What Causes False Positive For Cocaine While On Lithium,Buspar,Lexapro And Valium?

Posted on Mon, 30 Jun 2014

Question: Yes. I have MRSA which is being treated with Zyvox (Linezolid). I am also Bi-polar which is being treated with Lithium, Buspar, Lexapro, valium and Xanx. I am also be treated for pain management related to auto accident and recived oxycodone.

I am 58 years and a licensed professional. 18 days ago i took a drug test and it show positive for cocaine. I have never done cocaine. Which medications are causing this.This information is additional inadvertly omitted in the original facts.

I was also prescribed a custom pain gel which contains the following: 1) 10% Flurbiprofen, 2) 2% Cyclobenzaprine, 3) 3% Tramadol, 4)5% Lidocaine, and 2% Baclofen.

I hope this info helps.

Answered by Dr. Venkat Sivayogi (7 hours later)

Brief Answer:
possibly due to anti depressant drug...

Detailed Answer:
Hello,
welcome to Healthcare Magic,

So what you have encountered is known as false-positive reaction. Because of cross reactivity we do see these false positive results.

I suspect the culprit is Lexapro or antibiotic which you have used for treating MRSA infection.

Now iam outlining various possibilities of false-positives of cocaine :-

1. Any infection related to kidneys (UTI)
2. Penicillin related Antibiotics
3. Drugs used in depreesion and anxiety (non-opioid and non-benzodiazipines) like Lexapro

Hope i have clarified your doubt, if you have any further queries feel frr to contact again.

DR.VENKAT M.D

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