Revolution is a preventative medication that is commonly used for flea control and is not a pesticide. Revolution is also a broad-spectrum medication that is used to protect your pet against most internal and external parasites. The primary use of Revolution is for flea control. By killing both the adults and eggs of the flea their life cycle is stopped and ridding your pet of the fleas quickly. Revolution is fast, simple and easy to use and comes in a low-volume dosage sizes so the solution can be applied in one spot. Revolution can also be used for the prevention of heartworm. When Revolution is replacing another medication used for the prevention of heartworms the first doses of Revolution must be given within a month of the last dose of the former medication.