A Leading Global Research and Development-Based Pharmaceutical Company Headquartered in Japan. Eisai has positioned neurology and oncology as its therapeutic areas of focus, where there are many diseases for which adequate treatments have yet to be established. In order to fulfill patients’ unmet needs, Eisai sets out a goal to be a “Medico Societal Innovator” or in other words, “a company that changes society through creating medicines and providing solutions”.