Etofenprox is an actual insecticide that is in the pyrethroid class of insecticides. The product spreads the oils in the animals cost and as a flea bites they receive a lethal dose of the Etofenprox and usually die within 24 hours.
Please see our Pet Flea control page. Specifically, we recommend to use the Martins Prefurred Plus for Cats. Prefurred Plus for Cats contains the same active as the popular Frontline Plus for Cats.