A case of fatal poisoning caused by a combination of tramadol and benzodiazepines.

Tramadol exerts analgesic effects by acting as an agonist of μ-opioid receptor and by inhibiting reuptake of serotonin and noradrenaline. Here we report an autopsy case of a woman in her thirties, with multiple drugs detected. Based on the autopsy findings and toxicological examination results, we concluded the death was attributed to the ingestion of tramadol and benzodiazepines, which was thought to have primarily resulted from CNS depression. Co-ingested drugs should be considered when evaluating toxicity.