Smokey the Elder had a bad UTI. The vet gave her Clavamox, then Baytril. Neither worked. We persisted; it took SIX WEEKS of Tribrissen (very strong antibiotic) to knock it out. She had a resistant strain of bacteria. You might wish to ask your vet about prescribing a different type of antibiotic. Cats should start to respond within 48-72 hours with improvement. If they don't the bacteria are resistant.

Good luck! Hopefully your vet will let you work out the payments.

Luna, be good and take your pills.