Percocet is one of the most powerful opioid painkillers on the market, and it's also one of the most addictive. One in every 130 adults who take it every day will become addicted to it. The good news is that you don't need a prescription to get Percocet; you can buy Percocet online without a prescri... Percocet is one of the most powerful opioid painkillers on the market, and it's also one of the most addictive. One in every 130 adults who take it every day will become addicted to it. The good news is that you don't need a prescription to get Percocet; you can buy Percocet online without a prescription overnight.