Flea and tick prevention 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. This month-long treatment is made for cats and kittens eight weeks or older, weighing 1.5 pounds and greater.