Contains 50% Permethrin & 1.2% Pyriproxyfen (Nylar). Once-a-month spot-on treatment for dogs and puppies over 12 wks of age. Kills, repels & prevents re-infestation of fleas for up to 5 wks & ticks up to 6 wks. Kills or repels mosquitoes, lice and mites on dogs for up to 4 wks. Breaks the flea life cycle.
* Same active ingredient as BioSpot Flea & Tick Control and Adams Spot-on Flea & Tick Control You may read more about careful use of spot on treatments Here