Capstar Cat Oral Flea Treatment starts working within 30 minutes and will kill 90% of adult fleas within 6 hours of ingestion.
If your pet gets re-infested with fleas, you can safely give another dose as often as once per day
Capstar lasts 24-48 hours so it is best used in conjunction with a monthly preventative such as Frontline, Advantage or Capshield.

Active Ingredient: Nitenpyram

Safe for cats 4 weeks of age or older.