Vetality Avantect II Medium Dog 11-20 LB 4-Dose for Dogs contains imidacloprid, permethrin, and pyriproxyfen the active ingredients found in K9 Advantix II for dogs. Vetality Avantect II is vet quality protection but costs less than the national brand. These broad-spectrum topicals not only KILL but REPEL fleas, flea eggs, ticks & mosquitoes. Avantect II also kills ALL stages of fleas, repels biting flies, and kills lice. Available in four convenient weight breaks and a four-month supply for continued protection. Do not use Vetality Avantect II on cats.