Kills adult fleas quickly - within 30 minutes! FDA approved. Directions: One dose given orally, should kill the adult fleas on your pet. If your pet gets re-infested, you can safely give another dose as often as once a day. Safe for nursing or pregnant dogs and cats. Treat all infested pets in the household. It is also safe to use in dogs, puppies, cats and kittens over 4 weeks of age and weighing over 2 pounds. Active Ingredients: 11.4/57 mg of nitenpyram Warning: Keep out of reach of children.