I found the side effects were getting worse and worse after 8 weeks. I also had signs of hypothyroid: Temp 96.2, feeling of heat, but skin cold and dry to touch, enlarged tongue, weight gain, hair loss. And that awful achy feeling - 24/7, 7 days a week.
I tried to call the people at Avonex, but could not get through. I tried 7 times to find what to do for all this. NSAIDS stopped helping and I was taking so much, it was bound to damage my stomach.
So, I took myself off and now have 4 months of Avonex in my fridge.
Has anyone else had thyroid problems from Avonex? I read it is one of the effects.