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How long until my cat's allergies improve on a prescription diet?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | unneutered | 1 year and 1 month old | 11.6 lbs

My cats been on a novel prescription diet for his allergies. About how long should it be before I start to see improvement in his overall health since he's no longer on the food he was allergic too?

1 Answer

Most Helpful Answer

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Answered By Mirissa Duncil, DVM

Veterinarian

Published on July 7th, 2017

Hi there! Our diet trials for patients with allergies can take a couple of months to show true improvement but usually around the one month mark the difference is noticeable. Make sure you are strictly following the diet trial and giving no other treats or food mixed in, as this will not give accurate results to your new food. Hope this helps!

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