Find relief from muscle pains, minor arthritis pain, toothaches and headaches, and reduce fever with MOTRIN® IB, which contains ibuprofen. Medicines can often interact with pre-existing conditions. In this article, we look at the effects of ibuprofen in people with asthma. What Cause A False Positive For Oxycodone. What cause a false positive for oxycodone. It is very possible to get a false positive from DXM. If that's the only substance you were taking at the time, it's possible that it was the DXM. Doctors give unbiased, helpful information on indications, contra-indications, benefits, and complications: Dr. King on what causes false negative d dimer: There is no simple positive or negative for a D-dimer. A value is reported to a physician and he/she uses this to gauge the likelihood of a thrombus / DIC. Abstract and Introduction Abstract. Purpose. The implications of potential false-positive urine drug screen (UDS) results for patients receiving commonly prescribed medications were evaluated. Buy Nurofen 200mg tablets - 16 tablets. Collect 4 Advantage Card Points for every pound you spend. Oxycodone, I took between 7 to 11 per day the 5 Mg ones. This mental fog is really getting to me and making it very hard to do any thing. Which is not an option. The medicines that I had listed above can give a false positive test for methamphetaime and amphetamine both. So, if you have tested false positive for methamphetamine, then any of the above class of medicines e.g. cold medicine, diet pills, nasal sprays, asthma medicines etc can cause a false positive for methamphetamine. Find out which drugs can potentially cause a false positive drug test including additional details on the more commonly used substances. My daughter showed positive results for marijuana on a urine drug test. The only meds that she took prior to the test was naproxen.