We have used that before. When we had our cat, she'd be on Zeniquin, every day. It was in an attempt to keep her kidneys from deteriorating worse than they already were. But when they're on antibiotics for long periods it increases the risk of picking up other infections, since the body's immune system is being compromised. About every 3-4 months she would get a UTI or bladder infection, and we have to switch to Clavacillin, or just Amoxycillian, but neither of those would target her kidneys and the disease. So we'd lose ground and her kidneys would get worse. Best we could do was make sure she had a good quality of life. And right up until the last 2-3 days, she did. We probably did more for her than most would. But at only two years of age when diagnosed we felt she never got a chance to live a good life, so we provided that. We still feel that she never really got a chance.
Just glad we have her brother to help keep her in our daily thoughts.