Metacam is given for cats with UTI's as it reduces the inflammation in the bladder - I have used Metacam with many senior cats and they have all been fine (and blood tests proved it), all drugs have side effects, but not all cats will go on to develop them. My vet doesnt' prescribe prescription food for urinary issues, just wet food only, less stress and we have something called Cystaid over here, which again helps the lining of the bladder - works wonders.