Oxycontin OC 5mg is categorized as an opioid drug and serves as a controlled-release painkiller that contains the semi-synthetic opioid oxycodone. Its operational mechanism in the body is similar to that of other opioid analgesics, binding to opioid receptors in both the brain and spinal cord. The effectiveness of this medication is evident when the body perceives pain, triggering a series of intracellular molecular reactions that lead to pain relief.