Medications & Substances Causing False Positives

False positive drug test results is a major problem. According to a report by the Los Angeles Times New Service, a study of 161 prescription and over the counter medications showed that 65 of them produced false positive results in the most widely administered urine test. Inaccurate urine drug testing which can report false positive drug test results has been called an "epidemic" by Ronald Siegel, a psychopharmacologist at UCLA. He has said that 'The widespread testing and reliance on tell-tale traces of drugs in the urine is simply a panic reaction invoked because the normal techniques for controlling drug use haven't worked very well. The next epidemic will be testing abuse."

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Substances that cause False Positive Drug Test Results

THC - Substances or Conditions which can cause false positives

  • Dronabinol (Marinol)
  • Ibuprofen; (Advil, Nuprin, Motrin, Excedrin IB etc)
  • Ketoprofen (Orudis KT)
  • Kidney infection (Kidney disease, diabetes) Liver Disease
  • Naproxen (Aleve)
  • Promethazine (Phenergan, Promethegan)
  • Riboflavin (B2, Hempseed Oil)

Amphetamines - Substances or Conditions which can cause false positives

  • Ephedrine, pseudoephedrine, propylephedrine, phenylephrine, or desoxyephedrine
    • (Nyquil, Contact, Sudafed, Allerest, Tavist-D, Dimetapp, etc)
  • Phenegan-D, Robitussin Cold and Flu, Vicks Nyquil
  • Over-the-counter diet aids with phenylpropanolamine
    • (Dexatrim, Accutrim)
  • Over-the-counter nasal sprays
    • (Vicks inhaler, Afrin)
  • Asthma medications
    • (Marax, Bronkaid tablets, Primatine Tablets)
  • Prescription medications
  • (Amfepramone, Cathne, Etafediabe, Morazone, phendimetrazine, phenmetrazine, benzphetamine, fenfluramine, dexfenfluramine,dexdenfluramine,Redux, mephentermine, Mesocarb, methoxyphenamine, phentermine,amineptine, Pholedrine, hydroymethamphetamine, Dexedrine, amifepramone, clobenzorex,fenproyorex, mefenorex, fenelylline, Didrex, dextroamphetamine, methphenidate, Ritalin,pemoline, Cylert, selegiline, Deprenyl, Eldepryl, Famprofazone)
  • Kidney infection
  • Kidney disease
  • Liver disease
  • Diabetes

Opiates - Substances or Conditions which can cause false positives

  • Poppy Seeds
  • Tylenol with codeine
  • Most prescription pain medications
  • Cough suppressants with Dextromethorphan (DXM)
  • Nyquil
  • Kidney infection, Kidney Disease
  • Diabetes, Liver Disease

Ecstacy - Substances or Conditions which can cause false positives

  • Ephedrine, pseudoephedrine, propylephedrine, phenylephrine, or desoxyephedrine
    • (Nyquil, Contact, Sudafed, Allerest, Tavist-D, Dimetapp, etc)
  • Phenegan-D, Robitussin Cold and Flu, Vicks Nyquil
  • Over-the-counter diet aids with phenylpropanolamine
    • (Dexatrim, Accutrim)
  • Over-the-counter nasal sprays
    • (Vicks inhaler, Afrin)
  • Asthma medications
    • (Marax, Bronkaid tablets, Primatine Tablets)
  • Prescription medications
  • (Amfepramone, Cathne, Etafediabe, Morazone,phendimetrazine, phenmetrazine, benzphetamine, fenfluramine, dexfenfluramine, dexdenfluramine,Redux, mephentermine, Mesocarb, methoxyphenamine, phentermine, amineptine, Pholedrine, hydroymethamphetamine, Dexedrine, amifepramone, clobenzorex, fenproyorex, mefenorex, fenelylline, Didrex, dextroamphetamine, methphenidate, Ritalin, pemoline, Cylert, selegiline, Deprenyl, Eldepryl, Famprofazone)
  • Kidney infection
  • kidney disease
  • Liver disease
  • diabetes

Cocaine - Substances or Conditions which can cause false positives

  • Kidney infection (kidney disease)
  • Liver infection (liver disease)
  • Diabetes
  • Amoxicillin, tonic water


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