TOKYO and CAMBRIDGE, Mass., May 8, 2026 /PRNewswire/ -- Eisai Co., Ltd. and Biogen Inc. (Nasdaq: BIIB) today announced that the U.S. Food and Drug Administration (FDA) has extended the review period by three months for the supplemental Biologics License Application (sBLA) for a once‑weekly lecanemab‑irmb subcutaneous injection (U.S. brand name: LEQEMBI® IQLIK™) as a starting dose for the treatment of early Alzheimer's disease.