Updated On September 23rd, 2025
Pet's info: Cat | American Shorthair | Male | neutered
Clavaseptin for cats with UTI (urinary tract infection): how long does it take for it to work?
1 Answer
Published on December 15th, 2015
Clavaseptin (called Clavamox on the U.S. market) usually starts to work pretty quickly. I would expect you to see improvement in 12 - 24 hours after starting it. If you're not seeing improvement two things could be going on: 1.) your cat doesn't have a UTI, and there's something else causing his problems or 2.) the bacteria causing your cat's UTI isn't susceptible to Clavaseptin, and that antibiotic isn't effectively treating the infection. You didn't mention your cat's age but I'll throw in that UTI's are actually extremely uncommon in cats under 8 years of age. Mostly they have a syndrome called feline lower urinary tract disease, often abbreviated FLUTD or FUS. In male cats it can be extremely serious as the inflammation can cause blockage of the urethra and the inability to urinate. If you're seeing anything like this in your cat I'd urge you to seek veterinary care immediately.
45Pet Parents found this answer helpful
Book an appointment with the pros – our expert vets are here to help.