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False Positives Forum

This forum is intended to help those who Do NOT Abuse Drugs. We do NOT support the illegal use of any substance. If you have experience with false positives, share your experience. What would you tell someone about drug testing and false positives? Please remember that we do not give medical or legal advice.

Subj: Wellbutrin
Date: 6/28/2010
can wellbutrin cause a false positive for suboxone?

AskDocWeb: Wellbutrin has shown up as a false positive for amphetamines (Reference 12) but not suboxone.

Subj: It isn't fair
Date: 6/29/2010
I am on methadone and have been for 4 years. I have 3 and a half years clean from all illicit substances. I go to college and have a 3 year old daughter. I get 13 take home bottles of my medication so that I can attend school. Today my counselor called me to say I tested positive for buprenorphine. She said the cut off was 20 and I was 15, but the lab said that meant I took it a few days ago and it is flushing out of my system. I have never used any buprenorphine and barely know what it is. Everything I have worked so hard for is about to be stripped from me and it isn't fair. All I take is; Proventil, albuterol inhaler which I took one hour before the urine test, 800 mg. Ibuprophen, and use over the counter Bikini Zone gel which is Lidocaine. Please help me prove them wrong.

AskDocWeb: The only way we know of to prove that a urine drug screen is a false positive is to get a GC/MS confirmation test.

Subj: Darvocet
Date: 7/1/2010
I was given a couple Darvocet in the emergency room 24 days ago. Will they show up on a GC urine test now? Very important, please answer as soon as possible.

AskDocWeb: Darvocet has not been reported to show up as a false positive on urine drug tests.

Subj: Levaquin?
Date: 7/3/2010
can you test positive for any street drug taking levaquin?

AskDocWeb: According to the Food and Drug Administration Levaquin has shown up as a false positive for opiates (Ref: 35).

Subj: Enzyte?
Date: 7/3/2010
Can enzyte give fa faulse pos for any drugs I'm on probation with the department of corrections and I'm subject to drug screening. At any time I'm worried because if I fail I could be sent back to prison. I do know that it contains large amounts of niacin witch help clean your system.

AskDocWeb: We can't say for certain but there are no reports of that happening.

Subj: Tramadol or naproxen?
Date: 7/5/2010
can tramadol and naproxen causea false positive for amphetamines or meth?

AskDocWeb: While Naproxen has been reported to show up as THC (References 1, 3, 16, and 21), neither tramadol nor naproxen has been reported to show up as amphetamines or meth.

Subj: Tested positive for benzo's
Date: 7/5/2010
trazadone and drug tests..... just an FYI. I have tested positive for benzo's that I know I have not taken. The only meds I was taking was trazadone and seroquel. After coming out positive I investigated and found out that seroquel although shares some of the same chemicals as benzo's does not get a false positive reading, but after stopping the trazadone I no longer read positive for benzo's. I'm no doctor but I tested positive for benzo's while on trazadone and now while not taking trazadone I no longer test positive. you figure it out. idk.? All I do know is that its very frustrating to know you are not doing something but get accused for it anyways.

Subj: Tested positive for meth
Date: 7/5/2010
Just tested positive for METH!! Never have done it.. I have been taking diet pills such as mini thins.

Subj: Tested positive for benzo's
Date: 7/5/2010
I am a methadone patient at a clinic, I have been following the program to a tee. I was tested positive for benzo's which are very dangerous to mix w/methadone. and which I could be thrown out of the clinic for. I have not used anything except the meds they know I take and that are being ordered by thier own doc. I take trazadone that I just found out can show a false positive for benzo's? is this true? and if it is shouldn't their doc's be aware of that? And I can't believe I am the 1st one this has happened to.

AskDocWeb: There are antidotal reports that say Trazodone may show up as a false positive for benzodiazepine on urine drug screens but so far we have been unable to locate a good reference for this. The closest we could come to a good reference is the Collegiate Sports Medicine Foundation. They have a document file that says trazadone has been associated with false positive results. The file is at

Subj: Vodka tonic
Date: 7/6/2010
I had a job interview and they asked me to do a drug test the following day. Considering that I am clean and don't do anything other than drink every now and then I wasn't worried. However, I had a vodka tonic the night before the test. I read that quinine can cause a false/positive result... Should I be concerned?

AskDocWeb: There is a small but real chance that it could show up as an opiate in a urine drug test. There are also a few health concerns with using quinine.

