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Opana is the brand name for oxymorphone. It is a powerful semi-synthetic opiate analgesic. It comes under the category of long-acting narcotics.
The pain relief after injecting Opana ER begins after 5-10 minutes and lasts for about 12 hours.
Oxymorphone, the active ingredient in Opana ER pills, acts on the brain to change the way the body senses and responds to pain.