Cheristin for Cats is a topical flea treatment designed specifically for cats. Cheristin's long-lasting formula protects against fleas through 6 weeks1 and is applied using a rounded tip applicator for comfortable, easy application. Cheristin comes in one dose size for all cats and kittens (1.8 lbs and greater or 8 weeks of age and older), making it great for families with multiple cats. Cheristin is available without a prescription