Frontline Plus for Cats has been trusted by veterinarians for flea and tick control for kittens and cats for nearly 20 years. Made with 2 tough killing ingredients, fipronil and (S)-methoprene – one to kill adult fleas and ticks and the second to kill flea eggs and larvae – this fast-acting, long-lasting protection provides flea and tick control for cats and kittens 8 weeks and older, 1.5 lbs. and over.