Can you tell me how a doctor decide whether to prescribe percocet or percodan (oxycodone and aspirin)?

Aspirin or tylenol (acetaminophen): If an individual has an acute injury and will need a strong pain reliever for a short time, it really doesn't matter much which drug the doctor recommends. People with history of ulcers shouldn't take Aspirin (which is in Percodan) and people with liver problems should avoid tylenol (acetaminophen) (Percocet). If they are to be used long-term, Percocet is better tolerated than an Aspirin containing medication.