Protect your cat with the top name in flea and tick protection. Frontline Plus flea and tick prevention for cats and kittens is a long-lasting, fast-acting, and waterproof treatment proven to kill adult fleas, flea eggs, flea larvae, chewing lice, and ticks. This treatment kills ticks that may transmit Lyme disease. Frontline Plus for Cats has been trusted by pet owners for over 20 years. This month-long treatment is suitable for cats and kittens eight weeks or older, weighing more than 1.5 pounds. Made with two active ingredients, fipronil and (S)-methoprene, it breaks the flea life cycle by killing adult fleas, eggs, and larvae, preventing new infestations. One fast-acting topical application protects for a full 30 days. Data showing 20 years of trust in killing fleas and ticks is on file at Boehringer Ingelheim.