Thank you for your interest in Eisai. In order for us to respond to all customer inquiries as quickly and helpfully as possible, please direct your inquiry to the appropriate office for your country or region. (For global-related issues, please contact our global head office in Tokyo, Japan.)
For a list of Eisai offices for each country and region along with website links and our Contact Form, simply click on the appropriate button below.
Please note: We respectfully ask that all customers contact the appropriate office for their respective country or region. Contacting an Eisai office in charge of a different country or region may result in our response being unavoidably delayed or, in some cases, undelivered. We thank you for your cooperation and apologize in advance for any inconvenience this may cause.
Eisai Worldwide
For inquiries, please complete the Contact Form. We will endeavor to respond to you as quickly as possible, although there may be some delay depending on the nature of the inquiry and other factors. Alternatively, please call the number below during the following business hours: Monday to Friday, 9 a.m. to 5 p.m. (JST).
Please note that Eisai Head Office will be closed for the Winter vacation period from Saturday, December 28, 2024 to Sunday, January 5, 2025, and therefore we will be unable to respond to inquiries during this time. We apologize for any inconvenience caused and thank you for your understanding.
Main Switchboard: 81-3-3817-3700