[Determination of therapeutic effect of antihistaminics---clinical effect of HS 592].
D002986:Clinical Trials as Topic; D006634:Histamine H1 Antagonists / Q000627:therapeutic use*; D006801:Humans; D010919:Placebos; D011759:Pyrrolidines / Q000627:therapeutic use*; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy
D006634:Histamine H1 Antagonists; D010919:Placebos; D011759:Pyrrolidines