This medication 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.​You can buy Oxycodone online from our online pharmacy without a prescription. If you already have one, you can place your order online. This medication 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.