I take trazodone, neurontin, cymbalta, mobic, (meloxicam) robaxin, and im on an antibiotic. i tested + for benzos. can these cause a false +?

Not likely,: Unless it was a screening test only without confirmation by gas chromatogrophy and mass spectometry which is specific for the molecular structure of benzodiazepines. If confirmed by gc/mass spec then you must have ingested a benzodiazepine.

No,: The list of the medications that you provided has nothing to do with benzodiazepines. I think something is missing on your list to produce a positive benzos result. Check your medication again. Some of the medication listed might produce selective short term amnesia.

See below: If the test in question was a instant "point-of-care" test, one has to expect falsely positive results.