Endo Pharmaceuticals specializes in the research and development of market prescription pharmaceuticals for pain treatment and management. Established in 1920, the company has a portfolio of branded products that includes established brand names, such as LIDODERM, OPANA, PERCOCET, FROVA and Voltaren gel. Endo Pharmaceuticals has a work force of more than 800 sales representatives throughout the United States. It offers branded pharmaceutical products to medical services providers that specialize in the areas of pain management, neurology, surgery, anesthesiology, oncology and primary care. The company also serves retail pharmacies and healthcare professionals throughout the United States. In addition, Endo Pharmaceuticals manufactures a variety of generic products.