Percocet is a brand name narcotic pain medication that includes a combination of the opioid painkiller oxycodone and the over-the-counter drug acetaminophen. It is approved to treat and help manage moderate to severe pain. It is also susceptible to abuse and can cause an opioid use disorder, even in people taking it as directed. Addiction to Percocet occurs when misuse of this drug gets out of control when an individual tries but fails to stop using it and continues in spite of the major problems that it causes in other areas of his or her life, such as relationships, health, and finances.