Otsuka America Pharmaceutical, Inc. (OAPI) is a successful, innovative, fast-growing healthcare company that commercializes Otsuka-discovered and other product opportunities in North America. Otsuka Pharmaceutical Development & Commercialization, Inc. (OPDC) is dedicated to developing and commercializing innovative healthcare products, on a global basis, that address unmet medical needs. Otsuka Maryland Medicinal Laboratories, Inc. (OMML) is the basic research center for investigating pharmacological actions of Otsuka's compounds.

* OAPI, OPDC and OMML are subsidiaries of Otsuka America, Inc. (OAI), a holding company established in the U.S. in 1989. OAI is wholly owned by Otsuka Pharmaceutical Co., Ltd.