No matter what time of year or where you live, fleas are working overtime to infest your home and attack your cat. Vectra for Cats and Kittens is a monthly topical treatment that kills fleas at all (eggs, larvae, pupae and adults). Used monthly, you can take back your pet and your home from these pests. Customers that have not used Vectra with their pets before should get and use Vectra under the supervision of their veterinarian the first time.