Oxycontin (oxycodone) is an opioid pain reliever used to treat moderate to severe pain. Buy Oxycontin Online a trading name for the narcotic oxycodone hydrochloride, is a painkiller available in the United States only by prescription. This medication is used to help relieve severe ongoing pain (such as due to cancer). Oxycodone belongs to a class of drugs known as opioid analgesics. OxyContin (also known as “oxy”) was developed in 1995 to provide long-lasting pain relief, so people with severe pain would not have to take pills as often. Buy Oxycontin Online was widely prescribed and became associated with abuse and addiction problems.