Opana ER (oxymorphone hydrochloride) is a prescription opioid pain reliever that is used to treat severe pain. It is a Schedule II drug, which means that it has a high potential for abuse and addiction. If you are considering buying Opana ER online, it is important to use a reputable and reliable source. There are many websites that sell counterfeit or fake Opana ER, so it is important to do your research before making a purchase.