Cheristin for Cats (Spinetoram) is a topical flea treatment designed specifically for cats. While monthly application is recommended, Cheristin's long lasting formula protects against fleas through 6 weeks 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.