Advantage 2 flea control for cats and kittens over 9 lbs 4 month supply For cats over 9 lbs. 4 month supply Kills 98 - 100 percent of fleas and their larvae within 12 hours Re-infesting fleas are killed within 2 hours Breaks the flea life cycle EPA Est. No. 11556-DEU-1. EPA Reg. No. 11556-152