Buying Oxycodone IR online, Oxycodone IR is called an immediate-release tablet. It is an FDA-approved medication; used to treat severe pain. This medication is sold in the market as brand name Hydrocodone, Oxycontin, and Roxicodone. Purchase Oxycodone online; it is a combination medication of the opioid class of hydrochloride and acetaminophen. Take it directly by mouth, with or without food and one glass of water. Oxycodone pill works approximately 15-30 minutes after taking.