A double-blind crossover trial of disodium cromoglycate powder in perennial allergic rhinitis.
D002648:Child; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004205:Cromolyn Sodium / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D010919:Placebos; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy* / Q000517:prevention & control
D010919:Placebos; D004205:Cromolyn Sodium