Capstar Flea Tablets for Dogs over 25 lbs 6 Tablets Capstar (nitenpyram) is a fast-acting dog flea treatment tablet for use with dogs that starts killing fleas in only 30 minutes. A single dose of Capstar Oral Flea Treatment kills 90% of adult fleas within 4 hours for dogs. Give this oral flea treatment and watch the dead fleas fall off your pet. Capstar flea tablets are available for dogs and puppies over 25 pounds, and 4 weeks of age or older. Capstar starts killing fleas within 30 minutes. Achieves greater than 90% effectiveness against adult fleas within 4 hours. Treatment of flea infestations on dogs. Works from the inside out. For dogs over 25 lbs. Easy oral delivery means no mess and no rubbing off. For oral use. Keep out of reach of children. Active Ingredient: Nitenpyram