On october 22nd 2010 @ 12:30 am, I had put hartz cat flea medication on my two cats. I woke up @ 530 am on october 23rd to one of my cats having a severe seizure, something it’s never had before. I called the emergency vet to see what had caused something so terrible to happen…I explained to the vet that I put the medication around his neck, he then told me that the toxins could have entered his body, and is now causing him to have seizures. I waited for about 45 minutes before I took him to the er vet. He was twitching, and having tremors. His body was very stiff… he was unable to walk without falling on his face. He was salivating tremendously, then eventually threw up. I brought him to the er vet because my vet was not open that early. When I got there he started to have ANOTHER severe seizure. They took him to the back right away, I had to pay 539.00 upfront for my cat to be treated which I then did. I went home around 9 am, when I received a phone call from my mother explaining that my OTHER cat was now having the same twitching happening with him. I rushed home to find my cat twitching ridiculously, I called the er vet once again. The vet told me to bring him in right away. I brought him there, they took him right to the back. I had to pay 319.00 to have this poor cat taken care of, in total 858.00. Today ( October 24th) I was able to bring both of my cats home. The one with the less severe symptoms is now walking around the house fine. The other one is lifeless, It was explained to me that he could be like this for a few days or could possibly be like this the rest of his life… He won’t open his eyes, and he’s constantly jumping up as if someone is startling him. This product is definitely legal poison, I’m not sure how something so terrible could be even ALLOWED to be sold. I tried to contact the company, but cannot find a number to contact them at. I will NEVER use this product ever again. I was told by the vet to use Frontline, but now i’m so scared to even give them flea medications again.