“It will give clinicians and patients a choice,” Petersen said.

An estimated 6.7 million people in the U.S. ages 65 and older were living with Alzheimer’s last year, according to the Alzheimer’s Association. The number is projected to increase to 13.8 million by 2060.

The agency’s approval was based on a late-stage clinical trial of 1,700 people that showed the drug slowed the progression of Alzheimer’s by about 35% after 18 months, compared to a placebo. Decline was measured using the clinical dementia rating scale, which focuses on how well patients performed in six categories: memory, orientation, judgment and problem solving, community affairs, home and hobbies, and personal care.

The results were similar to those seen with Leqembi.

Once patients’ amyloid has reached very low levels, Eli Lilly expects they would be allowed to stop taking the treatment, it has said. It is not yet known whether or when the amyloid might come back, but if it does, a patient would most likely need to restart the treatment.

Like other drugs in its class, Kisunla also comes with potentially life-threatening side effects, which include brain swelling and brain bleeding. Although most cases identified in the trial were mild, ​​three deaths were linked to the drug, according to the FDA.

Kisunla is the second Alzheimer’s drug of its kind approved, behind Leqembi. A third drug — Biogen’s Aduhelm — was taken off the market this year.

Medicare likely to cover treatment

Pat Bishara, 79, a mother of three from Carmel, Indiana, participated in both the phase 3 trial and the extension trial, which offered Kisunla to those initially given a placebo.

She was diagnosed with mild cognitive impairment in late 2017 and joined the trial in mid-2021.

Along with the monthly infusion, Bishara was also regularly evaluated by a psychologist. She had her final infusion June 6.

Bishara said she had no noticeable side effects during the trial. Although she sometimes has trouble remembering peoples’ names, she said, most people might not even realize she has the disease. She attributes that to the treatment.

“I feel in my heart I wouldn’t be doing as well as I’m doing if I wouldn’t have been on something,” Bishara said.

Lilly said Kisunla will cost $32,000 for a 12-month supply.

Medicare is expected to provide coverage for the drug. Last year, the Centers for Medicare and Medicaid Services said it will pay for new Alzheimer’s drugs that are granted full FDA approval, although it will require physicians to collect data about how well the drugs perform in the real world.

The FDA was initially set to decide about the treatment in March but delayed the decision to get more guidance from its advisory panel about whether the benefits outweighed the side effects.

Last month, the agency’s committee of outside experts unanimously recommended the drug’s approval.