CAMBRIDGE, Mass.--(BUSINESS WIRE)--Biogen Idec Inc. (NASDAQ: BIIB) announced today that one-year data presented at the Academy of Managed Care Pharmacy’s (AMCP) 2007 Annual Meeting show that AVONEX® (Interferon beta-1a) is a cost-effective therapy in multiple sclerosis (MS) when compared to other interferon beta treatments. Using a comprehensive analysis of medical and pharmacy costs, the results of the research concluded that patients treated with AVONEX, the most prescribed MS therapy worldwide, have the lowest total one-year cost to a health plan when compared to other interferon beta treatments.