Can Marcaine cause a positive test for cocaine after a

Patient

Q: Can Marcaine cause a positive test for cocaine after a few days of being injected

Doctor

A:   Hello
Welcome to Ask The Doctor.

When testing for cocaine, the lab is actually looking for its unique metabolite, benzoylecgonine. 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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