How To Order Opana ER Without Prescription || Buy Opana 10mg/20mg {{40-50% Huge Discount }}, Opana ER, also available as Numorphan or Opana, is an opioid medication. It helps treat moderate to severe pain. The extended-release form of oxymorphone is for around-the-clock treatment of pain or should not use-as-needed basis for pain. To get the medicine, you can buy Opana ER online. The use of opioid medications can cause addiction, overdose, or death.