FDA oversight of household products, dating as far back as the 1927, grew considerably in the ‘60s with the Hazardous Substances Labeling Act and the Child Protection Act. 10, depending on the possible cause false positive pregnancy test. that cause false positives on the drug test. Not affect your system to cause false positive. What is a false positive test company testing what causes a false positive result can test lead to false positive results does the provigil cause a false positive on test One of the most common antibiotics, amoxicillin (Amoxil), can cause a false-positive test for cocaine. Quinolones, a group of antibiotics including ofloxacin (Floxin), levofloxacin (Levaquin) and ciprofloxacin (Cipro), may produce false-positive tests for amphetamines and opioids. I know for a fact amoxicillin tests you positive for cocaine , I had a positive test and the only thing I took was amoxicillin I was prescribed by the doctors , its on my records , and the only bit of the test that showed up positive was when I took the amoxicillin , the other bit is clear , I think people going in for hair and urine tests. The hair follicle test is a two step process for those who test positive it actually matches the drug you test positive for by chemical make up sort of like a DNA sample. If you test positive and you are absolutely sure you are not using, get one heck of an attorney and fight it, but word of caution: these tests are known for hardly ever having a false positive. For instance, amoxicillin has been associated with a false positive urine test for cocaine. There had been several cases involving drug users who intend to manipulate test results by using commercial urine, diluting urine with water or taking other substances to mask the presence of drugs. I recently had a urine drug screen with a positive cocaine result. I have never used cocaine in my life!! I learned this weeks after my PCP received the results & dismissed me from her practice when i called to make an appointment and she refused to see me to discuss the test. There is absolutely no scientific evidence to support amoxicillin or an infection causing false positive drug tests for cocaine, benzodiazepine or marijuana if this test was confirmed with GC/MS or LC/MS. Amoxicillin - false positive for cocaine--- Do take your doctor´s prescription when they give you the test results. Before they did the test did you tell them you were on this medication?.