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My kitten has fleas. Is it safe to reapply Advantage II after 2 weeks?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | unneutered

I recently found a kitten about 4 months old that was infested with fleas. I bought Advantage II for kittens. 1 dose did nothing to the fleas. Gave him a Capstar pill and another dose of Advantage 2 days later and he still still a lot of fleas. It's been 2 weeks, is it safe to try another dose of Advantage?

3 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on June 25th, 2018

Since it's been two weeks since you late applied the Advantage, you can try another dose of it. He can also have Capstar again. Be sure to disinfect your home, as that will be a continuing source of fleas. Wash his bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. Best of luck, I hope this helps!

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on December 19th, 2016

    After three weeks, it should be fine to go ahead and apply another spot-on treatment. I would recommend using Revolution or Advantage Multi, as most other topical flea medications are not very effective in my experience.

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    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on February 25th, 2017

    Poor girl. I would recommend a Capstar as this will rid all fled within 24 hrs and is the only safe thing that can be given along with a flea preventative. Then I would consider switching flea products to something more effective, such as Revolution topical flea preventative. With many flea products, they can be re-dosed safely in 2-3 weeks. Call the manufacturer of the flea product you used initially just to verify that it is safe to redose early, if needed. And lastly don't forget to treat the environment with a flea fogger, available at your local hardware store or Lowes or Home Depot. I wish your kitty well and I hope you get a handle on this flea problem soon!

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    2Pet Parents found this answer helpful

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