Letter: Sch 1000: a new anticholinergic bronchodilator.
D001249:Asthma / Q000188:drug therapy*; D001286:Atropine Derivatives; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D006801:Humans; D009241:Ipratropium / Q000627:therapeutic use*; D010276:Parasympatholytics / Q000627:therapeutic use*
D001286:Atropine Derivatives; D001993:Bronchodilator Agents; D010276:Parasympatholytics; D009241:Ipratropium