I went to the vet today and spent $140.00 on meds for my 6 cats to get rid of their fleas. They gave me 6 Capstar pills...1 for each cat, and 6 month supply of Frontline...which is really a 1 month suppy for 6 cats. I got home and brought all the cats in. Gave them each a Capstar pill and put the Frontline on their necks. 30 mintues later my house was a mad house. The Capstar pill kills fleas in minutes but can take up to 6 hours to kill all the adult fleas. 2 of my cats were running all around, hollering, panting, breathing hard and doing laps around the house. I called the manufacturer of the pill I was so freaked out. They said that as the fleas die they wiggle around and cause the cats skin to get tickled. They called my cat's reaction to the pill the "Tickle Effect". It's crazy how that pill works. You can see the dead fleas just falling off the cat. It's really quite nasty. No more fleas!!!!