Cheristin® for cats is a flea treatment and prevention specifically formulated for cats. Cheristin’s long-lasting formula protects against fleas through 6 weeks1 and is applied using a twist-and-use applicator for comfortable, easy application. Cheristin comes in one dose size for all cats and kittens (1.8 lbs or greater and 8 weeks of age or older), making it great for families with multiple cats.