Questions about False Positives in Drug Testing, page 284

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 this forum is not for medical or legal advice.

False positive for K2?
Date: 4/10/2006
I need to know if Lamictal can cause a false positive for K2 on a “dip stick” Urine Analysis. I never started testing positive until I started it.


AskDocWeb: Sorry Zachary, we have no data on any false positives for K2. If anyone can provide a reputable source for information please do so.

Smashed up Claritin D?
Date: 4/10/2006
I recently was falsely accused of possesion of methanphetamine. I have a claritin d perscription. I am wondering if smashed up claritin d will show positive in a crime lab for crystal meth in powdered form when tested.


AskDocWeb: No, they will be able to tell the difference.

Tested positive for hydrocodone?
Date: 4/11/2006
I have been taking Seroquel for a few months now and they gave me a drug test at the doctors office and tested positive for hydrocodone this is absolutely no way in the world that that could have come up. I do not take hydrocodone and that really bothers me. I was so upset because I was so looking forward to coming out clean please tell me how this could have happened. Email is (address deleted).


AskDocWeb: Seroquel (quetiapine) has been noted to test false ositive for amphetamines (Reference 48) but not for hydrocodone, which is in a different class of drugs. If your test result was a false positive getting a confirmation test (GC/MS) would show that you haven’t used hydrocodone.

False positive THC questions
Date: 4/11/2006
I have a few questions. My partner and I recently tested positive for thc but we are no longer users. Haven’t used in at least 2-3 years. We also haven’t lost any weight everyone has told us thc stores in your fat cells which if you don’t lose weight it stays, well recently We have currently started using Renew Life Jumpstart weight loss 3 day diet start. It has a system cleanse and an energy booster, could that cause a false positive? My partner also has chron’s diaease and is on remicade iv infusion treatments could that cause a false positive? Last question do Nsaid like over the couter naproxen sodium cause false positive thc?


AskDocWeb: Neither your remicade nor the Jumpstart has been reported to cause false positives on urine drug tests. However, Naproxen (Aleve) may test false positive for THC (Marijuana) (References: 3, 16, and 18).

Positive for benzo’s
Date: 4/12/2006
i took a drug test today and am showing up positive for benzo’s. I have only taken toradal 1m and ultram. I am also taking suboxine. will mixing any of these prescriptions cause me to show up positive on a drug test for benzo’s.


AskDocWeb: Those drugs, by themselves and in combination are not known to test positive for Benzodiazepine.

False positive for THC
Date: 4/13/2006
i have been in a methadone clinic for quite some time. i have been dealing with ovarian cancer and have been using thc. i decided that i needed to quit and quit feb 20th. i had a urine screen march 23rd which came back clean for thc, the levels were zero. then on april 10th was tested again and it came back positive for thc at 105 ng and that is a chronic level and i have NOT smoke or used thc at all. i take ibuprofin like crazy for the pain and cysts and my father suggested to start a niacin and vitamin c regiment, which was the only difference between the march ua and the aprils. im very disturbed and thinking of going to get blood drawn to prove them inaccurate. i paid 25$ to have the same urine retested because i know i havent used. please help.


AskDocWeb: We have heard from Emergency Room nurses that say it is common for Ibuprofen to test false positive for Marijuana (THC). There are also several references that back that up; 1, 3, 16, 18, 29, and 48. However, when retesting uses the same method as the original test that is a waste of time and money. Any additional testing should use a more accurate form, which is usually a GC/MS test.

Date: 4/15/2006
i have read somewhere that gabapentin can cause a false positive drug screen for cocaine, is this true?


AskDocWeb: No. Gabapentin will not show up on drug tests for drugs of abuse. The only false positive association we found with Gabapentin has to do with the results of the Ames N-Multistix SG® dipstick test. That’s a test for protein in the urine, which indicates the beginning stages of kidney and cardiovascular diseases.

What could cause this?
Date: 4/17/2006
I recently went to the Dr for a checkup, being it was my first time they did a drug test on me. It came back positive for hydrocodine, the only thing I take is Advil for my migraines an heartburn relief for my heartburn. Ive never did drugs or even took pills like talking about it. This hurts me cause now my family thinks im on drugs an am in denial. What could cause this? Please help me understand why this is in my system an I dont know how it got there.


AskDocWeb: If your test result is a false positive then hydrocodine (hydrocodone) may not be in your system. Urine tests are not 100% accurate so a positive result needs to be confirmed by a more accurate test. That is usually a GC/MS confirmation test. Assuming that the confirmation test comes back negative then showing your family the results of the confirmation test should reassure them as well as your doctor.

Date: 4/17/2006
Asifex will it show a false positive for THC 40mg a day


AskDocWeb: We have no listing for Asifex. Did you mean Aciphex? If so, Aciphex (rabeprazole sodium) and other PPIs may test positive for THC (Reference: 37).

Date: 4/18/2006
Ok i got a drug test at work and failed it for thc. I dont do any drugs i dont even smoke cigerits. I am on ibuprofen 800 mg, could that cause it?


AskDocWeb: Yes, according to reports from emergency rooms, Ibuprofen is a common cause of false positives for THC on urine drug tests for drugs of abuse.

Date: 4/18/2006
I recently had to take a drug urine screen and my test showed pos for meth. I dont used the drug and never have. I do infact take the drug Zantac. So FYI… Zantac does infact cause a urine drug screen to show a false/pos.


AskDocWeb: Thanks Jennifer. That was also confirmed by an ISO-certified drug testing and toxicology laboratory: IT Laboratories.

Metronidazole vaginal gel
Date: 4/19/2006
Hello! I have been taking metronidazole vaginal gel for an infection. I had to take a pre screening drug test. I didnt get the job and wantes to know if this could cause a positive drug test. Thanks


AskDocWeb: Metronidazole vaginal gel is not known to cause false positives on urine drug tests for drugs of abuse. However, there are hundreds of other possible causes.

Date: 4/19/2006
Would like to know if lithium would have a false reading on drug test for any drugs.


AskDocWeb: No. Not for drugs that are commonly known to be abused.

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