I was on Tysabri for well over a year...almost 2. I started on the tests before they even named it...it was just a number then. It put me into remission and kept me there until they pulled it from the market. The only real warning I have is to watch out.....you can gain a lot of weight....I jumped almost 100 lbs in just over a year. I have since lost it again...SO, I GUESS YOU COULD SAY:
On Tysabri I was sitting fat and happy.