multiple sclerosis
"Avonex is good because it's once a week; the Pen makes it so much more convenient.  Unlike my experience with Copaxone and Rebif, I have very few (if any) site reactions.  I have used Avonex in all it's forms (powder you have to mix yourself, prefilled syringes, and now the Pen) and the Pen is the only one with almost NO flu-like side effects!  Love it!"