How long do antibiotics take to work for my cat's breathing?

Question

How long do antibiotics take to work? My veterinarian couldn't tell if my cat had a respiratory infection or cancer. I don't want her suffering. Pet's info: Cat | American Shorthair | Female | spayed | 13 years and 1 month old

Dr. Melanie, BVSc MS · Accepted Answer

Thank you for posting more information on Vegas! I'm sorry your veterinarian wasn't able to tell you if her breathing problems were caused by a [respiratory infection](https://www.petcoach.co/article/5-things-you-should-know-about-feline-respiratory-infections) or [cancer](https://www.petcoach.co/cat/condition/cancer). A [second opinion](https://www.petcoach.co/article/when-is-it-time-to-seek-a-second-veterinary-opinion) with a different veterinarian, veterinary oncologist or an internal medicine specialist may provide a more definitive diagnosis. That said, with antibiotics, you should start to see some relief from symptoms as early as 24 hours after starting treatment, and should see significant improvement within 72 hours. If you aren't seeing any improvement in Vegas's symptoms after 3-4 days of taking antibiotics, then I would be more inclined to think her symptoms are related to cancer. I hope the antibiotics do help her :-)

How long do antibiotics take to work for my cat's breathing?

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