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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?

1 Answer

Most Helpful Answer

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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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