Frontline Original for cats is a topical 'spot-on' application for the treatment and prevention of flea infestation and biting lice on cats and kittens. It is also effective against all stages of the brown dog tick, the American dog tick, lone star tick and deer ticks (the major carrier of Lyme disease). Frontline Original has a rapid onset of action and kills re-infestations with newly acquired adult fleas for at least one month. Frontline Original also prevents the development of flea eggs, larvae and pupae produced by any adult fleas acquired for up to 6 weeks after treatment. Frontline Original treats and controls Flea Allergy Dermatitis in cats. It can be used on kittens from 8 weeks of age and is safe to use on breeding, pregnant or lactating animals. Frontline Original is waterfast from 24 hours after application.