Petco Text Logo
Petco Pet Logo

How quickly do Advantage flea treatment side effects appear in cats?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 6 years and 9 months old

I bought advantage for all my cats, but I am worried about the side effects. How long I have to wait to notice side effects if there appear after the application (if I apply it correctly of course, and if they don't lick it)?

1 Answer

Most Helpful Answer

Image profile

Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on February 24th, 2018

Usually in the first 1-4 hours after application. If you give the right dosage you should not notice any side effects. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored