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Medications
& Substances
Leading to False Positives on Drug Tests
The following is a list of products our donor's must avoid so that there is absolutely
no chance of a false positive. Maintaining a "pure and clean" lifestyle is largely what contributes to the high price of clean
urine.
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
Some
more items reported as causing false positivs on drug tests 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.
Syva labs has recently reworked its Cannabinoid test and claims
to have eliminated this problem. But a Science magazine article
(July 8, 1988) lists Ibuprofen as cross reactive. Under the new
government guidelines THC testing levels will be reduced to 50
nanograms. Many more THC false positives can be expected in 1994.
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 at the back
of this booklet, 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
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
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.
Your own enzymes. A small fraction of the population excrete
large amounts of certain enzymes in their urine which can produce
a positive drug test. Dr. John Morgan of the Dept. of Pharmacology
of New York City University writes: "A false positive test
could occur in some individuals because they excrete unusually
large amounts of endogenons lysozyme or malate dehydrogenase."
Dr. Morgan judges that natural enzyme interference may run as
high as 10% of positive samples.
Black Skin. This is not a joke! Those of African origin, certain
Orientals, or pacific Islanders might test positive for marijuana.
Dr. James Woodford, a toxicologist associated with Emory University
labs hypothesized the pigment melanin which protects the skin
from the sun, approximates the molecular structure of the THC
metabolite to cross react on the marijuana urine test. Dark skinned
Caucasians such as those from the subcontinent of India could
also read positive on marijuana tests. The body eliminates some
melanin in a dark person's urine sample.
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.
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