Cephalexin False Positive Drug Test

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I did a urine test to enter the military and it came back positive. I am not a drug user but I was on Cephalexin for a sinus infection a week or so before testing. I am perplexed??? Could the Cephalexin caused a false/positive test?

Thank you

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1

I am assuming they sent the urine to a lab for a GC/MS test or was it a rapid screening test? What drug did they say was positive?? It's possible that cephalexin could cause a false positive but if they did a GC/MS test it's not likely. When ever I get these questions I always ask if the donor was asked to sign a chain of custody form because it is possible they could have mixed up your specimen with some other person's at the lab. Did they seal the specimen container and did you have to put your initials on it?? If not ask for a retest and make sure they make you sign the seal that SHOULD go over the specimen container lid.

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2

I took a drug test at my probation officer and showed positive for benzos. I haven't taken anything other than buprenorphin and cephalexin and tylenol

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