Feedback on False Positives from Drug Testing, page 18

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: MaHuang with ephedrine
Date: 7/20/2007
I was wondering if a diet supp that contains MaHuang and a proprietary blend of ephedrine can cause a false positive on a GC/MS urinalysis. If so, how can I get documented proof!


AskDocWeb: You would have to take a bottle to a forensic toxicologist for testing. However, locating one that will work with you is no easy task. They typically work for law enforcement agencies.

Subj: Send me all articles?
Date: 7/21/2007
Please send me all articles or comments on the false positives of cocaine … Any corresponding statistics about antibiotics and their relationship to false positives.


AskDocWeb: Sorry Douglas, we don’t send anything by email, you’ll have to do your own research.

Subj: Doxycycline
Date: 7/22/2007
I am currently taking doxycycline for a cold prescribed by a doctor. I have a pre employment drug screen in 1 day, will this show up anything.


AskDocWeb: No this should not show up on a drug screen unless you are overdosing.

Subj: Omeprazole
Date: 7/22/2007
Please see Test Interaction section of the attached. I am prescribed 40mg omeprazole per day due to history of perforated ulcer. I tested positive for THC as a result.


Subj: Nothing to hide
Date: 7/22/2007
I signed to have random urine screens and pill counts at my Dr.’s office because I had nothing to hide. I take several medications, I take 150Mg wellbutrin 2 in morning, 20mg prilosec 2x day, elmirin 100mg 1 x day, adderal 30mg 2 x day, 3 100mg colace a day, zoloft 50mg 1 x day,1 Multi vitamin, calcium/vitamin d 500mg and l-lysine vitamin all in the morning. In afternoon another 20mg prilosec and 30mg adderal. At night 1 2mg clonzapam and 1 neuroyin 300mg before bed. I get 1 vitamin b12 shot a month after test I got certified letter from Dr saying I had been dropped because none of the medications prescribed showed up in my system. How can that be possible. I’m so confused. I also take lortab as needed for pain for my osteoporosis I have it severe enough to break a bone. I’ve been trough cancer and radiation. Do you have any ideal what went wrong? Now I’m having trouble getting another family doctor.


AskDocWeb: We’ve not heard of a case where the drugs you’re taking did not showing up in tests, it’s a mystery.

Subj: Drug list
Date: 7/23/2007
I am currently taking these drugs on a daily basis: Lasix 40MG, Triamterene-HCTZ 75-50MG, Diovan 80MG, Advair inhaler 250-50MCG/DOSE, Ambien 10MG, Levothyroxine 175MCG, Levothyroxine 50MCG, Flonase Inhaler 50MCG/DOSE, Albuterol Inhaler 1.25MG/3ML, Lamictal Oral Tablet 100MG, Aspirin Buffered 325MG None of these are on the list, however I just wanted to know if any of these used TOGETHER would cause them to produce a false positive on an employment urine drug screening test?


AskDocWeb: (answer revised 6/30/2011) No combination of the drugs listed has been reported to cause a false positive. However, the Lamictal (Lamotrigine) alone may test positive for PCP.

Subj: Positive for Barbituates
Date: 7/23/2007
My daughter was tested at the hospital and it came back positive for Barbituates, Can Advil taken 2 days before or Valtrex taking a week or 2 before cause a false positive?


AskDocWeb: Advil has been reported to cause a false positive but not Valtrex.

Subj: Some liquid injected in me
Date: 7/25/2007
I am in the military and have recently failed two urine tests within 8 days of each other for cocaine. The first was (171ng) and the second was (565ng) I was diagnosed one week before for mental health and was given a CATscan and they used some liquid they injected in me for that I am not sure what it was but it made me warm and left a metallic taste in my mouth. Also I was prescribed Celexa and Seroquil would any of these cause me to come up positive on a UA? I have never even seen cocaine in person before and am about to lose my 15 year career. Thank you for any help you can give me.


AskDocWeb: Seroquel is prescribed for schizophrenia and Celexa for depression and neither have been reported to cause a false positive.

Subj: Medication in that class
Date: 7/25/2007
I recently tested positive for benzodiazpines, but have not taken any medication in that class. Can you tell me if there is anything that would give a false positive? I am very concerned, since I did not take anything. Thanx,


AskDocWeb: Benzodiazepines or “benzos” for short, are a class of drug (sedative-hypnotic agents) commonly known as tranquilizers and sleeping pills. They are used for anything associated with anxiety or sleeping problems, agitation, seizures, and muscle spasms, as well as alcohol withdrawal. Maybe the following list will jog your memory.

