The antihistamine drugs in the treatment of hay fever in the adult.
D018926:Anti-Allergic Agents; D006632:Histamine; D006633:Histamine Antagonists; D006255:Rhinitis, Allergic, Seasonal
D018926:Anti-Allergic Agents; D006633:Histamine Antagonists; D006632:Histamine
HISTAMINE/antagonists