Oxymorphone ( Opana , Numorphan , Numorphone ) or 14-Hydroxydihydro morphinone is a powerful semi-synthetic opioid analgesic first developed in Germany circa or about 1914, patented in the USA by Endo Pharmaceuticals in 1955 and introduced to the United States market in January 1959 and other countries around the same time. more

Oxymorphone ( Opana , Numorphan , Numorphone ) or 14-Hydroxydihydro morphinone is a powerful semi-synthetic opioid analgesic first developed in Germany circa or about 1914, patented in the USA by Endo Pharmaceuticals in 1955 and introduced to the United States market in January 1959 and other countries around the same time. It is related to morphine in the same fashion that oxycodone is to codeine , is derived from thebaine , and is approximately 6?8 times more potent than morphine . It differs from morphine in its effects all other things being equal in that it generates more euphoria, but less itching and other histamine effects. Depending on the individual patient, it can be either more or less nausea- and vomit-inducing than morphine. less