Buy Percocet online with its legal variants. Percocet is a painkiller that's part of a family of drugs known as opioids. Though some are derived naturally, such as heroin or morphine, others are synthesized in a lab, including Hydrocodone and Oxycodone. Percocet is the brand name of a drug that mixes Oxycodone and acetaminophen, the generic name for drugs such as Tylenol.