Namo Zenkai
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Opana ER (extended-release) is a brand name for the prescription medication oxymorphone hydrochloride. It belongs to a class of drugs known as opioid analgesics, which are used to manage moderate to severe pain.

The "ER" in Opana ER stands for extended-release, which means the medication is formulated to provide pain relief over an extended period, typically around 12 hours. This extended-release formulation allows for a slower release of the medication into the bloodstream compared to immediate-release formulations.