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How soon can I use topical flea treatment after my cat gets Capstar?

Updated on September 23rd, 2025

If I give my cat capstar how soon is it safe to start a longer-lasting topical flea treatment? Which topicals are safe to use - any, or just select brands?

2 Answers

Most Helpful Answer

Angel Alvarado, LVT

Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on January 13th, 2020

You can use Capstar concurrently or start a topical the next day. Capstar starts to work to kill adult fleas on your cat within 30 minutes. Within 6 hours all adult fleas on your cat should be dead or dying. It can be given daily if necessary.
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Related Answers from Veterinarians

  • Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on March 1st, 2017

    Because cats are so sensitive to flea medications, I would wait at least two weeks before treating Missy again. You can give her Capstar now, however. It's a one time pill that starts killing fleas in 30 minutes and is safe to give now. You can give it again as needed during these two weeks :-)

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    1Pet Parents found this answer helpful

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