CAPSTAR (nitenpyram) is a fast-acting, oral flea treatment for dogs four weeks and older who weighing at least 2 pounds that kills adult fleas before they can start an infestation. Starts killing fleas within 30 minutes to give your pet quick relief. One oral tablet kills over 90% of fleas within 4 hours for dogs. It can be used daily, as needed, to help treat and control existing flea infestation. Monthly flea prevention is recommended for long-term flea prevention. 6 Tablets