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The active ingredient is imidacloprid, which acts on the nervous system of the flea to cause paralysis and subsequent death. Within 12 hours of application, 98-100 percent of fleas are dead. Advantage kills fleas before they lay eggs, so their life cycle is broken at multiple stages. It also kills flea larvae within 20 minutes of contact. Cautions:

Individual sensitivities, while rare, may occur after using any pesticide product for pets. If signs persist, or become more severe, consult a veterinarian immediately

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16y ago

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