FRONTLINE Gold has a new triple action formula. Its 3 secret weapons: fipronil and (S)methoprene and pyriproxyfen make it relentless at killing fleas, flea eggs larvae, as well as ticks. And the protection doesn't quit all month. Regular use of FRONTLINE Gold helps prevent new flea infestations. EFFECTIVE: Kills adult Fleas, flea larvae, flea egg and 4 species of ticks FAST: FRONTLINE Gold for Dogs starts killing fleas in just 30 minutes on dogs LASTS: FRONTLINE Gold maintains efficacy through day 30 EXCLUSIVE: Sold exclusively to veterinarians TRUSTED: The FRONTLINE brand name is unparalleled in flea and tick control brand recognition