The pre-benzodiazepine era.
D001463:Barbiturates / Q000494:pharmacology; D001965:Bromides / Q000494:pharmacology; D002697:Chloral Hydrate / Q000494:pharmacology; D049673:History, 20th Century; D006801:Humans; D006993:Hypnotics and Sedatives / Q000266:history*; D008620:Meprobamate / Q000494:pharmacology; D010242:Paraldehyde / Q000494:pharmacology
D001463:Barbiturates; D001965:Bromides; D006993:Hypnotics and Sedatives; D002697:Chloral Hydrate; D008620:Meprobamate; D010242:Paraldehyde