Tramadol is a prescription medication that is used to treat moderate to moderately severe pain. It is a synthetic opioid, which means it is a man-made version of an opioid pain reliever. Tramadol is often used to treat pain that is not relieved by other types of pain medication, such as acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs). Tramadol works by binding to opioid receptors