Percocet is a drug made of the combination of an opioid drug (narcotic), pain reliever (oxycodone). It is also a non-opioid drug pain reliever (acetaminophen). When you buy Percocet online, it is either taken for the treatment of moderate to severe pain or to suppress fever when taken with acetaminophen. If you buy the drug from an online pharmacy, make sure that you know everything about the drug beforehand.