How effective is interferon beta-1a (Avonex or Rebif) in the treatment of relapsing-remitting multiple sclerosis (MS) (RRMS)?

Updated: Oct 08, 2019
  • Author: Christopher Luzzio, MD; Chief Editor: Jasvinder Chawla, MD, MBA  more...
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In a study of 301 patients with relapsing-remitting disease who were given weekly intramuscular injections (6 million U [30 µg]) of interferon beta-1a (Avonex), the annual exacerbation rate decreased 29%. [89] Over 2 years, disease progression occurred in 21.9% of patients in the interferon beta-1a group and 34.9% of those in the placebo group. In addition, MRI data showed a decrease in the mean lesion volume and number of enhancing lesions in the interferon beta-1a group.

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