen can result in a false positive test for THC. With newer testing methods, we can run confirmatory cross-checks to check for interfering substances, such as metabolites in these medications.
 
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stick312 replied to James Golden, MD's response:
I recently took five urine tests on successive days. I began taking Aleve for tendonitis in my elbow during that time not knowing it might impact the test results. Turns out the last three all tested positive for THC. I contacted Bayer directly and they had no information on file that Aleve would cause a false positive for THC. Where can I get reliable substantiation this could happen?
 
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Betty Ford Center
James Golden, MD replied to stick312's response:
This guide from the Mayo Foundation for medical Education and Research offers extensive information that may be helpful:
http://www.mayoclinicproceedings.org/article/S0025-6196(11)61120-8/abstract
 
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Grundo replied to James Golden, MD's response:
I recently test positive for thc. I don't smoke but I did take naproxen for my back that morning. When the doctor called me to tell me I failed I asked what my level was and he said 47ng. If its under 50 isn't that a negative? Will naproxen give you a false negative? Is there such a thing as a false negative? The doctor from the lab says no way naproxen will give you a false negative. What should I do?
 
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An_254060 replied to James Golden, MD's response:
I just did & that is the only thing I take. May I ask a question? Aside from living with (part time, someone who is a smoker) I am 40 yrs old and have a zero tolerance for that crap. I never really did. Maybe before I was 20. Never, I do not care how many people want to judge or say this or that....my feet swell 3 times larger than my shoe size and my legs die all day and are very painful from a condition i have, however, the result was a 9. Thats not even failing level. Its not even usage level. Apparently I spoke to the lab there and they told me this, specifically asked me about naproxen and yes it sits on my counter every day as I need it often to wear shoes. What does anyone have to say about this? They are recalling it based on I passed the very next and oddly I had a drug test a day before and nothing came up, so what is the deal here? I can honestly say I am not a smoker, I never liked it and I never will. This is an urgent matter and no, Im not on probation, but for other reasons it is urgent. Can someone help answer this question? My mind was blown when they called to say sorry after and are rescheduling things, however, I need to know WHY? Is it really true this would have an effect and if so how? Such a low one at that. Not even failing level. If I had made failing level they would have went about things differently but I did not even make that so my lawyer postponed (custody arrangement Issue) ...... however my son is begging to come home, begging, He is 12. Please. Tell me what I did or can do or why even? It is not going to rely on this however I cant understand it. Just looks silly to the judge, but it was not failing either so he was understanding and just needs to know. I have a few thoughts but to be honest, Idk if they would even be an answer. First of all I had a huge party at a friends the night of my 40th birthday. I do not drink, so its not like anything went into my body that night. My lawyer said poss 2nd hand but I say no to that. It bothered me he even said that!!! Do not make excuses for me...! I know myself and If I say, I did NOT do it, Im saying I did not do it.Some people will give you a load of bc for an answer, however, my son is my only son and I could care less about a glass of wine, any drugs, or even lobster or new clothes. HE, comes first, period. I would never and have never jeopardized that. Now, my ex is laughing and screaming profanity as I left the court house. If I left my car open ever, and left my coffee in there daily as I do, could anything at all, anything had ever be put in it? I would not be surprised as he disassembled my last car just months ago. One thing, if you are on someone's car everyday (bc temp yours is not running at all), and they drive with someone who DOES smoke and does so in the car, could that in ANY way at all do this? I need to now because if so, I can never and will never get in that car again. I'm renting a car tomorrow by the way just in case b/c that is my only thought aside from the as needed Naproxen Sod..anti inflammatory... ....Please, may an expert Please, help answer this question. GBY for answering or helping in Any way.
 
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ljude38 replied to James Golden, MD's response:
I had no idea about this. Thank you for the info.
 
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tucker22 responded:
Yes, I just tested positive for THC. I could not understand why. I have passed drug test before without problems urine and swab tests. But I am just now finding out about these false positives with Aleve. I did take Aleve and was taking prescription for Alprazolam. I told them about the prescription but forgot I also took Aleve. I am going to let them know and hope they will re-test me. Because I stopped taking both.


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