Revolution is a medication that is applied directly to your furry friend's skin to protect them from biting critters. When applied every 30 days, Revolution protects against heartworms and fleas. It may also be effective in preventing and treating ear mites, roundworms, and hookworms.**We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**