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Contact Us

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

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