| Merck & Co., Inc. (Merck) is a global research-driven pharmaceutical company that discovers, develops, manufactures and markets a range of products to improve human and animal health. The Company's operations are principally managed on a products basis and comprises of two business segments: the Pharmaceutical segment and the Vaccines segment. The Pharmaceutical segment includes human health pharmaceutical products marketed either directly or through joint ventures. Merck sells these human health pharmaceutical products primarily to drug wholesalers and retailers, hospitals, government agencies and managed health care providers, such as health maintenance organizations, pharmacy benefit managers and other institutions. The Vaccines segment includes human health vaccine products marketed either directly or through a joint venture. These products consist of preventative pediatric, adolescent and adult vaccines, primarily administered at physician offices. |