CAPSTAR® (nitenpyram) is an orally administered tablet that provides fast flea relief. In fact, CAPSTAR starts working within 30 minutes. A single dose of CAPSTAR should kill the adult fleas on your pet. If your pet get reinfested, it is safe to give another dose as often as once per day. You will literally see fleas falling off your pet. CAPSTAR is also remarkably safe. CAPSTAR is gentle on your pet. Capstar can be given to puppies and kittens four weeks and older, and may be used in pregnant and nursing bitches and in queens. Your pet can be treated anytime you see a flea, as often as once a day, and once it has done it's duty, CAPSTAR is completely eliminated from your pet's system within 24-48 hours.