Feedback on False Positives from Drug Testing, page 84

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: Nausea medicine?
Date: 3/7/2010
I took two (2) phenergens and a few days later I had to take a drug test. It came back positive for marijuana. I have never smoked drugs in my life. This could be very bad for me. I was wondering if taking that nausea medicine could cause that.


AskDocWeb: Phenergan (Promethazine) has 3 references that say it may test false positive for THC (3, 16, and 18).

Subj: Ranitidine
Date: 3/8/2010
Ranitidine, will this cause a false positive on a drug test?

AskDocWeb: Not in every case but Ranitidine has been documented to sometimes show up as a false positive for amphetamines in urine drug screens. (Source: New York State Office of Alcoholism and Substance Abuse Services:

Subj: Positive for Benzodiazepine?
Date: 3/9/2010
i would like to know if somebody could answer a question for me. I had took a drug test on Friday for a treatment center (court ordered) they said i had tested positeve for Benzodiazepine. That is not possible I have not taken any illegal drugs.

AskDocWeb: If you haven’t taken any illegal drugs then your drug test may have produced a false positive. That is why we put together this list. Look it over for something you may have taken to explain your drug test results.

Subj: Tested positive for heroin
Date: 3/9/2010
I was recently assaulted at work and sent to the emergency room. There i was given Fentanyl, vicidens, and I was on Methadone. When i was given a drug screen for work, the doctor told me my urine sample tested positive for heroin and they were 100% sure that it could not have been caused by the following drugs given to me at the Emergency room. Could poppy seed bagels have messed with my results or can these drugs show up as heroin in a urine screening. Thank you for your help and consideration in this very serious matter.

AskDocWeb: Poppy Seeds contain morphine and have been reported to show positive for Heroin. See references 3, 16, 17, 20, 21, 25, 26, 29, and 32.

Subj: Xophenex
Date: 3/11/2010
Can the inahler Xophenex give a false positive reading for cocaine?

AskDocWeb: There was one report of a false positive involving Xophenex but they were also taking other meds that could have caused that result. The Xopenex inhaler contains levalbuterol, which is not on the list.

Subj: False positive
Date: 3/11/2010
My probation officer drug tested me today and said I tested positive for opiates & methamphetamine. I am taking the following: 150mg Brupropion HCL XL, 5-500 mg Glyburide-Metformin, 40 mg Simvastatin, 81 mg Aspirin EC 81 and 150 mg Ranitidine. What could have caused a false possible reading?

AskDocWeb: According to the New York State Office of Alcoholism and Substance Abuse Services, Ranitidine may show up as a false positive for Amphetamines on urine drug screens. Three references (12, 31, and 32) say that Bupropion (Wellbutrin) could show up as a false positive for Amphetamines.

Subj: Bayer Asprin?
Date: 3/12/2010
I went for a suboxone appointment today. I currently take 2 8mg and 1/2 8mg Suboxone per day. I also take kolodipin 1 mg twice daily. Last off all I take 10mg of Lexapro. Using the Suboxone I experience headaches so I have been taking Bayer asprin. The DR looked, and said that would not cause false positive for THC, but on the list it is on here. The DR cut my dose, and I have to go back in a week (another $75.00) to be drug tested. Will Bayer asprin or Bayer products cause a false positive?

AskDocWeb: Only 2 Bayer products are on the list, Bayer Select Pain Relief Formula and Bayer Select Maximum Strength Sinus Pain Relief Caplets. Bayer Asprin is not on the list.

Subj: Indomethacin
Date: 3/12/2010
Hi my husband tested postive on his drug test but we are not sure yet can indomethacin cause him to test positive?

AskDocWeb: Indomethacin is not on the list of possible causes of false positives.

Subj: False positive?
Date: 3/12/2010
My friend takes Lialda, prednisone, prilosec and methotrexate for ulcerative colitis. Can any of these cause a false positive reading on a drug test?

AskDocWeb: None of those drugs are on the list of causes for a false positive.

Subj: Certified lab?
Date: 3/14/2010
I’m a chronic pain patient, I take Duragesic patch and Norco for b/t and had a random drug test in Dec. and I was told it tested positive for Methadone, so they gave me another one and if I fail it I will be discharged. I didn’t take any Methadone, but I’ve seen on your site MANY cold meds that cause false positives, so shouldn’t Dr. be aware of that? They just put that I was taking OTC cold meds? What could cause that? Also, if I find out name of lab can you tell me how I can find out if its certified?

