False-negatives and false-positives from immunoassays can lead to adverse consequences for patients and providers. By identifying medications that contribute to false-negatives and false-positives, pharmacists decrease misinterpretations from urine drug screens. Chloroquine dose in rheumatoid arthritis G6pd and hydroxychloroquine Stars. Plaquenil is the brand name for the prescription drug hydroxychloroquine. It's used to treat and prevent malaria infection, and to reduce symptoms and progression of autoimmune diseases such as lupus, rheumatoid arthritis, and others. Several of these medications for mental disorders can lead to false positive tests. Quetiapine, which treats schizophrenia and bipolar disorder, can wrongly show that you have methadone in your urine. Hydroxychloroquine - I believe this drug causes false positive drug test of THC? Asked by Boni6258 Updated 6 January 2018 Topics chloroquine, hydroxychloroquine, drug test, medication Pharmacists can provide guidance in selecting appropriate drug therapies that are less likely to cause false readings, thus decreasing the need for additional testing. Unexpected results from urine immunoassays should have a confirmatory gas chromatography–mass spectrometry or a high-performance liquid chromatography test performed. Plaquenil false positive methadone Toxicologic Testing for Opiates Understanding False., What Can Cause a False Positive Drug Test - WebMD Chloroquine kinaseChloroquine overdose amountRecommandation surveillance ophtalmologique plaquenilPlaquenil stopped working So how can two urine tests in a row come back positive for Methadone when I haven't taken any? Currently I am on Lisinoprilfor high blood pressure, Tramadol, Soma, Ibuprofen, Lortab 7.5 and Elaveljust at bed time to help me sleep. This combination of drugs has never triggered a false positive before. False Positive for Methadone -. Hydroxychloroquine - I believe this drug causes false.. Plaquenil Oral Uses, Side Effects, Interactions, Pictures.. Some false-positive results for methadone have already been reported with other techniques and were attributable to metabolites of verapamil, diphenhydramine, or doxylamine. In our patients, these compounds are not an issue of concern. False positives are a real problem at these clinics it seems. They tell me to not take any supplements such as pre-workouts. I recently had a urine sample come back positive for amphetamine. It's as caused by a herbal supplement called acacia rigidula. I couldn't have take homes until they retested. False-positive results for amphetamine and methamphetamine were the most commonly reported. False-positive results for methadone, opioids, phencyclidine, barbiturates, cannabinoids, and benzodiazepines were also reported in patients taking commonly used medications.