What is Biogen's biggest product?

Written by Editorial Team | Last Updated: August 2026

Biogen’s product portfolio includes several key therapies, particularly for multiple sclerosis and spinal muscular atrophy. Its primary treatments include dimethyl fumarate (Tecfidera), diroximel fumarate (Vumerity), interferon beta-1a (AVONEX), peginterferon beta-1a (Plegridy), and natalizumab (Tysabri), which collectively accounted for 45% of the company's 2024 revenues. Additionally, the company markets nusinersen (Spinraza) for the treatment of spinal muscular atrophy. While these products represent the company's primary revenue drivers, specific rankings of "biggest" by volume or revenue often fluctuate based on quarterly financial reporting and market competition.

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