OxyContin is the brand name of the semisynthetic opioid, oxycodone. A prescription painkiller, OxyContin is most commonly prescribed to individuals who are experiencing moderate to severe pain, both acute and chronic.you can buy oxycontin online without prescription in USA. As is the case with other opioids, OxyContin’s analgesic properties are often accompanied by improved mood and a sense of relaxed euphoria. Unfortunately, these effects also make OxyContin an enticing substance for individuals who desire an illicit recreational high.