Flea-Rid Adult Flea killer kills 100% of fleas taking a blood meal within 24 hours of dosing. Contains 12mg of nitenpyram per capsule. Give one dose per day until fleas are no longer seen on the host. 1 capsule for 2-25 pounds. For use only on dogs, puppies, cats and kittens 4 weeks of age or older and 2 pounds of weight or greater.