I got an email for a Tysabri Webinar. I've been on for 5 years with no problems and I've seen a few people with questions. The Webinar may help as you can ask the meds them. It is Aug 12 at 7 pm for the live one and also has a few other upcoming dates. Hope this helps.

http://www.tysabriwebevents.com/?utm_source=mswebseries&utm_medium=redirect&utm_campaign=webeventsretention