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I washed my kitten with dish soap. Is Revolution Plus flea medicine still effective?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 3.4 lbs

My new, 3-month old kitten came with a lot of fleas. I washed him with Dawn dish soap a week after applying Revolution Plus. Does the flea medicine no longer work because I washed him with dish soap?

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on August 22nd, 2023

Momiji is so cute! This is a great question. Because you washed him a week after applying the Revolution, it will still work. The medication will have been absorbed into his system. If he still has a lot of fleas, you can give him Capstar. It's an oral medication that starts killing fleas within 30 minutes, is safe to give once daily, and is safe to give with the Revolution. Keep in mind as well that fleas live in the home, not on the animal. They jump on to feed and then just off, so you will also have to disinfect the environment. 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. I hope this helps!

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