“Hurray! After 3 months of Frontline failed to get rid of the fleas, applied Revolution 5 days ago. I'm still combing fleas (adult and pupae) off our cats....but they are all dead! Also, no flea poop, at all, so they appear to be climbing aboard then dying soon. Also, I don't see them scratching much anymore. So it's still too soon to tell for sure, but so far so good. BTW, our vet recommended Frontline initially, but after 3 months of trying, then some flea populations seem to have developed immunity Frontline, so suggested trying Revolution. Only complaint: Like all the flea meds, pricey...but it it continues to work, it's well worth the cost!”