* Approximation only. Used for sinus and nasal congestion, pseudoephedrine (Sudafed) can be the cause of false positive tests for amphetamine or methamphetamine. When an antibody binds to a compound (like gabapentin), it produces a reaction, which is then … Some reports may have incomplete information.Patients can bring a copy of the report to their healthcare provider to ensure that all drug risks and benefits are fully discussed and understood. This could cause false positives in tests for opiates and PCP.Pseudoephedrine, or Sudafed, could cause false positives for amphetamine or methamphetamine.Over-the-counter sleep aid drugs, like Unisom, may also lead to false positive results for PCP and methadone.Some weight loss medications have caused false positives in amphetamine urine tests. The study is created by eHealthMe based on reports of 186 people who take Neurontin and Sudafed from the FDA, and is updated regularly. Phentermine is one prescription that could cause this.ADHD Medications, such as Ritalin (methylphenidate) are known to cause false positives tests for LSD, amphetamine, and methamphetamine.Several different antidepressant medications have the potential to cause false positives. Drug interactions are reported among people who take Neurontin and Sudafed together. Ethanol is a simple grain alcohol. Answered on Apr 23, 2018. If you’re taking labetalol, you could have a false positive test for amphetamine, methamphetamine, or LSD. eHealthMe has been monitoring drugs … Use of this site constitutes acceptance of eHealthMe.com's terms of service and privacy policy. does gabapentin cause a false positive on a urine drug test? This is a antiretroviral medication used to treat HIV infection.Chlorpromazine may cause false positives for amphetamine.Quetiapine could lead to a false positive for methadone in a urine test.Medications used to treat hypertension, such as Cardizem (Diltiazem) could lead to a false positive on a urine LSD test.Metformin, a common prescription for diabetes treatment, has led to some positive results in tests for amphetamine or methamphetamine.We Are In-Network with Most Major Insurance Companies© Copyright 2020 Silver Pines Treatment Center. ... Why Do False-Positives Happen? All rights reserved. Dr. Paul Grin answered. It is recommended that patients use the information presented as a part of a broader decision-making process.If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.© 2020 eHealthMe.com. The presence of ethanol may be detected in an alcohol urine screening.Right after a large amount of exposure to marijuana, THC may appear in a urine test. However, it is possible for a test to have a false positive result. This is because poppy seeds naturally have small amounts codeine and morphine.Some tests detect even a trace amount of alcohol. Aleve, or naproxen, may also lead to a false positive for barbiturates of THC.Benadryl, Tylenol PM, Advil PM, and other medications contain diphenhydramine. This could lead to positive results in screenings for methadone, PCP, or opiates.False positives for marijuana screenings could occur as a result of taking Sustiva (Efavirenz). Most urine drug tests are known as 'immunoassay' screenings since they utilize antibodies to bind to a particular drug substance in a sample. 1,2 Dilute urine, the duration of time between ingestion of the drug and time of testing, and the quantity of the drug ingested may affect the occurrence of false-negatives. 0. A retrospective chart review of 10,011 urine drug screens found that of 362 initial positive amphetamine tests, 128 (35%) were false positives. The chemical structure is sigificantly different than that of benzos. 12 A case report also described a patient taking 300 mg of bupropion daily and testing falsely positive for amphetamines. People may be asked to take a drug test for a few different reasons.