Advantage II Flea Treatment Large Cats Over 9 lbs -- 6 Tubes Starts working through contact Once-a-Month Topical Treatment for Fleas and Lice On Cats 8 Weeks and Older and Weighing Over 9 lbs 6 Pack (6-Month Supply) Waterproof  Kills Fleas  Kills Flea Eggs  Kills Flea Larvae