Cephalon, which operates under the names Cephalon Inc. and Cephalon Pharmaceuticals, is headquartered in Frazer, Pennsylvania, in the United States. The company has been known for its dedication to developing and marketing innovative pharmaceutical products that address unmet medical needs. Cephalon focuses on several therapeutic areas, including central nervous system disorders, pain, and oncology. While this location serves as the main hub for the company, it is important to note that Cephalon may have various facilities and subsidiaries located in other regions as well. For the most current and specific information about Cephalon’s locations, it would be advisable to check their official website, where you can find details about their facilities, operations, and contact information.