Protect your cat with the number 1 name in flea and tick protection.(1) FRONTLINE Plus flea and tick control for cats and kittens is a long-lasting fast-acting waterproof flea and tick treatment proven to kill adult fleas flea eggs flea larvae chewing lice and ticks. This flea and tick treatment kills ticks that may transmit Lyme disease. FRONTLINE Plus for Cats has been trusted by pet owners for over 20 years.(2) This month-long treatment is made for cats eight weeks or older weighing 1.5 pounds and greater. Made with two active ingredients fipronil and (S)-methoprene this treatment breaks the flea life cycle by killing adult fleas as well as the eggs and larvae and prevents new infestations. One fast-acting topical application protects for a full 30 days. References: (1) BI Marketing Excellence Survey performed by Kynetec November 2023. (2) 20 years of trust in killing fleas and ticks demonstrated by various studies in the past 20 years including a 2002 Pet Owner Brand Awareness and Attitude Tracking Study performed by Bruno and Ridgway Research Associates and the 2023 BrandSpark© American Trust Study where FRONTLINE Brand Products were voted most trusted for brand for flea & tick prevention.