What Is Oxycontin This medicine is used to treat extremely persistent pain (such as due to cancer).The group of medications known as opioid analgesics includes oxycontin. It alters how your body perceives and reacts to pain by acting on the brain. This medicine is utilized to assist with easing extreme continuous agony, (for example, because of malignant growth). Oxycontin has a place with a class of medications known as narcotic analgesics. It works in the cerebrum to change how your body feels and answers torment.