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Hi. Welcome to Just Answer. My name is***** How long ago was this antibiotic prescribed? How long of a course was she on of it? When was her last dose? When on it she returned to normal?
Thank you for all that good information. In a situation like this, considerations have to be for the following. A residual urinary tract infection that never was cleared. This would have to be a high suspicion with the clinical signs improving while on the antibiotics. It may have just not been cleared with that course. It may be a situation where a different antibiotic is needed or maybe a longer course. The best thing to do here is to have her seen again and a urine sample evaluated to see if an infection is there. Sometimes a urine culture is needed to determine the best antibiotic. Sometimes an X-ray is good to rule out bladder stones that can present with recurring infections in the bladder. The other consideration is one called sterile cystitis or FUS. This can present exactly like this. Here is a very good link on it that explains it best
The best thing to do as the next step is that urine evaluation.
The sterile cystitis isn't a deadly disease. It for the most part in female cats is an inconvenience. They have intermittent events of bloody urine and straining to go. Male cats potentially are more serious as they can become blocked in their irinary tract far more easily than females. In my career I've seen around 400 blocked males and 3 blocked female cats. Females just don't get blocked easily. The sterile cystitis cats can live a very long and happy life. The recent change of food could set things off. We still don't know why it happens. Stress is a big thought for it. There is no perfect diet. I recommend feeding what is easily obtained, affordable, what they like to eat and what they do the best on. It varies from cat to cat. I like the big names like Hill's, Eukanuba, Iam's, and Purina.
Intake of more water is a good idea in the sterile cystitis situations. More water bowls around the house can help with this. Also a fresh water recirculator can help encourage more drinking. Some do like the wet foods, but the draw back Is typically quicker dental tartar issues. I personally have my cats on all dry food.