Frontline Spot on Cat is for the prevention of infestations by Fleas and Ticks in cats, and is part of a treatment strategy for Flea Allergy Dermatitis in cats where this has been previously diagnosed by a Veterinary Surgeon. Frontline Spot On Cat controls infestations with biting lice on cats. It is effective against fleas for up to 5 weeks and ticks for up to 1month in cats. It also controls lice within 48 hours. Routine treatment is advised to prevent flea infestations.Frontline Spot On Cat can be used in kittens from 8 weeks of age and weighing at least 1kg. More vets are choosing Frontline than any other flea treatment. They trust Frontline products to kill parasites fast and to go on protecting your pet.