Opana ER (extended-release oxymorphone) is an extended-release opioid drug designed to deliver long-lasting pain relief to patients with moderate to severe chronic pain. The extended-release mechanism ensures a consistent release of the drug over a period of time, ensuring prolonged pain control without frequent medication. Buying Opana ER online provides patients with a convenient way to effectively treat their pain, but it must be taken strictly as per a prescription from a physician to reduce risks of abuse and addiction.