With my review i am going to address points from reviews posted. This review is only based on my personal experiences.
1. Price. Yes, this product is expensive. However, it's absolutely worth it. It works very well and I've always felt that my cats not suffering is more important than the price tag. Also, here on amazon is significantly cheaper than other places. (Saved $20 buying it here instead of 1800petmeds)
2. Balding. There are a few things that need to be known for this product. Make sure you are using the appropriate dose for your cats. Weigh them. Do not assume their weight. If they are on the borderline, use the smaller dose or dont use all of the larger one. Also dont put it all in one spot. Make a line from the back of their neck to their shoulder blades.
3. "Frontline is cheaper and does the same thing". Incorrect! Frontline is cheaper but in order for frontline to work, the fleas have to bite the animals. This product does not require them to be bitten.
4. "Fleas didnt go away." You cannot expect any flea product to completely rid your home of them. It takes a minimum of 3 months to completely get rid of them if you actively fight against the fleas. You need to vacuum your floors and furniture every day at least for awhile. You also need to keep up with your laundry and wash blankets regularly, including your bedding. And its also very important to be spraying your furniture down with flea spray. RAID or Hotshot work wonders for this! Spray your furniture and bedding down every night. I also spray in the crevices of my apartment because fleas like to hide.
5. "Fleas were going everywhere so i had to give them a flea bath." Do NOT do this. Them jumping off your pets is a GOOD thing! That means the product is working. If you bathe them before the product has time to set it, you just wasted your money. This is why you need to be keeping up with prevention in your home. Theyre jumping off your animal because the product is working. Vacuuming, washing, and spraying is what will combat the infestation.

You CANNOT get rid of fleas completely in a short period of time so dont expect a miracle. That's where people get disappointed. Let the product do its job and play catch up for the next few months. And make sure you're keeping up with the doses!!

I've been putting these on my large cat now for a few months and they do work at killing fleas but they don't last long , within about 5-7 days the cat is scratching again and I'm getting bit occasionally by fleas also. My cat is a inside cat so I would hate to see results if he was actually going outside day to day. I have read some horror stories about these drops harming their cat but I haven't seen any of that on my cat. His skin seems fine around the area I applied the drops . I plan on just going to get the good stuff from the vet in the future .I give up on finding good or equivalent flea drops over the counter outside the vets office . Guess vets gotta eat 2.

I have had a flea problem in my house for months after bringing in a stray and wanted to get something to help the cat while I treat my home. I had tried Frontline and it did nothing at all. One month later I applied Advantage and have not seen more than one flea on her instead of dozens despite the fact that I'm still treating the house. She's still scratching around her face, but I think she's scratching old bites and I can't expect her to have none due to the state of the house, so overall I'm very impressed. She's even obsessed with sleeping in the box it came in. I recommend this a thousand times over Frontline!

I used Advantage II for the first time on my cat and within hours the fur on the back of her neck fell out. It's been 3 days and she has a bloody, bald patch of skin. I've taken her to the vet twice now and spent over $600 trying to help with the pain and discomfort. She has never had this type of reaction to the previous formula. I feel awful for putting this on her, and after seeing other reviews I realize this has happened to other users. Unfortunately this product is non-returnable so it was an expensive mistake and an awful experience for my cat.

DO NOT BUY THIS MEDICATION, ADVANTAGE II LARGE CAT( I would suggest ALL sizes!):Your Cat's hair will fall out, your Cat will scratch INCESANTLY until he/she develop's open lesions, that are not able to heal enough to go away because of the intense itching!! There is a huge burn patch where the med's were administered, and all the fur around the site (NOW, the size of a half dollar) has fallen out!? I AM SO FURIOUS AT THIS EFFING COMPANY, AND SO SAD for my poor Cat, Coal, who has to endure this bulls***, until the med's wear off, hopefully??? Oh, did I mention that my cat didn't even have ANY fleas?? This was a preventative measure, made worse!

Skeptical? See for yourself? PLEASE!!!!! Spare your furry family members from this TORTURE!!!!