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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.
Avonex is the brand name of the injectable medicine interferon beta-1a, which is used to treat symptoms of relapsing multiple sclerosis (MS).Interferon beta-1a is also manufactured under the brand name Rebif. MS is a neurological condition where the immune system attacks the protective covering of nerves.Relapsing MS occurs when symptoms come and go. Avonex is in a class of drugs known as immunomodulators, which work by acting on the immune system.nterferon beta-1a is also manufactured under the brand name Rebif. MS is a neurological condition where the immune system attacks the protective covering of nerves. Relapsing MS occurs when symptoms come and go. Avonex is in a class of drugs known as immunomodulators, which work by acting on the immune system.