Capstar is an efficient, single, fast-acting dose that kills adult fleas on your pet. If your pet gets re-infested with fleas, you can safely give another dose as often as once per day. To administer Capstar tablets, place the pill directly in your pet's mouth, or hide it in food. If you choose to hide the tablet in food, watch closely to make sure your pet swallows the pill. If you are not sure that your pet swallowed the pill, it is safe to administer a second pill.