cost of avonex im
Avonex cost per month. Common Questions and Answers about Avonex cost per month. avonex. When I was on Rebif, it cost me $40 a month, although the cost billed to my insurance was about $2100 a month. My Tysabri is also costing me $40 a month, because they are putting it under prescription fees vs medical treatment fees. I then also pay $7 a month so far, as my copayment for the infusion itself.