Oxycodone 40 mg is a high-strength opioid pain reliever prescribed for patients who need around-the-clock, long-term treatment for severe pain. It is most commonly found in extended-release (ER) form and is intended for patients who are already opioid-tolerant. Due to its potency, Oxycodone 40 mg is not suitable for opioid-naive patients and carries a high risk of addiction, abuse, and overdose.