What ingredients can cause a false positive drug test?
What ingredients can cause a false positive drug test? Drugs that can cause false positives 1) Dextromethorphan. Dextromethorphan is an active ingredient in Robitussin, Delsym, and other over-the-counter cough suppressants. 2) Diltiazem. 3) Diphenhydramine. 4) Metformin. 6) Labetalol. 9) Tramadol. 10) Phentermine. 11) NSAIDs. Can a diluted drug test still be positive? Sometimes dilution is […]