23% off (Sale price $39.82, Reg. Price $51.77) :: Activyl contains a lethal active ingredient, Indoxacarb, which works by using a method called bioactivation in which Indoxacarb is activated using the flea’s own enzymes. When a flea attacks your pet, it absorbs the active ingredient, which causes the enzymes within the flea’s gut to change. The flea becomes too weak to feed due to paralyzing effect of Activyl and dies.
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