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Tramadol is a centrally acting analgesic used for moderate to moderately severe pain. The 100 mg dose may be prescribed in extended-release or immediate-release forms depending on clinical needs. Tramadol works through opioid receptors and by influencing serotonin and norepinephrine, which means it can interact with antidepressants and raise seizure risk in susceptible individuals. Side effects include dizziness, nausea, constipation,