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My cat is itchy. How quickly does Zyrtec start working for relief?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 10 lbs

How soon will my cat feel relief when using zyrtec?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on November 30th, 2018

It should begin to work within a couple hours of administration. The half life allows for once daily dosing in cats. That said, not all antihistamines are effective in every cat. You must find the one that is most effective for your cat.

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