I have found that Advocate is the only effective flea treatment for my five cats. They were riddled with fleas despite using Frontline regularly as directed and spraying the house and hoovering madly. My vet suggested Advocate when I described my problems and there was not a flea in sight after only 2 days. They've been flea free ever since and it seems to last a good 6 weeks between treatments. Love it. Couldn't recommend it more.

I just get it from my vet. About to go and buy some now and see how much it costs as I can't remember!