title: A comparative trial of two expectorants in general practice.
mesh_terms: D001991:Bronchitis / Q000188:drug therapy; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004155:Diphenhydramine / Q000627:therapeutic use; D005100:Expectorants / Q000627:therapeutic use*; D005194:Family Practice; D006801:Humans
chemical_list: D005100:Expectorants; D004155:Diphenhydramine