Order Opana ER online; It treats moderate to severe pain in people who cannot control their pain with other medicines. Oxymorphone belongs to the class of drugs known as opiate (narcotic) analgesics. It works by altering how the body reacts to pain. It was invented around 1914 by a group of scientists in Germany. It was first patented in 1955 and approved for medical use in 1959.
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