Schering-Plough Corporation is a pharmaceutical company started in Germany by Ernst Schering in 1851. The company was originally a U.S. subsidiary of Schering AG but following the entry of the United States into World War II in 1941 U.S. President Franklin Delano Roosevelt ordered Schering AG's U.S. assets be seized, The company was placed under a government administratorship until 1952 when it was released and its assets sold to the private sector. In 1971 Schering Corporation merged with Plough, Inc. to form Schering Plough.
Today Schering Plough manufactures several pharmaceutical drugs, the most well-known of which are the allergy drugs Claritin and Clarinex, and through a collaboration with Merck & Co., Zetia, an anti-cholesterol drug.