Can Marcaine cause a positive test for cocaine after a

Patient : Can Marcaine cause a positive test for cocaine after a few days of being injected
Doctor :   Hello Welcome to Ask The Doctor. When testing for cocaine, the lab is actually looking for its unique metabolite, be nzoylecgonine. No other drug has this metabolite. If only a screening test is used, such as immunoassay, there is a possibility of Marcaine (bupivacaine) giving a false positive for cocaine. However, this can be clarified by using a confirmation test. Both a screening and confirmation test should be carried out if a person tests positive for cocaine. I hope it helps. Stay Healthy

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