Good advice to follow the pills with a few milliliters of water. Any pills, but some can cause burning of the esophagus if they aren't washed down. I agree that the vet should have done a urine analysis before dispensing an antibiotic, but now you will need to wait until a week or so after the end of the course of antibiotics for a valuable culture. Not all vets do cultures routinely due to clients not wanting the expense and the difficulty getting an uncontaminated specimen. But at the very minimum a urinalysis needs to be done to check for the presence of crystals. If the problem recurs or doesn't clear up then an analysis of the crystals needs to be done, a culture needs to be done and an xray of the bladder to rule out stones. Actually, most episodes of lower urinary tract disease clear up with or without treatment, so some vets wait to see if it doesn't or if it recurs before going on to more expensive treatment. My personal thoughts are to put all cats, and definitely all cats with even one episode of urinary tract problems, on all canned food, to keep the urine more dilute and less likely to form crystals and stones. Also a canned diet is higher in meat and that leads to a naturally more acidic urine which will prevent struvite crystals, but not so acidic that calcium oxalate crystals are likely to form.