Frontline or Advantage. Don't let it get any worse, it can kill the cat if the infestation is too great. Both treatments will kill the fleas within a matter of hours and prevent new fleas from biting, and kill the flea eggs as well. You can buy it at any pet store or vets office. Please don't wait any longer, your poor kitty is suffering already and in danger of anemia caused by the numerous flea bites.
