My one and only experience with it was bad but from what I've heard that is rare. When we first got Scout I took her to the vet for a checkup. She had some earmites and a few fleas so the vet decided to give her one dose of Revolution to treat it all. The vet tech applied it pretty much to just one big spot on her back, she didn't spread it out with smaller drops. About a week later Scout's fur fell out at the spot she was treated and she had bumps on her skin. I took her back to the vet and the thought Ringworm so they did a culture. It came back negative for Ringworm but by that time her skin looked very burned. After $100+ in vet bills we all finally decided that it was the Revolution that did it. I'll never use it again on any of my pets but the vet swears that this is the first time that has ever happened that they know of.

Sometimes I feel like I'm always the exception to any case.