New and improved K9 Advantix® II has a 5-way repel-and-kill pest protection. It not only kills ticks, fleas and mosquitos, it also repels them. It also kills lice and repels nasty biting flies. Using the proven power of IGR (Insect Growth Regulator), along with imidacloprid and permethrin, this topical treatment prevents flea eggs and immature forms from developing into adults and actively breaks the flea life cycle. Continues working even after bathing or swimming.