Eisai Submits New Drug Application for Subcutaneous Formulation of “LEQEMBI®” for the Treatment of Early Alzheimer's Disease in Japan

Core Viewpoint - Eisai Co., Ltd. and Biogen Inc. have filed a new drug application for a subcutaneous formulation of LEQEMBI (lecanemab) in Japan, aiming to provide an alternative administration route for Alzheimer's disease treatment [1][2][3] Group 1: Drug Application and Administration - The application is based on Phase 3 Clarity AD open-label extension data, confirming that a once-weekly subcutaneous administration of 500 mg is equivalent to the current intravenous administration every two weeks [2] - If approved, the subcutaneous autoinjector (SC-AI) would allow patients to administer LEQEMBI at home, potentially reducing healthcare resource utilization associated with intravenous dosing [3] Group 2: Clinical Efficacy and Safety - LEQEMBI targets both protofibrils and amyloid plaques, addressing the neurotoxic processes in Alzheimer's disease, and has shown a safety profile similar to intravenous administration with less than 2% incidence of systemic reactions [2][4] - The drug is currently approved in 51 countries and regions and is under regulatory review in 9 countries, indicating a broad acceptance and ongoing evaluation of its efficacy [4][9] Group 3: Collaboration and Development - Eisai leads the global development and regulatory submissions for lecanemab, with Biogen co-commercializing and co-promoting the product [5][11] - The collaboration between Eisai and BioArctic has been ongoing since 2005, focusing on the development and commercialization of Alzheimer's disease treatments [12]