I did not know that it is unusual to do Tysabri every 3 weeks. I never even knew it was an option until I was talking to one of the nurses at the infusion center, she suggested I try it to see if it helped me. I can't imagine they would do it if they could get in trouble... at least I hope not. So now I am curious if anyone else is having infusions every 3 weeks? I know some have to be out there because the nurse told me that it was more common for women and they had some people who were already on that schedule. Now I am wondering where they are...?