Feedback on False Positives from Drug Testing, page 116

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: Poppy seed rolls
Date: 1/13/2011
I’m on probation and drug/alcohol counseling from a DUI. I get tested on a regular basis (urine 5 panel) I just got flagged positive for opiates. I don’t USE any opiates and haven’t inadvertently taken anything which contains opium or codeine. I’ve asked for further testing, which is A GC/MS confirmation test I believe…will this clear me? I Do eat poppy seed rolls, but I’ve always done so and it never caused a problem before. The only thing out of the ordinary was I was taking Amoxicillan and Dayquil/Nightquil caps for several days prior to this test because I was sick with an URI. Again, will this improved test be able to differentiate and clear me?


AskDocWeb: Yes, that is the purpose of the confirmation test, to eliminate false positives. The GC/MS test can tell the difference between poppy seeds and opiate drugs.

Subj: Tested positive for Methadone and Hydrocodone
Date: 1/13/2011
I tested positive for Methadone and Hydrocodone. I did not take either one of the drugs but, I did take Nyquil and I do take large amounts of advil and Excedrin Migraine. Can there be a connection.


AskDocWeb: Yes, Nyquil Nighttime Cold Medicine has been reported to sometimes cause false positives for Methadone for up to 2 days after taking it. See references 1, 3, 11, 14, 16, 18, 19, 20, 26, 29, and 43.

Subj: Tested for methadone
Date: 1/14/2011
I had to take a drug test today at my pain doctor and it came back that I tested for methadone. I have never taken methadone. I am taking loratab and oxaprozin. What would make me test positive for methadone?


AskDocWeb: We are still researching Lortab, an opioid analgesic, and the affect that taking it produces on a urine drug screen. Right now we don’t know however, if your doctor substitutes another drug for the Lortab and the tests come back clear, that might be a hint.

Subj: Positive for methamphetamines
Date: 1/14/2011
16 yr old tested positive for methamphetamines twice and then three days after the second test negative (after being in detention so it was a controlled environment). She is currently taking Adderall but we have been told that should not cross from an amphetamine to meth. We’ve been told that large quantities of cold meds will test positive for meth – what sort of quantity might that be? She weighs around 110 lbs. She is in probation and the magistrate believes she is testing false-positive for the meth. I don’t want to look for a problem but if she is using, I can’t ignore it either.


AskDocWeb: While a false positive may be possible it is better not to guess with something this important. The question of whether or not the test was a false positive can only be answered by a confirmation test using either a Gas Chromatograph/Mass Spectrometer (GC/MS) or high-performance liquid chromatography.

Subj: Methadone, zoloft and soma
Date: 1/14/2011
I’m currantly in a program for substance abuse and im on a daily dose of methadone, and i take zoloft regular on a daily basis well i have had not one but 4 drug test come back positive for soma they say but the soma IS NEGITIVE AND THE METABRATE IS POSATIVE. CAN U HELP ME PLEASE. WHY IS THAT?


AskDocWeb: Sorry Anna, there is not enough information there to even guess what might be going on. By metabrate did you mean metabolite? The test can’t be both positive and negative for the same substance.

Subj: Reference to show authorities
Date: 1/14/2011
I recently failed a U.A. for PCP which is Angel Dust and also known as phencyclidine and it says there are no false reports for angel dust but on another page of this website in the list of chemicals known to fail your drug test it shows the exact over the counter medication Doxylamine I purchased recently, known to fail for phenyclidine ref.32, Unisom sleep aid tabs taken at directional dosage has just made me a 240lb. man fail my felony probation U.A. for PCP, I don’t even know where to get that stuff if I wanted it, I’ve never even seen that stuff in my life, just sayin though fix your page one or the other so I can use this site as a reference to show the authoritys. Thank you,


AskDocWeb: We research and publish the information on false positives with references for each one so that you can show those references to your authorities. In this case reference 32 is the New York State Office of Alcoholism and Substance Abuse Services. They are the source of the assertion that that particular false positive is possible.

Subj: Sudafed
Date: 1/15/2011
I took two sudafeds in 1/11 & took a swab test today 1/14 will i test positive? How long does it stay in your system? The fact that it expired last month matter?


AskDocWeb: Sorry Noey, our research was limited to urine drug testing. The oral swab testing and hair testing will have to wait until we get the resources to fund that research.

