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. Its long-lasting formula is stored in the oil glands of the pets skin to give non-stop flea and tick protection for a full 30 days. Provides fast-acting, long-lasting treatment and control. Approved for use on cats and kittens 8 weeks or older, 1.5 lbs. and over. Kills adult fleas plus flea eggs and larvae to stop existing infestations and prevent establishment of new infestations. Kills ticks. Trusted by veterinarians for nearly 20 years. Works non-stop for a full 30 days. 3-dose supply lasts for 3 months