Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
By side effects, do you mean on the kidneys or in general?
Both, She has had a small mumber of castings in her urine 2 times, can the medication or the food lead to this?
Ok - good.
No - this is a diet which can be a long term maintenance diet based on the urinary tract disease.
We do not expect long term illness from this.
Secondly, yes - uroeze can be used at the same time.