The US FDA approved an at-home starting dose for Eisai and Biogen's Alzheimer's drug. This new subcutaneous formulation allows patients to self-administer injections, improving access. Previously, patients received intravenous infusions, typically at clinics, for initial treatment. This approval differentiates Leqembi from competitor Kisunla's infusion-only requirement. The drug targets amyloid beta plaques in the brains of Alzheimer's patients.