Subj: Positive for cocaine
Date: 1/16/2011
My finance is on probation he got random drug tested from his probation officer and he said his test come back positive for cocaine, vicodine, and percocet. He has a prescription for his pain medication but the cocaine is not true he does not do any other drugs and his PO wants to violate him. He does not have diabetes or kidney disease or drank tonic water is there anything else that could cause this? I know he is on arthritis medicine and tramadol, bayer asprin and adavan and epitol. I believe that is all his medications.


AskDocWeb: None the medications you list have been associated with false positives on urine drug screens. However, there are other possibilities so check this list.

Subj: Orlistat
Date: 1/17/2011
Can the main ingredient, orlistat, cause a positive urinalysis. I am mainly looking at the stuff in alli.


AskDocWeb: Orlistat does not appear to show up on urine drug screens. Since it has been on the market for almost 12 years, if it could have it would have by now. Orlistat is sold under the brand name of Xenical and the reduced dosage Alli.

Subj: AZO
Date: 1/17/2011
I have tested positive for taking AZO (an UTI or bladder infection) an over the counter medicine.


Subj: The house doesn’t know what to do
Date: 1/18/2011
I have been clean for 14 months and live in a clean and sober house where we give random UAs, we use the i-Cup instant drug tests and have never had a problem with false positives in the 13 months i have lived here. Tonight my name got drawn on the random UA, and all of the lines on the cup (two lines pass, one line fail) took forever to show, they usually show in less then 5 minutes, and when they did show they were extremely light in color, and the test strip for meth and THC were ether so light they couldn’t be seen or they failed. I know I have been clean, my sponsor knows I have been clean, and the guys I sponsor know have been clean, but the house doesn’t know what to do. Today before the UA in a 12-14 hour period I had one cup of coffee, one rockstar 16 ounce energy drink, and two monster 16 ounce energy drinks, and ate tuna sushi mi for dinner… Could any of this have messed with the UA?


AskDocWeb: The tuna sushi is safe, as far a drug tesing goes, but you might check the ingredients of your energy drinks against this list to see if they contain an ingredient that might cause a problem. It would seem that your house would want to find out if the test results were false positive or not. The only way to do that is to get a confirmation test and that would also get rid of any doubt cast by the test.

Subj: Positive test for meth
Date: 1/18/2011
I am on parole and have been for the last 30 months. December 17 & 22 2010 I have tested positive for meth, I have not used this drug since 2004, I am curruntly taking Tizanidine, and oxycodone, as well as oxybutynin. Can this some how give me a positive test for meth?


AskDocWeb: None of those have been documented to cause a false positive for meth.

Subj: False readings for THC?
Date: 1/20/2011
Hello I have been givin clarithromci, cyclobenzapr and viconin by my Dr. and would to know if these will give any false readings for THC or other.


AskDocWeb: According to the American Academy of Pediatrics Cyclobenzaprine has shown up as a false positive for Tricyclic Antidepressants (TCA) but not THC. The others have not shown up in the research on false positives.

Subj: Completely clean
Date: 1/20/2011
I had a urine screen yesterday come up positive for benzos, opiates, and amphet. I am completely clean. I am currently on Prozac 40mg, ceron-dm syrup and valarian root. I have had a false positive on benzos before for the valarian root, which they know. I am at ease after learning from your site that two ingredients in the cough syrup can cause false positves for the opiates and amphetamines, as well as the prozac for amphetamines. My question is “Will the lab results coenside with this?” I am completely clean so I am not worried, however blown away and scared by the whole process.


AskDocWeb: Yes, the confirmation test performed by the lab is designed to eliminate false positives.

Subj: Rhovane/zopiclone and venlafaxine
Date: 1/20/2011
Hi I am on Rhovane/zopiclone and venlafaxine. Will they give me a false positive? I just had a test and it was inconclusive! Thanks,


AskDocWeb: Effexor Tablets (venlafaxine hydrochloride) has shown up as a false positive for PCP (References 27 and 33).

Subj: Positive for PCP
Date: 1/21/2011
I had a tooth ache and then had tooth pulled during this i took the following excedrine pm amoxicillim 500 mg hydrocodone alprazolam, pluozetine 20 mg 4 per day.i also was taking methocarbamol and azo for unrine infection. when i wnt to take a ua they said i was positive for something called pcp how is this possible please help me out


AskDocWeb: Sorry Tina, none of those have been reported to cause a false positive for PCP. Sometimes the urine tests are just wrong without an apparent cause. If you believe your test result was a false positive then getting a confirmation test will show that.

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