Oxycodone is an opioid pain medication that can remain in the body for varying durations depending on dose, frequency, metabolism, age, and health. Typically, it is detectable in blood for up to 24 hours, urine for 3–4 days, and hair for up to 90 days. Effects include pain relief, drowsiness, and euphoria, but misuse can cause dependence, respiratory issues, or overdose. Understanding how long it stays in the system is crucial for safe use, medication planning, and passing drug tests. Always follow medical guidance to ensure effective and responsible use.