title: Tramadol: hyponatraemia.
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects*; D006801:Humans; D007010:Hyponatremia / Q000139:chemically induced*; D014147:Tramadol / Q000009:adverse effects*
chemical_list: D000701:Analgesics, Opioid; D014147:Tramadol