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Does Lidocaine Ointment Cause False Positive Test Results For Cocaine?

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Posted on Fri, 18 Sep 2015
Question: This question is complicated. If I am on dialysis waiting on a transplant and also on pain management for several different issues and they have prescribed lidocaine ointment for me as well as my pain medication. If I put the lidocaine ointment on a tooth for I was having a toothache on the day of my swab test which I inform them about would I test positive for cocaine? I am confused over this result
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Answered by Dr. Dr.Albana Sejdini (1 hour later)
Brief Answer:
No,lidocaine ointment won't cause false positive cocaine test...

Detailed Answer:
Hi,

I am sorry for the situation you are in.

Lidocaine ointment itself won't cause a false positive cocaine drug test.
Kidney problems, especially kidney infection can cause a false positive testing.
Furthermore, if you have been using antibiotics (like penicillins) recently, those can also cause false positive cocaine drug test.

Try to relax and do not see it as a problem. You can repeat the testing after a few days.

All the best! Let me know if you have further queries!
Dr.Albana
Note: For more detailed guidance, please consult an Internal Medicine Specialist, with your latest reports. Click here..

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Dr.Albana Sejdini

General & Family Physician

Practicing since :2006

Answered : 7309 Questions

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Does Lidocaine Ointment Cause False Positive Test Results For Cocaine?

Brief Answer: No,lidocaine ointment won't cause false positive cocaine test... Detailed Answer: Hi, I am sorry for the situation you are in. Lidocaine ointment itself won't cause a false positive cocaine drug test. Kidney problems, especially kidney infection can cause a false positive testing. Furthermore, if you have been using antibiotics (like penicillins) recently, those can also cause false positive cocaine drug test. Try to relax and do not see it as a problem. You can repeat the testing after a few days. All the best! Let me know if you have further queries! Dr.Albana