|Headquarters:||Chadds Ford, PA|
Endo Pharmaceuticals Inc. is an American pharmaceutical company. It was created as a result of a management buyout from DuPont Merck in 1997. Three DuPont Merck executives (Carol A. Ammon, Chairman, President & CEO, and Mariann T. MacDonald, Executive Vice President, Operations, along with another colleague) purchased all of Endo Laboratories L.L.C. 's generic products along with 12 important brand products, including Percocet and Percodan.