Feedback on False Positives from Drug Testing, page 46

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: Pantoprazole protonix
Date: 9/27/2008
Two years ago I tested positive for marijuana use after a urine drug test. I could not understand, because I am not a drug user. After checking my medications, I was told and given information that “protonix”, which was prescribed due to Barretts Syndrome was the culprit and caused a false positive. I am still taking the medication and would like to know if this medication still causes the reaction. I am taking the generic “Pantoprazole” 40MG tabs. I will be given another test soon and would like any information you could provide to me. Thank you for your help.


AskDocWeb: According to RxList, “There have been reports of false-positive urine screening tests for tetrahydrocannabinol (THC) in patients receiving most proton pump inhibitors, including pantoprazole.” (See reference 37)

Subj: False positives about Methadone
Date: 9/29/2008
It looks like you do not believe the false positives about Mthadone, but I tested positive for it today. I have taken Xanax, Donnatal, Phentermine, Benadryl, and a Z-Pac in the last month…but I tested positive for Methadone. I have never even seen this drug.


AskDocWeb: It not that we don’t believe you, it’s that we have not yet located a good reference on this. If you find one be sure to share it.

Subj: False positive cocaine?
Date: 9/29/2008
Can a combination of muscle relaxers, pain killers, lidoderm pain patches and cold and flu medicine, alergy shots and allergy pills, all prescribed, cause a false positive cocaine test? I DON’T USE IT. At the time of the test I was trying to recover from MONO as well. I was extremely tired and run down as well. I was sleeping 22 out 24 hours for 5 days.


AskDocWeb: Yes, you can check your individual meds on this page.

Subj: Non dot urine test
Date: 9/30/2008
I took a non dot urine test on Tuesday 9/23/08 and it is now Monday 9/29/08 and i havent received a call. Is this a good thing? They only contact you if you fail the test if I’m not mistaken. A little concerned. Any imput would help. Thanks,


AskDocWeb: Typically they only call you if the results are bad news so you can relax.

Subj: Testing positive for benzos
Date: 9/30/2008
My friend & I both go to Methadone clinic. In May 2008. We were given a list of drugs to take in the place of our benzos. Anybody testing positive for benzos can loose the priveleges for staying clean and possible even be kicked out. We both were put on zoloft(sertraline & traxadone). We keep testing positive for benzos. We asked for comfirmations, which came back with a drug called oxazepam(which is a benzo). We have offered to take any kind of test to prove we are clean. What we get is “we have to go by the results”. I have been to my dr and pharmacists. It seems no one really wants to get involved. Can you help or recommend someone who can. Thanks,


AskDocWeb: You might discuss this with the doctor that prescribed the Zoloft and find out if there is an alternative you can take.

Subj: Positive for cocaine
Date: 9/30/2008
Someone I know was taking Guaifenex, Naproxyn, and Ibuprofen and showed positive for cocaine. Could this have caused a false positive.


AskDocWeb: Of those three only Naproxyn (See reference 26) has shown up as a false positive on a drug screening.

Subj: Panic attack since I was so confident
Date: 9/30/2008
I am going through a trial for possession of Marijuana. It has been at the bare minimum of two months, but more likely 2.5 or 3 months since I have been around or smoked any marijuana. Before my trial, I went to Walgreens and purchased an over-the-counter THC drug test (FDA approved and recommended by the Pharmacist) and both came out negative, and were taken respectively 5 weeks and 7 weeks at minimum after last being subject to marijuana. I was very confident due to this going in to my UA yesterday. When I went in and took the test, it came out Positive for THC, resulting in me having a severe panic attack since I was so confident. They are sending it in to the lab to be tested since I am on so many medicatons (Prazosin, Lorazepam, Hydroxyzine, Hydrochlorothiazide, Lamictal, Clonazepam, Fluoxetine, Prevacid, and other over the counter drugs for headaches and migranes). From your experience, can any of these drugs cause a false positive on a THC test? Also, I heard from the Pharmacist that THC binds to fat cells, and is released in times of stress. I was told since I am a very obese woman, that it may take multiple months for the THC to leave my body. Is this correct information as well? What do you think happened here?


AskDocWeb: Three of your meds may cause a problem; Clonazepam contains benzodiazepines, Fluoxetine may show up as amphetamines (Reference 31), and Lorazepam contains benzodiazepines (Reference 18). The more marijuana smoked and the heavier the body, the longer THC stays in the system. Typically it stays for about (CENCORED) days. We’re still checking the possibility that the THC in fat cells might cause a problem later.

