"Tysabri helped reduce symptoms"
Where did you read this? It is my understanding that none
of the MS drugs do this. They appear to all be designed to reduce future flareups and possibly their severity, but should have no effect on any symptoms you may currently have.
From the TYSABRI website:
There are 3 ways TYSABRI can impact relapsing MS:
Reduces the number of flare-ups per year
Slows physical disability progression
Impacts the number of new brain lesions and existing lesion activity
You can get all their info here:http://www.tysabri.com/about/choosing-tysabri