One prescription drug used to relieve moderate to severe pain is tramadol. It's an opioid analgesic, which is a class of medicines. By attaching itself to opioid receptors in the brain and spinal cord, tramadol modifies how the body experiences and reacts to pain. Its potential as a serotonin and norepinephrine reuptake inhibitor may possibly play a role in its analgesic properties. There are several types of Tramadol that are available, such as capsules, extended-release tablets, and tablets with quick release. The degree of pain and the patient's reaction to the drug determine the appropriate tramadol dosage and frequency of delivery.