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Biogen and Eisai change agreements on Alzheimer's drug

An amendment to Biogen and Eisai’s partnership deal means the latter will start receiving royalties from Aduhelm sales next year. The companies have also decided to extend collaborations on a new Alzheimer’s treatment.

Photo: BRIAN SNYDER/REUTERS / X90051

Going forward, Biogen and Eisai won’t be splitting global profits of Alzheimer’s drug Aduhelm (aducanumab), which is marketed in the US under the brand name Aduhelm, the companies announce in separate press releases.

Rather, Eisai will begin receiving tiered royalties based on net sales of the drug, which will take effect Jan. 1, 2023.

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