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Avonex Pen is used to inject Avonex. The active ingredient in Avonex is a protein called interferon beta-1a. Interferons are natural substances made in the body to help protect from infections and diseases. The protein in Avonex is made up of exactly the same ingredients as interferon beta that is found in the human body.
Excipients/Inactive Ingredients: Sodium acetate, trihydrate; acetic acid glacial, arginine hydrochloride, polysorbate 20 and water for injections.
