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Tramadol is a prescription medication that is primarily used to relieve moderate to moderately severe pain. It is classified as an opioid analgesic, and it works by binding to mu-opioid receptors in the brain and spinal cord, where it modifies the perception of pain. In addition to its opioid activity, tramadol also has other effects on neurotransmitters in the brain, particularly serotonin and norepinephrine, which can contribute to its pain-relieving properties.