Urine drug testing

Immunoassays

Substance	False positives
Alcohol	Short-chain alcohols (e.g. isopropyl alcohol)
Amphetamines	Amantadine Benzphetamine Bupropion Chlorpomazine Clobenzorex l-Deprenyl Desipramine Dextroamphetamine Ephedrine Fenproporex Isometheptene Isoxsuprine Labetalol MDMA Methamphetamine Methylphenidate Phentermine Phenylephrine Phenylpropanolamine Protethazine Pseudoephedrine Ranitidine Ritodrine Selegiline Thioridazine Trazodone Trimethobenzamide Trimipramine
Benzodiazepines	Oxaprozin Setraline
Cannabinoids	Dronabinol Efavirenz Hemp-containing foods NSAIDs Proton pump inhibitors Tolmetin
Cocaine	Coca leaf tea Topical anesthetics containing cocaine
Opioids, opiates, and heroin	Dextromethorphan Diphenhydramine Heroin Opiates (codeine, hydromorphone, hydrocodone, morphine) Poppy seeds Quinine Quinolones Rifampin Verapamil and metabolites
Phencyclidine	Dextromethorphan Diphenhydramine Doxylamine Ibuprofen Imipramine Ketamine Meperidine Mesoridazine Thioridazine Tramadol Venlafaxine and desvenlafaxine
TCAs	Carbamazepine Cyclobenzaprine Cyproheptadine Diphenhydramine Hydroxyzine Quetiapine