Bests & Worsts Reviews from Amazon

Firstly, I'm a former vet tech and I can tell you that if you are having a really severe, active flea infestation, this probably isn't the best option for you. You're better off getting a name brand, prescription product for your cats (Revolution, Bravecto or Comfortis are all good) and doing a multistep approach of house treatments, flea baths, and meds. Frontline was one of the first products to be introduced to the market and fleas have been exposed to it more than most other products, meaning they have built up a tolerance. Flea meds effectiveness varies depending on the area you live. This product is basically a generic of Frontline (same active ingredient). If Frontline doesn't work for you, this product won't either. I've been using this on my indoor only cats as a preventative and so far it works great! I have two indoor cats and two indoor/outdoor dogs. One of my cats has a really severe flea allergy that will land her at the vet if she gets bit by even one flea. Using prescription meds on my dogs and over the counter stuff on my cats (who are less likely to encounter fleas) seems to be the trick. This is priced MUCH lower than Frontline (which runs about 4X as much as the Sentry brand generic), which is awesome. It's also packaged nicely and seems to be more concentrated than Frontline so I don't' end up dumping a bunch of liquid on my cats, who aren't excited about flea med time anyway.