Buy Oxycodone Online is used to help relieve moderate to severe pain. 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. It is used to relieve pain severe enough to require opioid treatment and when other pain medicines do not work well enough or cannot be tolerated. It belongs to the group of medicines called opioid analgesic pain medicines.