PetArmor Plus For Cats 3 Month Application 2-count Contains the #1 vet-recommended active ingredient, fipronil and (s)-methoprene Waterproof formula that works for up to 30 days Easy-to-use, fast-acting topical application specifically formulated for cats Stops the flea life cycle and kills flea eggs and larvae for up to 12 weeks Kills adult fleas, flea eggs, flea larvae, ticks, including those that may transmit Lyme disease, chewing lice and prevents the development of flea pupae