Merck & Co.

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Merck & Co.

A long-running biopharmaceutical company, it grew from a small American operation in 1891 into a global business focused on medicines and vaccines. It is known as MSD outside the United States and Canada.

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Merck & Co., Inc. is an American biopharmaceutical company headquartered in Rahway, New Jersey. The company says its purpose is to use leading-edge science to save and improve lives, and it operates as Merck Sharp & Dohme, or MSD, outside the United States and Canada.

Its roots in the United States go back to January 1, 1891, when George Merck established the company to distribute chemicals in New York. Over time, it expanded into research, medicines, and vaccines, growing into one of the world's major pharmaceutical businesses.

Today, the company presents itself as a research-intensive organization working across human health. Its story is closely tied to more than a century of scientific development, international growth, and a continuing focus on discovering and developing new treatments.