Four of the seven currently available disease-modifying MS drugs are often referred to as “the interferons” - Avonex, Rebif, Betaseron, and Extavia. The first two listed are interferon beta-1a and the last two are interferon beta-1b.
What is an interferon?
Occurring naturally in the body, interferons are glycoproteins which are secreted by immune cells in response to viral infections. It is believed that they provide protection to other cells against the viral infection. In...

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