I RECENTLY TOOK A DRUG URINE TEST. I AM 63 YEARS OLD AND DO NOT EVER BOTHER ANY STREET DRUGS, BUT I TESTED POSITIVE FOR AMPHETAMINES. I TAKE OTC CLAIRITIN D SINUS PILLS AND I HAVE A DOCTORS PRESCRIPTION FOR DAILY FEXOFENADINE 180 MG. I TAKE THE CLAIRITIN PILLS BETWEEN REFILLS OF THE FEXOFENADINE PILLS. I HAVE ALSO TAKEN THE COLD MEDICINE ZICAM AND NIGHTQILL AND DAYQUILL. WOULD THIS HAVE CAUSED A FALSE POSITIVE AND WHAT STEPS TO TAKE AT THIS POINT. THIS WAS A ROUTINE MEDICAL SCREEN FOR TRAMADOL REFILLS.