Provecta II for Cats from Neogen is a once-a-month topical flea prevention and treatment specifically formulated for the feline family. Provecta II kills adult fleas, and flea eggs and larvae, which prevents reinfestation. Within 12 hours of application, fleas are eliminated, and your cat can remain flea-free for up to one month after use. Contains imidacloprid and the insect-growth regulator, pyriproxyfen. Provecta II is fragrance-free and safe to use on cats and kittens at least 8 weeks of age or older.