On February 24, after a long day at work, I got home and found my Maine Coon and German Shorthair had fleas. Mistakenly I had grabbed the wrong flea stop(Hartz One Stop) instead of a safe presription Advantage and put it on my cat. By the next morning she was disoriented, twitching, and shaking. I came home from work, and immediatly gave her a bath, and called the Vet. I was told to bring her in immediatly and she was put on IV medication, and given medication to calm down the shaking. I picked her up 6 hours later. Today she is still twitching, has trouble with balance, and is clearing not feeling well. I found this website, and got the number to call Hartz about what long term effects this would cause my cat. I was transfered to customer relations, put on hold, and told they have no information on any long term effects. When I requested to speak to someone more knowledgable, she hung up on me. That’s their customer service. I feel terrible what I have done to my cat, and believe this product should be taken off the market.