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