Here is a short list of drugs that have been known to cause false positives


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Here is a short list of drugs that have been known to cause false positives.
 

There are more than 250 over-the-counter medications and prescription drugs that could cause a False Positive.

Byrd Labs has in its possession an internal document from the Syva Company, makers of the widely used EMIT test. This document, leaked by a disillusioned company employee, lists more than 250 over-the-counter medications and prescription drugs that can cause false positives.

In today's drug testing world, a false positive is defined as a drug free sample falsely being reported as showing positive for drugs. This can occur for a number of reasons including: improper laboratory procedure, mixing up samples, incorrect paperwork and passive inhalation. But the most common cause of drug testing false positives are cross reactants. A cross reactant is a substance which because of its similar chemical structure to a drug or its metabolite can cause a false positive result.

So filling out the lab test form to include over the counter medications that cause the same positive results as the illegal drug might be a good idea. If a positive result occurs on the test, a basis will have been laid for an appeal. Remember that the negative error rate is just as large or larger than the positive error rate. Many people using drugs escape detection.

Among the items reported as causing false positive test results are:
Pain relievers such as Advil, Nuprin, Motrin and menstrual cramp medications like Midol and Trendar. All drugs containing the widely used pain reliever Ibuprofen are known to cause positive samples for Marijuana. Non-steroidal anti inflammatories such as Naproxyn have cross reacted in blind tests. These are often prescribed for runners, sports injuries to joints, and those suffering from arthritis.

Dristan Nasal Spray, Neosynephren, Vicks Nasal Spray, Sudafed, etc. and others containing ephedrine or pnenypropanolamine. Over the counter appetite suppressants which contain propanolamine. Most common nasal decongestants can cause a positive reading for Amphetamines. As the cross reactive list suggests, amphetamine false positives are the most common. Recent articles in the Journal of Clinical Chemistry ,Vol. 38 No.12 1992 and Vol. 39 No.3 1993 warn that medications containing chloropromazine, fluspirilene, and others may yield a positive when tested for amphetamines.

Vicks Formula 44M containing Dextromethorphan, and Primatene-M containing perylamine as well as the pain reliever Demerol, and prescription anti-depressant Elavil test positive for opiates for up to three days. Even Quinine water can also cause a positive reading for opiates.

Poppy Seeds such as the ones on a bagel from your favorite deli, etc. The journal of Clinical Chemistry Vol.33 No.6, 1987 reports: "the quantities of poppy seed ingested in this study (25 and 40 g) may be expected to be contained in one or two servings of poppy seed cake. Therefore, poppy seeds represent a potentially serious source of falsely positive results in testing opiate abuse." Clinical Chemistry goes on to conclude: Not only is it difficult to distinguish heroin or morphine abuse from codeine, but dietary poppy seeds can give a strong positive result for urinary opiate of several days duration that is confirmed by GC/MS analysis".

Nyquil Nighttime Cold Medicine will test positive for Methadone for up to two days.

Antibiotics. Certain newly developed antibiotics have cause positive samples urine tests. Ampicillin is suspect. Amoxicillin has caused positives for cocaine.

Diazepam tests positive for PCP as well as the ingredient in some cough medicines, Dextromethorophan.

Passive marijuana inhalation. If you attend a rock concert or ride in a car where marijuana is smoked nearby, even if you do not partake, the second hand marijuana that you might inhale may give your test a positive result for several days.

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. Ronald Siegel, a pharmacologist at UCLA said '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."

More Defined List of Substances that can 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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