Amazon Basics Flea & Tick Topical for Cats, 6-Dose Supply — Fast-Acting and Waterproof. SOLD OUT ONLINE ON AMAZON.Com This topical treatment kills fleas, flea eggs, flea larvae, ticks, and chewing lice. It is designed for cats and kittens 8 weeks or older weighing over 1.5 lbs. Compare to the active ingredients in Frontline Plus for Cats. Key Features: - 6 monthly applications included (box corrected from user title). - Fast-acting, long-lasting, and waterproof formula. - Easy topical application between the shoulder blades. - Contains Fipronil (9.80%) and (S)-methoprene (11.80%). Condition: New in original retail box. Sealed.