Advantage is a monthly, spot-on treatment that protects your cat from fleas. Kills adult fleas and protects against re-infestation for a month, kills flea larvae and eggs, provides fast relief, stops fleas biting within 3 to 5 minutes of application.As well as killing adult fleas, Advantage kills flea eggs and larvae to break the flea life cycle and protect your cat from re-infestation for a whole month. It provides fast relief, stopping fleas from biting within 3 to 5 minutes of application and kills the adult fleas and larvae within 20 minutes.