Revolution for Cats is a monthly topical solution to control fleas, flea eggs, heartworms, ear mites, roundworms and hookworms in cats. Revolution for Cats kills adult fleas, prevents flea eggs from hatching for one month and is indicated for the prevention and control of flea infestations, for the prevention of heartworm disease, for treatment and control of ear mite infestations, for treatment and control of roundworm and intestinal hookworm infections. Revolution for Cats contains selamectin. Apply topically once per month. Approved for use in cats 8 weeks of age and older. Selamectin.