Well I have tried Advantage,Frontline and a couple more supposidly flea killers. None worked well for me. I have found that giving my cat one capsule of Nitenpyram-same as capstar once a week works better than the aforementioned products. I know you are told even by the vets that you have to use it every day but that is not the case.. It is a heck of a lot cheaper than Capstar and has the same ingredients. I buy mine off Ebay. http://www.ebay.com/sch/i.html?_trks...pyram&_sacat=0