Carisa,

I have only used two MS medications: Avonex and Tysabri.

I used Avonex for over 6 years and was not sure if was working until I realized two things: (1) I had only two minor exacerbations in 6 years, and: 2) when I stopped for 5 weeks to switch to Tysabri, the syptoms from years ago all showed-up at once (i.e. Avonex must have been working).

Welcome to the site. I hope that we can help you through this process, s feel free to ask anything.

-Vic