I have 2 kittens and 1 adult cat. Purchased Sergeant's flea treatment because the 2 kittens were infested and it affected my adult cat. Normally I would have gone to the vet but my car is out of commission. I treated my three cats and immediately one started acting real strange. Luckily none of them really got sick but three days later the flea problem continued. I decided to look up reviews on this product to see if it worked as described to find out that many animals died and most got sick. I'm very thankful that this wasn't my situation and I will never attempt to use this product again. The reviews are simply horrible and I am in shock that this product is still available for sale. It's not worth the savings. Go to a veterinarian and get the right stuff. It's more effective and your beloved pet will be safe.