Merck & Co., Inc. (Public, NYSE:MRK) [Merck Sharp & Dohme (MSD) outside the United States and Canada] is a global health care company that delivers health solutions through its medicines, vaccines, biologic therapies, and consumer and animal products, which it markets directly and through its joint ventures. The Company’s operations are principally managed on a products basis..Today's Merck is a global healthcare leader working to help the world be well.  Merck is known as MSD outside the United States and Canada.  They work with customers and operate in more than 140 countries to deliver innovative health solutions.

The Pharmaceutical segment includes human health pharmaceutical and vaccine products marketed either directly by the Company or through joint ventures. Human health pharmaceutical products consist of therapeutic and preventive agents, sold by prescription, for the treatment of human disorders. The Company 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.

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On November 3, 2009, the Company and Schering-Plough Corporation (Schering-Plough) completed their merger

The company ranked No. 78 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.

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