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The Food and Drug Administration on Monday approved the first new treatment for Alzheimer’s disease in nearly two decades, a landmark decision that has been eagerly awaited by millions of Americans diagnosed with the condition but that will be hotly contested by some in the scientific community who doubt the drug’s effectiveness.

While other drugs treat symptoms of Alzheimer’s, the new medicine, called Aduhelm, is the first to attack what some believe is an underlying cause of the disease and slow cognitive decline, albeit marginally. It does so by eliminating clumps of a toxic protein believed to destroy neurons and cause dementia. Aduhelm is not a cure for Alzheimer’s, and it doesn’t reverse the disease’s progression.

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The drug — which just two years ago was declared a stunning failure — is now expected to generate billions of dollars in revenue for its maker, Biogen.

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