Does Bactrim Cause False Positive For Benzodiazepine In A Urine Drug Test?

Posted on Wed, 21 Dec 2016

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Wed, 21 Dec 2016 Answered on

Sat, 7 Jan 2017 Last reviewed on

Question : Can the use of bactrim for HIV cause a false positive for a drug benzodiazepines? A dipstick test indicated faint indication. But urine when ran completely show negative. Yet the doctor said he was not a lab tech and could not verify this question. Should I contact the lab. This is for my son, who is a 40 year old male.

Answered by Dr. Alexander H. Sheppe (3 hours later)

Brief Answer:
Consultation

Detailed Answer:
Hello, and thanks for your question.

Bactrim should not result in a false positive for benzodiazepines. This was likely lab error. I would call the lab and have the sample re-tested.

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Above answer was peer-reviewed by : Dr. Arnab Banerjee