3 unanswered questions about the newly approved Alzheimer’s drug Leqembi

Experts say questions about its safety and effectiveness remain.

FILE - This Oct. 7, 2003 file photo shows a closeup of a human brain affected by Alzheimer's disease, on display at the Museum of Neuroanatomy at the University at Buffalo in Buffalo, N.Y. On Friday, Jan. 6, 2023, U.S. health officials approved Leqembi, a new Alzheimers drug that modestly slows the brain-robbing disease. The Food and Drug Administration granted the approval Friday for patients in the early stages of Alzheimer's. (AP Photo/David Duprey) (David Duprey, AP2003)

A new Alzheimer’s drug was granted full approval by the Food and Drug Administration on Thursday, marking the first time the agency has approved a drug meant to slow the progression of the disease.

The drug, called Leqembi, was shown in clinical trials to slow the progression of Alzheimer’s disease in people with mild cognitive impairment or early-stage illness. It is not a cure.

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Leqembi targets a type of protein in the brain called beta-amyloid, long thought by scientists to be one of the leading causes of the disease.

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