Percocet is a prescription drug which is a combination of oxycodone and Acetaminophen (or Tylenol). Oxycodone is part of the drug class called narcotic analgesics. Oxycodone is commercially made, from thebaine, which is an opiate alkaloid.It also includes minor component of opium.he reason for this being, Percocet is made in a time release tablet which is designed so that the oxycodone is released slowly over time. If too much of the drug is released at one time it can result in a very dangerous and possibly life threatening overdose.