To prevent and control flea infestations, Revolution should be applied monthly through the flea season, starting at least one month prior to when they become active. This will ensure that no viable flea eggs are produced to establish an infestation, that any flea larvae in the environment are killed, and the flea life cycle is broken. Monthly application will also assist in the improvement of Flea Allergy Dermatitis (FAD)in most animals. In some pets, veterinary intervention may be required if the clinical signs of FAD are not resolving. If there are any signs of hair loss, scabs or irritation on your pet due to fleas please seek veterinary attention as soon as possible.