Tramadol is a synthetic opioid analgesic, commonly prescribed to alleviate moderate to moderately severe pain. It works by binding to receptors in the brain that transmit pain signals, thereby reducing the perception of pain. In addition to its analgesic properties, tramadol also acts as a serotonin and norepinephrine reuptake inhibitor, which can contribute to its pain-relieving effects. Tramadol is often used for various conditions, including post-operative pain, chronic pain conditions, and certain types of injury-related pain.