Powerful Ingredients: CAPACTION flea tablets contain the same active ingredients as CAPSTAR (nitenpyram) Quick and Easy: This flea and tick pill kills fleas fast: begins working within 30 minutes. Proven Results: CAPACTION achieves greater than 90% effectiveness against adult fleas on cats within six hours. Easy-to-Use: CAPACTION is provided in a convenient oral tablet. No prescription needed. Intended Use: CAPACTION oral flea tablets are intended for use on cats weighing 2 to 25 pounds