WashU Medicine May 12 2025 The Food and Drug Administration's approval in 2023 of lecanemab - a novel Alzheimer's therapy shown in clinical trials to modestly slow disease progression - was met with enthusiasm by many in the field as it represented the first medication of its kind able to influence the disease. But side effects - brain swelling and bleeding - emerged during clinical trials that have left some patients and physicians hesitant about the treatment. Medications can have somewhat