Subj: False positive?
Date: 7/7/2010
I hurt my back at work and had to take a drug test and it the lab tech said that the bottle I had used was not working properly so the house supervisor told her to get another one so she went in the back and poored into a new one and then goes on to tell me that it had just tested positive for cocaine! I am and always have been clean as a whistle. I did take naproxen for a headache about 7hrs before that and the night before my husbands lidocaine patches 2of them ended up on me i noticed them in the morning. Can any of these cause a false positive?

AskDocWeb: You may be dealing with an invalid sample if the tech broke protocol by removing the sample to the back room before sealing the specimen bottle. Proper chain of custody procedures must be executed by collectors when handling specimens to ensure that a specimen has not been adulterated, contaminated, or substituted during the collection procedure.

Subj: Novocaine or lidocaine
Date: 7/9/2010
Can novacaine or lidocaine cause a positive cocaine test? Can it be differentiated in any type of drug testing? If so which one?

AskDocWeb: According to Blue Grass Drug Screen, Inc. Novocain may show up as a positive for opiates on urine drug tests.

Subj: Passion flower or Skullcap?
Date: 7/9/2010
I take alot of herbal supplements for high blood pressure. Would passion flower (PASSIFLORA INCARNATA) or Skullcap (SCUTELLARIA LATERIFLORA) cause false positives. I don't want to continue these if there is any chance they would show us as a false positive.

AskDocWeb: You are okay, neither of these have been reported to cause any problems on drug tests.

Subj: Prilosec?
Date: 7/9/2010
i keep failing drug test for meth.... can any prescription heartburn pills do that im on prilosec?

AskDocWeb: No, Prilosec has not been reported to cause any problems on drug tests.

Subj: Diphenhydramine
Date: 7/10/2010
I was really wanting a accurate answer about Diphenhydramine. I have to take a drug test for the military in 3 days and need to know if it will be ok to take a 25mg sleeping pill. Many thanks,

AskDocWeb: According to an article at MedScape, Diphenhydramine has shown up as a false positive PCP (Reference 24). However, that is not to imply that you shouldn't take it. Just make sure to get it listed on the form when you take the test. And thank you for your service to our country.

Date: 7/10/2010
I was prescribed BENZONATATE ORAL and I was wondering if it would show up in a drug screen that I'll be having for my second job I will start next week.

AskDocWeb: There are no reports of Benzonatate oral causing any problems with urine drug tests.

Subj: Positive for THC
Date: 7/11/2010
I took prevacid 24 hour a day before i had a drug screen. when the results came in the next day they told me i was positive for thc.. I have also been smoking a legal herb called Damiana.. Do you think the damiana gave a positive for thc, or is it more likely to be the prevacid 24 hour?

AskDocWeb: There is no THC in Damiana. Prevacid is not on the list but another PPI, Protonix, has been reported to show up as a false positive for THC on urine drug screens. Protonix Patient Information now admits that it "MAY AFFECT THE RESULT OF CERTAIN LAB TESTS (eg, false positive urine screen for tetrahydrocannabinol-THC.

Subj: Prenatal multivitamins?
Date: 7/12/2010
I have a CYFD case and I just would like to know can prenatal multivitamins give false positive results on drug screenings/ Uas?

AskDocWeb: No, the only vitamin reported to cause false positives is large doses of B2. None of the prenatal multivitamins have caused any problems on drug tests.

Subj: Wellbutrin
Date: 7/12/2010
My bf got arrested and is put in jail because they said his urine test came back neg. he is on parole. It came back as meth and he was on wellbutrin at the time as well, is this on the list and how can I prove it?

Wellbutrin is on the list because of false positive for amphetamines (Reference 12) but not meth. The only way to clear up a false positive is to get additional testing at an independent lab, a GC/MS confirmation test.

Subj: Tested positive for Methadone
Date: 7/12/2010
I recently tested positive for Methadone. Haven't taken Methadone, I'm baffled. I have RX for Duragesic, pecocet, requipt, xanax, nuerontin, soma and Restoril. The week I took my UA I was givin a script for Phenagren and given a shot of Dexatron. With the amount of drugs I'm already taking Methadone could kill me. I knew when my UA was gonna take place. I'm just totally stumped!!!

AskDocWeb: Our best guess is that it is likely to be the Percocet. That will test positive (not false) for opiates (References 3 and 20).

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