### Human:\nwas prescribed 500mg ciprofloxacn then dr. prescribed 875 mg of amoxicillin after lab test for bladder infection. why?\n\n### Assistant: the culture (of your urine) likely revealed an organism that was not sensitive to the ciprofloxacin. this may be why there was a change in the antibiotic but you would need to talk to your doctor's office to confirm that this was the reason. another reason could be insurance coverage.