How does Revolution work?

Revolution works by penetrating the skin and entering your pet’s bloodstream. Concentrations of selamectin, the active ingredient, in the tissue and bloodstream prevent heartworm disease. Selamectin also redistributes into the skin from the bloodstream and kills adult fleas, American dog ticks, and ear mites, and prevents flea eggs from hatching. It’s also an antihelminthic, which means it fights to expel parasitic worms. Parasites ingest the drug when they feed on the animal's blood.