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Avonex for Multiple Sclerosis. Avonex, a formulation of interferon beta-1a, is an injectable medication from Biogen approved by the U.S. Food and Drug Administration (FDA) for patients with relapsing forms of multiple sclerosis (MS) who have had a first attack and show lesions on an MRI. Avonex injections help reduce the number of flare-ups and MS disease progression. How Avonex Works. Interferon beta-1a, the active ingredient in Avonex, is a protein found naturally in the body. It is a signaling molecule produced by cells and is used for communication.
Betaseron and Extavia are approved by the U.S. Food and Drug Administration (FDA) for the treatment of relapsing forms of MS to reduce the frequency of clinical exacerbations.Relapsing forms of MS include individuals with secondary-progressive MS who continue to experience relapses or acute attacks.etaseron and Extavia are approved by the U.S. Food and Drug Administration (FDA) for the treatment of relapsing forms of MS to reduce the frequency of clinical exacerbations.