Advantage orange for cats 5-9 lbs WE SELL ONLY THE LEGAL, EPA APPROVED ADVANTAGE.4 and 6 Month Supply. SAY GOOD-BYE TO FLEAS! Kills 98% - 100% of fleas within 24 hours. Each card of Advantage flea control contains 6 ampules, and one ampule will last up to 4 weeks. Simply cut tube open, squeeze contents between pet's shoulder blades, and relax. Advantage flea control spreads naturally with the help of the pet's natural movement - providing immediate relief from fleas. Can withstand a shampooing between treatments.Bayer