Advantage for dogs contains Imidacloprid. This active ingredient is a powerful insecticide. It starts killing fleas within an hour of application. It eliminates adult fleas and larvae in your dog's surroundings and thus prevents further re-infestation. This monthly treatment kills adult fleas within 12 hours of application and kills about 99% flea larvae found on dog and in its surroundings. It prevents several diseases caused due to fleabites and protects dogs from its harmful diseases. It reduces outbreaks of Flea Allergy Dermatitis and controls lice.