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. It works in the brain to change how your body feels and responds to pain. Higher doses of this drug (more than 36 milligrams per dose or 72 milligrams per day) should be used only if you have been regularly taking moderate to large amounts of an opioid medication. These doses may cause overdose (even death) if taken by a person who has not been regularly taking opioids. Do not use the extended-release form of oxycodone to relieve pain that is mild or that will go away in a few days. This medication is not for occasional ("as needed") use.