Kills fleas, flea eggs, ticks, & chewing lice. Kills ticks, including those that may transmit Lyme Disease. Fast acting. Long lasting. For use only on dogs 23-44 lbs over 8 weeks of age. Contains fipronil, an active ingredient used in Frontline brand products (PetArmor Plus IGR for Dogs is not manufactured by or distributed by Merial. Frontline is a registered trademark of Merial). Breaks the flea life cycle. Questions? Comments? 1-888-908-TICK (8425). Or write to: Sergeant's Pet Care Products, Inc., PO Box 540399, Omaha, NE 68154-0399.