title: Double-blind study of endoscopy premedications.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002986:Clinical Trials as Topic; D004945:Esophagoscopy; D005260:Female; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008614:Meperidine / Q000627:therapeutic use*; D008875:Middle Aged; D011292:Premedication; D011581:Psychological Tests
chemical_list: D008614:Meperidine