What antihistamines can cause a false-positive?

What antihistamines can cause a false-positive?

Antihistamines and some sleep aids containing diphenhydramine (like Benadryl) could cause a false positive result for PCP or methadone. Doxylamine (the active ingredient in Unisom) can also trigger a positive drug result for methadone, opiates, and PCP.

Can allergy medicine cause positive drug test?

Diphenhydramine (Benadryl) is an antihistamine found in allergy medications like Benadryl and sleep aids like Tylenol PM and Advil PM. If you’ve taken diphenhydramine, your drug screen may show a positive result for opiates, methadone, or PCP.

Can antihistamines cause failed drug test?

Determining what OTC products patients are taking is very important when using UDS testing, as some OTCs may cause false-positive results. Antihistamines, analgesics, cough suppressants, and heartburn medications have been shown to cause false-positives in studies and case reports.

What will give you a false positive for methamphetamine?

Any medication that includes one of these ingredients could cause a false-positive for a methamphetamine drug test. Common medications with these ingredients are cold medicines and nasal decongestants , such as Sudafed, NyQuil, Vick’s Inhaler and Dimetapp.

Can ranitidine cause a positive drug test?

Yes, ranitidine is known to cause a false positive for amphetamines. If you have taken ranitidine be sure to tell the personnel taking the test.

What drugs cause false positive for benzodiazepines?

There are multiple medications that are known to cause “false positives” for “benzos”, also known as benzodiazepines. Common benzodiazepines include: Xanax (Alprazolam) Librium (Chlordiazepoxide) Onfi (Clobazam) Klonopin (Clonazepam) Tranxene (Clorazepate) Valium (Diazepam)

What drugs cause false positive for amphetamines?

Some more commonly prescribed prescription medicines that may cause a false positive reading for amphetamines include: Amantadine, Bupropion, Chlorpromazine, Desipramine, Dextroamphetamine, Ephedrine, labetalol, Methamphetamine, Methylphenidate , Phentermine , Phenylephrine , Promethazine, Pseudoephedrine , Ranitidine , Selegiline ,…