Advantage Flea Medication Purple 4-Month Supply. A once a month Topical Flea Treatment for Cats and Kittens 8 weeks and older and over 9 pounds. Kills 98-100 percent of fleas within 12 hours. Prevents reinfestation for at least 4 weeks. Convenient and easy to apply. Starts to kill adult fleas within an hour after application Stops biting fleas in three to five minutesWithin 12 hours 98-100 percent of fleas are dead

Advantage A9 Once a Month Tick and Flea Control for Cats 9 Pounds and UP - Purple