Help keep your cat pest-free with the Capstar Flea Tablets for Cats. Each tablet contains an active ingredient called nitenpyram and helps eliminate fleas in cats and kittens weighing between 2 to 25 pounds. The fast-acting formula starts working within 30 minutes and has been proven to be more than 90% effective in eliminating adult fleas within just hours. That means less itchiness and discomfort for your companion, much faster?and without the mess and odors of a topical solution. Capstar can also help kill adult fleas that may cause flea allergy dermatitis, which often results in uncomfortable, itchy skin. Just give the tablet as directed, and let the formula do the rest. This medication is safe to give your cat once a day with or without his favorite food.