Also known as: Eisai
Eisai is a Japanese pharmaceutical company headquartered in Tokyo. It was established in 1941, employs around 10,000 people, and is listed on the Tokyo Stock Exchange.
A review of 17 studies involving 20,342 patients found anti-amyloid Alzheimer’s drugs had “trivial” effects after 18 months and increased the risk of brain swelling and bleeding. A separate PET study suggested ARIA-E may mark brain regions with greater amyloid plaque reduction.
NICE has upheld appeals to review its guidance on Alzheimer's drugs lecanemab and donanemab, sending the decision back to committee. The manufacturers argued NICE failed to account for the treatments' wider impact on unpaid carers. This comes amid broader challenges in neurodegenerative disease research following recent high-profile clinical trial failures.
Merck announced multiple data presentations at the 2026 ASCO GU Cancers Symposium, including results from trials evaluating pembrolizumab combinations in muscle-invasive bladder cancer and renal cell carcinoma.
GSK agreed to license linerixibat to Alfasigma in a deal worth up to $690 million, while Eisai received orphan drug designation in Japan for E2086, a novel selective orexin 2 receptor agonist for narcolepsy.
BioArctic reported net revenues of SEK 184.0 M for Q4 2025, driven by Leqembi royalties and Novartis partnership income. Leqembi received multiple regulatory approvals and submissions across global markets during the quarter.
Merck stock reached a 52-week high at $122.69, rising 46.25% over 12 months and 7.4% in the past month following strong Q4 results and improved long-term pipeline outlook beyond Keytruda's 2028 patent expiration.
