Capstar Flea Tablets Oral Treatment for Dogs 2-25 lb 6 Doses Fast ActingCapstar (nitenpyram) flea tablets for dogs 225 lbs are a fast acting oral flea treatment that starts killing adult fleas in 30 minutes. A single dose kills 90% of adult fleas within 4 hours for dogs. Can be given as often as once per day to help eliminate flea infestations. For puppies 4 weeks+. Key Bullet Points: Fast acting oral flea treatment tablets for small dogs (225 lb) Starts killing fleas in 30 minutes Kills 90% of adult fleas within 4 hours