An easy to apply monthly spot-on treatment, Revolution kills adult fleas as well as their eggs and larvae, breaking the flea lifecycle. This 6 in 1 product also protects your cat from heartworm disease. Revolution treats and controls ear mites, biting lice and kills roundworm and hookworm. Safe for treatment of kittens from 6 weeks of age, and safe for use in pregnant and lactating queens. Waterproof after 2 hours in cats. Safe for use in rabbits over 8 weeks of age. Available for all sizes in a 3 or a 6 pack.