title: A study of pre-operative sedatives.
mesh_terms: D001463:Barbiturates / Q000627:therapeutic use; D002697:Chloral Hydrate / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use*; D008702:Methaqualone / Q000627:therapeutic use; D010919:Placebos; D011229:Preanesthetic Medication
chemical_list: D001463:Barbiturates; D006993:Hypnotics and Sedatives; D010919:Placebos; D002697:Chloral Hydrate; D008702:Methaqualone