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Eisai's main manufacturing campus in the United States is located in Research Triangle Park, NC.

This site includes a state-of-the-art 190,000-square-foot facility, which initially opened in 1997 and was expanded in 2003. This facility is used to manufacture, package and perform laboratory testing for commercial oral solid dose products, as well as the formulation and development of aseptically produced compounds used for clinical trials.

The RTP campus also includes the new 65,000-square-foot parenteral facility, which opened in May 2010. This facility employs state-of-the-art high-hazard containment technology and will be utilized for the commercial production and formulation research and development of intravenous drug products. The new facility also has a microbiological laboratory to support commercial and development sterility needs.

The global logistics function for Eisai and certain Eisai affiliates are also based at the RTP facility and includes department personnel who manage and provide oversight for the production of drug products made by external manufacturing companies.

Eisai Inc. has an additional specialty manufacturing site in Baltimore, MD.