Tramadol is an opioid medication used to treat moderate to severe pain in adults. The usual dose is 50-100 mg every 4-6 hours, up to 400 mg per day. Common side effects include constipation, dizziness, drowsiness, nausea, vomiting, and sweating. Serious side effects include serotonin syndrome, seizures, and an increased risk of opioid addiction, overdose, and death. Tramadol should not be used for longer than five days or with other opioids or benzodiazepines. People taking tramadol should not drink alcohol, as this can increase the risk of serious side effects. Contact for additional subtleties: +44 20 80895563