Opana ER 15 mg is a prescription opioid medication containing oxymorphone in an extended-release form. It is designed to provide continuous, around-the-clock relief for severe chronic pain that requires long-term management. This medication helps maintain steady pain control throughout the day. Patients should use Opana ER 15 mg exactly as prescribed, with awareness of potential side effects such as dizziness, nausea, and the risk of addiction or respiratory depression.