Percodan is a prescription medication used for treating moderate to severe pain. It is a combination of oxycodone, a powerful opioid, and aspirin, a non-steroidal anti-inflammatory drug (NSAID). Percodan is classified as a Schedule II controlled substance due to its high potential for dependence and abuse. There are several synonyms or alternative names for Percodan, including: 1. Endodan - another brand name for the same combination of oxycodone and aspirin. 2. Percocet - a medication similar to Percodan that contains oxycodone and acetaminophen instead of aspirin. 3. OxyContin - a medication containing only oxycodone and used for treating chronic pain. 4. Vicodin - a combination of hydrocodone and acetaminophen that is also used for treating pain.