CAPSTAR Blue FAST ACTING for Dogs & Cats 2-25 lbs. A single fast acting dose of Capstar (nitenpyram) should kill the 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. We recommend you follow up CAPSTAR treatment with a monthly flea control product such as PROGRAM, Frontline or Advantage. Then keep CAPSTAR on hand for the times when there is a visible flea re-infestation. For: Cats (4 weeks of age and older and 2 pounds of body weight or greater) Dogs (4 weeks of age and older and 2 pounds of body weight or greater) Benefits: Starts killing fleas within 30 minutes Unflavored tablet Safe for pregnant or nursing dogs and cats