Opana ER 20 mg stands for “Oxymorphone Hydrochloride extended-release tablets”. It is a Generic name for “Oxymorphone”. It is used in the treatment of pain. It belongs to a group of drugs known as Opioids (narcotic analgesics). Opana ER 20 mg is the shape of an eight-sided. It is supplied by Endo Pharmaceuticals Inc. It behaves on the central nervous system ...