AskDocWeb: If you find the name of lab you can look them up on the internet. Most labs have a website and publish the details of their certification, which is one of the selling points for their services.

Subj: Green or black tea?
Date: 3/15/2010
I was wondering if any type of green or black tea could test positive for amphetamines?

AskDocWeb: No, the only tea reported to cause any problems with drug screening is that made from Coca, which may show up as cocaine.

Subj: Positive for Amphetamines
Date: 3/16/2010
I am pregnant and I had surgery on my cervix. When they took my urine they said it came back positive for Amphetamines. I have never taken drugs before and was wondering if any of the pills i am taking will give a false positive. I took Prednisone, Zofran, Valtrex, and Metronidazole. I take amlodipine besylate, and Labetalol HCL. I am asking because I never had this problem before. Could a blood test clear up a false positive in a urine test. Please Help!

AskDocWeb: None of the drugs you list have been reported to cause a false positive for Amphetamines but that doesn’t mean that the test result is valid. The appropriate test to clear up a false positive on a urine drug screen is a Chromatograph/Mass Spectrometer (GC/MS) test.

Subj: Amoxicillin and tonic water
Date: 3/19/2010
I just failed a hair drug test that tested positive for cocaine. I don’t do cocaine. Ever. I do take alot of amoxicillin which I have a perscription for and I drink tons of tonic water which the research I have done says can make you test positve for cocaine. What do I do?? PLEASE HELP. THANK YOU.

AskDocWeb: You could tell them that you believe the results are false positive and the results need to be confirmed with a GC-MS test. You may have to pay for the additional testing but it is worth it. If you let the result go without confirmation then the results may become a permanent part of your medical record.

Subj: Xenadrine Ultra?
Date: 3/20/2010
Does Xenadrine Ultra cause a positive UA for any drug because I’m on probation and I am a clean person and I dont want a bad UA.

AskDocWeb: There are no reports of Xenadrine Ultra showing up in any urine drug screens.

Subj: Drug screen
Date: 3/20/2010
My name is john and I am a police officer. I recently was prescribed the drug restoril which is a benzodiazepine for a sleep aid because my wife and I lost a child, due to taking this medication I tested positive on a pre=employment drug screen. I have confirmation from the nurse practioner who prescribed me the medication that it would show in a drug screen, and also told the clinic that preformed the test that it would possibly show up but the results they sent to the potential employer still showed a positive drug test. What I would like to know is that wrong since I could show proof it was a as needed med and a prescribed one should it have shown as a false positive. If anyone has any comments please help because this is the first time ever in taking drug test I have tested positive even a false one.

AskDocWeb: Since you were prescribed and taking a benzodiazepine then it should have shown up in the test. That is not a false positive but rather a confirmation that you were taking your medication. If you were denied employment because of the result of the drug screen then you may want to talk to an attorney that specializes in employment law.

Subj: Dirty for benzos
Date: 3/21/2010
I am coming up dirty for benzos and have not taken anything. I am on methadone, pamprin, ibuprofen, and I was recently at the dentist and had novacaine. Is there anyway that could cause a false postive for benzodiapenes? I am about to lose my residence over it.

AskDocWeb: Sorry Beth, nothing you list has been reported to cause a false positive for benzos.

Subj: False positive for methamphetamines?
Date: 3/21/2010
I am taking presriped propo-n apap 100, acai and milk thistle dietary supplements, whole body cleanse laxative formula, and fiber fusion. Can any of these produce a false posive for methamphetamines? Thanks,

AskDocWeb: No, so far the only products reported to show up as a false positive for methamphetamine in urine drug screens are Accutrim, Adderall, Afrin, Allerest, Bronkaid, Cathne, Combivent inhaler, Contact, Desoyn, Dexatrim, Diabetes, Dimetapp, Dimethylamphetamine, Elderpryl, Ephedrine, Fencamine, Marax, Mesocarb, Morazone, Nyquil, Phenylpropanolamine (PPA), Redux, Sudafed, Tavist, and Vicks Nyquil.

Subj: Phenegren(Promethazine)
Date: 3/22/2010
Can Phenegren(Promethazine) cause a false positive for THC on a drug test? My doctor has never heard of this drug causing it? Thank You. Sincerely,

AskDocWeb: Phenergan (Promethazine) is frequently misspelled as phenegren. This is the prescription drug that is used for to treat allergy symptoms, prevent nausea and vomiting due to motion sickness, is often used to treat cold symptoms. There are 3 references that say that it has shown up as a false positive for THC (3, 16, and 18).

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