Questions about False Positives in Drug Testing, page 197

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.

Lab results
Date: 4/26/2012
I keep testing positive for methadone. I am on a high does of gabapentin for my diabetic neropyathy is it possible that my high does of gabapentin be firing the receptors for methadone be cause the test from the lab keep coming back negative.. please help..


AskDocWeb: Hi Brad, welcome to the forum. Let’s be clear about your test results. If lab results come back negative, that means that drugs of abuse were not detected. If the lab results come back positive then they found something in your sample.

The list of substances that have been documented to sometimes show as false positives on urine tests for methadone is pretty short: Antihistamines in general, Bentyl®, Elavil, Methadose, Nyquil, Phenergan®, Physetone, and Vicks Formula 44M. Some people with diabetes have tested false positive for meth but not methadone. There is a big difference between the two. Meth is short for methamphetamine, which is a psychoactive stimulant. Methadone is a synthetic opioid used to prevent withdrawal symptoms in patients who were addicted to opiate drugs. Methadone is also used as an analgesic and an antitussive.

Positve screening for extacy
Date: 4/27/2012
I get random drug screens an i was just recently put on welbutrin 150 xl I am prescribed to take 2 tablets a day i got a positve screening for extacy I dont use know type of drugs what so ever. I had a pharmacy tell me that it could cazuse aa false positve for extacy.


Child custody situation
Date: 4/27/2012
My husband and I have lost temp. Custody of our two children. We have random drug test each month and my husband has tested positive for amphetamine 4 times and I have once. We do not use drugs but after research I have found that OTC medication can test positive for amphetamines. He takes zantax like its candy, and the time I tested positive I had been super bad sick. Was taking alkaline selzer sudafed, and other medication to get better. I am determined to prove our case and when we are tested not once have they asked if we have taken any medication. I read that they are suppose to ask, or we should let them know. We told them about the Santa’s but were told the levels were to high to cause a positive result.

This is a custody situation where we are not looking. So good. We have no attorney, never have. We pretty much are at the mercy of the court. Can you please help me understand this. Advise me. No drugs have been taken. Thank you.


AskDocWeb: It sounds like you need to protect yourself from CPS abuse. Please read “What to do if CPS workers are investigating you.” There is some good advice there.

Date: 4/27/2012
Would taking pantoprazole cause a false positive for marijuna. My son had surgery and was given this and then later had to be tested for marijuna and failed. Could this have caused it?


AskDocWeb: That is a possibility. There are two sources that say Pantoprazole (Protonix) might test false positive for marijuana (References 37 and 57). IT Laboratories (reference 57) is an ISO-certified drug testing laboratory making them experts in this field.

Acyclovir or Keflex?
Date: 4/28/2012
Can acyclovir or keflex make you fail a drug test, and if so, what for?


AskDocWeb: There are no reports of false positives with either drug.

What products can cause a false positive for meth?
Date: 4/28/2012
Hello i am looking for what products can cause a false positive for methanphetamines


AskDocWeb: There are about 50 possibilities and are listed on the big list.

Super clean?
Date: 4/29/2012
Ok so I havent smoked weed since march second well as of march 8th i started doing drug tests for probation well my first drug week one test came back as thc level of 89 my second week two came back with thc level 179 my third week three came back all negative then my fourth week four came back thc level 44 then week five was all negative tell me how this could happen plz anyone because where it went from levels bein from down to up then to neg then showed back up again i got locked up n spent five days in jail and now im n even more trouble and i have not smoked or done any meds or anything at all i have been super super clean someone plz email me i was honestly falsly arrested n i need to prove my case but dnt know how to cause i have been clean someone hlp me out im not understandin how my tests kept doin that.. oh fyi before march 2nd i smoked prob on a dailey basis bout three times day and im female 5’3 200 lbs….


AskDocWeb: Remember that this forum is intended for those who do not abuse drugs. If you are honestly clean then getting a GC/MS confirmation test will show that. If you are being dishonest it will also show that.

Date: 4/29/2012
Hey I have been going to a methadone clinic for 4 years I have had 47 clean drug screens. Well last month I found out I have diabeteas and was put on METFORMIN well my last test showed up positive for a benzo if i dont fix this i loose two weeks worth of take home meds, which means i have to go 20 miles one way to the clinic everyday. so my question is could metformin cause the false positive?


AskDocWeb: Metformin has not been reported to cause a false positive on urine drug screens.

If you are innocent, fight it!
Date: 4/29/2012
I have been taking tylnol 3 as prescibed for irriatable bowel i was givin a ua and got a false positive for oxycodone i was told i was an abuser and when i said i dont use that i got its ok most addicts dont admit, STEP UP TO THE PLATE ON FALSE POSITIVES IF U KNOW YOUR NOT AND ARE BEING TREATED LIKE A WORM, FIGHT, CALL A LAWYER FOR WHAT U STAND FOR. THANKS


Failed alcohol test
Date: 4/30/2012
I just started using ProAir HFA inhaler for asthma, I failed an alcohol deep lung test, why did that happen? then 30minutes later I passed with no trace of alcohol.


AskDocWeb: That may be because ProAir uses ETHANOL as an excipient – a Class 3 residual solvent according to the FDA. When ethanol is used in inhalers in large enough concentrations it may cause a positive alcohol test for several minutes. Some amounts remain in the mouth after using and as a result can distort a breathalyzer result. You may want to consider changing to an inhaler that does not contain alcohol such as the Ventolin HFA inhaler.

Date: 4/30/2012
I had a drug test that came up positive for cocaine while I was being prescribed amoxicillin. If I pay to send it to a lab will they be able to tell the difference and vouch for the false positive?


AskDocWeb: If the false positive was caused by the presence of amoxicillin and the lab does a confirmation test, then yes, they will be able to tell the difference and vouch for it.

Positive for oxazepam
Date: 4/30/2012
I am on celexa, clonazepam, iron sulfates for anemia, valerian root, and prenatal vitamins. I recently showed up positive for oxazepam and I don’t know what this drug is. Please explain to me what this drug is or why it would show up on my urine analysis.


AskDocWeb: Oxazepam is a prescription drug used to relieve symptoms of anxiety, including anxiety caused by depression, and the symptoms of alcohol withdrawal. It belongs to the class of medications called benzodiazepines, which are among the most commonly abused drugs. The Clonazepam you are taking is also s benzodiazepine. A common urine test for drugs of abuse may not be able to tell the difference.

The valerian root may also be a complicating factor. According to the Oregon State University College of Pharmacy Valerian root and extract may test false positives for benzodiazepines on urine drug tests (Reference 36).

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