Oxycontin is a prescription pain medication that is used to treat moderate to severe pain. It is a long-acting opioid medication that is taken orally. Oxycontin is available in different strengths and forms, including tablets, capsules, and extended-release tablets. The extended-release tablets are designed to release the medication slowly over time so that it can be taken every 12 hours. Oxycontin should only be used by people who are already taking opioid medications for pain relief and are tolerant to them.