  • Alprazolam
  • Kalma
  • Xanax
  • Bromazepam
  • Lexotan
  • Clobazam
  • Frisium
  • Clonazepam
  • Rivotril
  • Diazepam
  • Valium
  • Ducene
  • Antenex
  • Flunitrazepam
  • Hypnodorm
  • Rohypnol
  • Lorazepam
  • Ativan
  • Nitrazepam
  • Mogadon
  • Alodorm
  • Oxazepam
  • Serepax
  • Alepam
  • Murelax
  • Temazepam
  • Euhypnos
  • Nocturne
  • Temtabs
  • Temaze
  • Normison
  • Triazolam
  • Halcion
  • chlordiazepoxide
  • librium

Subj: False positive from energy drink?
Date: 7/30/2007
Zyrtec, w/a energy drink called “Emer’gen-C” it contains MSN 1,000mg will this combination along with Hydrocodo/ASAP 7.5-500 and Gabapentin and Amitriptylin cause a result of false positive for Meth use. I was told that my urine test result came back positive for Meth and I have no clue how this could be possible. My “new” first time RN and physician ran the test for my pain treatment contract. Hydrcodo/APAP 7.5-500 prescription was denied due to the results. What should I do? The RN won’t even speak to me now. This is crazy! 3 days now without my hydrocodone and dealing with pretty bad withdrawal symptoms… 17 days before I can get a Dr. visit with my primary Dr. and it will be my first visit with him as he is my new Dr. What a nightmare this is! Thanks for any help you can recommend.


AskDocWeb: Who knows what is in the energy drink, but the hydrocodone may get you in trouble. It sounds like you need to seek a pain management specialist to help you. Several people have reported testing positive after consuming energy drinks, enough so that it is beginning to make us wonder if there may be a problem.

Subj: Showing cocaine
Date: 7/31/2007
I had surgery Monday and a week later was given a mouth swab test for work. I do not do drugs however it’s showing cocaine. I have no idea what the doctors gave me however they put me out and I was on a breathing machine through out the surgery. I was also given some kind of Tylenol. I’ve called the surgeon 5 times now about this and he has not replied to me yet. If I can’t find a reason why this will show up as it did then I wont get the job anyway…Please, any help?


AskDocWeb: All you can do is to be firm on getting an answer from the surgeon. It is possible to go over the surgeon’s head to request action.

Subj: Alli
Date: 8/2/2007
My question is if you can get a false positive by taking Alli (orlistat)?


AskDocWeb: No, not if you use it as directed.

Subj: Still testing positive for THC after 60 days
Date: 8/5/2007
I stop smoking marjuana 60 days ago. I am taking six 50mg of Tramadol by prescription from my doctor for chronic pain. I am still testing positive for THC after 60 days. Is Ultram/tramadol the reason I am testing positive? Help me because my doctor will stop my pain medication if I can not determine why I am still testing positive for THC after 60 days.


AskDocWeb: On 2/5/07 a post from Jeff reported that the drug gives a false positive for PCP in a urine test.

Subj: Hot cocaine result
Date: 8/9/2007
I had a hot cocaine result from a urinalysis and didn’t take cocaine. What caused this? I have diabetes and hep-c and I am prescribed ibuprofen, Valium, tamazapam and Oxycontin. Could this have caused a false positive?


AskDocWeb: It is possible, Ibuprofen has been reported to cause a positive for THC, Valium positive for PCP, and Oxycontin for opiates.

Subj: On probation
Date: 8/12/2007
I am on probation and I am taking hyrocodone and oxycodone and tylnol 3 with codine, would I fail for cocaine?


AskDocWeb: Probably, but we have wonder why are you taking drugs if you are concerned about failing a drug test?

Subj: Still showing positive
Date: 8/13/2007
hi I need your help on some very important information. I have been officially sober and off any type of benzodiazepines for the past forty days. However, I keep on doing quantitative urine tests for benzos and it has been showing positive for the past 40 days, also going up to high numbers. I was on prozac, seroquel and stomach pain meds such as flagyl, antinal. I stopped all these meds 2 weeks ago and still show positive. What can it be? I haven’t been taking any meds for 2 weeks and off benzos for 40 days but having very unfortunates tests results. Help,


AskDocWeb: What ever is causing the positive hasn’t had enough time to get completely out of your system.

Subj: Zyprexa?
Date: 8/14/2007
Can Zyprexa cause a false positive for benzodiazepine?


AskDocWeb: Not to my knowledge.

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