Subj: Protonix
Date: 9/30/2008
How about Protonix, will I test positive for a urinalisis for a new job?


AskDocWeb: Protonix has been reported to show up as a false positive for THC or Marijuana (Ref: 37).

Subj: No false-positive
Date: 10/1/2008
Just wanted to share info: 45 days since last hit off of a dug-out one hitter, so I knew I was pretty much okay for thc test. But, I was worried because I was on cefzil, zyrtec, and prednisone for really bad sinus infection. I had to take a post accident drug test as standard for work. I was a labratory manager for awhile so I know that some metablites for some script drugs show false-positive. Needless to say, results came back in 5 business days and none of medicines above showed up as false-positive.


Subj: Tested positive for marijuana
Date: 10/2/2008
I recently was told I tested positive for marijuana, I am not sure what type test was used but it was a urine test. Approx 12 days prior to being tested I was taking Naproxen 550mg twice daily and had taken a dose three hours prior to being tested. Would this show a false positive reguardless of the testing method used?


AskDocWeb: No, the false positives we discuss here are for urine tests only. And in urine testing they occur only in a small percentage of tests.

Subj: False positive for cocaine?
Date: 10/2/2008
Can Loratadine, Aspirin, Hydrocholorothiazide, Plavix, Lisinopril, Vytorin, Albuterol cause a false positive for cocaine or any other illegal drug?


AskDocWeb: If the Aspirin has codeine in it, that may show up as a positive.

Subj: Albuterol Inhaler?
Date: 10/3/2008
Can Albuterol Inhaler cause a false positive for benzodiazepines?


AskDocWeb: It has not been documented to do that but several people have reported getting a positive drug result after using the Albuterol Inhaler.

Subj: Tested positive for cocaine
Date: 10/4/2008
I have a q. My boyfreind has been on probation for a while now. And as part of that he is required to do a urine test once a month. He has had spotless testing for over a year now. He is on a myrid of medication for a number of things. He went a did his testing today 10-3-08 and he tested pos. for cocaine. There is no way and I’d stake my life on it that he is clean. But he did start taking a new med. the same week he was to test. It is Clonazepam 1 mg. 2x a day. Never had a problem before, can this med make him test a false positive? Or can it be in combo with his other meds? If need be I can list as well,( but there is alot of them) and everyone is a prescription.


AskDocWeb: Everything we have been able to document that causes a false positive is listed on this page.

Subj: Zantac
Date: 10/6/2008
My boyfreind just failed a drug test for meth and has never use it or did it the only thing has has taken was a zantac 150 mg can that make you fail a drug test?


AskDocWeb: Yes, Zantac is on the list.

Subj: Prozac?
Date: 10/7/2008
Can prozac cause a false positive for benzodiazapines, in a blood test? I tested positive for benzodiazapines and I did not take anything but prozac.


AskDocWeb: Sorry Ryan, no false positives have been reported for Prozac.

Subj: Zofran and tylenol
Date: 10/7/2008
I am pregnant and have been taking generic zofran for nausea. I took a drug test for court and it came back positive for opiates I not been using any drugs other than my zofran and tylenol. Can either of these cause the false positive?


AskDocWeb: There are no reports of Zofran causing any false positives but Tylenol is mentioned several times. Check this list to see if the Tylenol product you are using is on it.

Subj: This list helped
Date: 10/7/2008
I had a false positive for PCP and they took my kids from me for that. This list help me prove I’m not a drug addict.


AskDocWeb: Thanks for letting us know Amy, glad we could be of service.

Subj: False positive for cocaine?
Date: 10/7/2008
Can taking ultram/tramadol, percocet, amrix cause a false positive for cocaine?


AskDocWeb: Percocet will test positive (not false) for opiates.

Subj: Wellbutrin
Date: 10/8/2008
My daughter has tested boderline for meth on a urine drug test for the last 4 weeks. She started takeing Wellbutrin 4 weeks ago. From what I have read that can cause a false positive for meth. True or False and if true can you give me something to substanciate this. Thanks


AskDocWeb: Wellbutrin has been reported to show up as a false positive for Amphetamines (See reference 12) on urine tests but not meth.

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