title: Clinical study on epidural clonidine for postoperative analgesia.
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D002408:Catheters, Indwelling; D003000:Clonidine / Q000008:administration & dosage* / Q000009:adverse effects; D004824:Epidural Space; D006801:Humans; D008875:Middle Aged; D010149:Postoperative Pain / Q000188:drug therapy*
chemical_list: D003000:Clonidine