Protecting you and your pet from fleas 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 Clean CAPSTAR is an orally administered tablet. So there’s no odor or messy application on your pet or in your home. Plus, oral tablet formulations provide protection that can’t rub or wash off. CAPSTAR is Safe CAPSTAR is safe for puppies and kittens four weeks and older, weighing two pounds or greater, as well as for pregnant or nursing dogs and cats. You can safely give a dose of CAPSTAR as often as once per day. CAPSTAR is Effective CAPSTAR starts working within 30 minutes.