Frontline Combo Cat removes fleas, ticks and biting lice in cats. The drops have a dual function. It stops the development of flea eggs around your cat. The same goes for flea larvae and the development of pupae. If your cat has been treated with Frontline Combo Cat, your cat is still protected against fleas finding their way to your cat within 24 hours. The drops of Frontline Combo Cat are also suitable for ferrets.