Order Oxycodone Online Get It Safely Quickly, Oxycodone is a strong pain reliever prescribed for moderate to severe pain. It works by changing how your brain perceives pain. Available in immediate and extended-release forms, it's used for conditions like fibromyalgia and post-surgery pain. Common side effects include dizziness, nausea, and constipation. Oxycodone can be addictive, so it's important to follow your doctor's instructions carefully. It can also interact with other medications, such as MAO inhibitors and other opioids, so your healthcare provider should manage its use closely.