Deliver total flea protection to your cat or kitten with Advantage II Large Cat. This vet-recommended . topical treatment and prevention formula kills adult fleas . flea larvae . and flea eggs on contact within 12 hours of application – meaning fleas can be eliminated before they bite or lay new eggs. Effectively break the flea life cycle . control existing flea and lice infestations . and prevent further infestations with one simple application. Advantage II Large Cat flea protection is effective on both indoor and outdoor cats. Your cat should be at least 8 weeks old and weigh over 9 lbs. to use Advantage II Large Cat.