Double blind study involving the mixture of medications and different tablet forms.
D018926:Anti-Allergic Agents; D004311:Double-Blind Method; D006634:Histamine H1 Antagonists; D006801:Humans; D010656:Phenylephrine; D010919:Placebos; D006255:Rhinitis, Allergic, Seasonal; D013566:Sympathomimetics; D013607:Tablets
D018926:Anti-Allergic Agents; D006634:Histamine H1 Antagonists; D010919:Placebos; D013566:Sympathomimetics; D013607:Tablets; D010656:Phenylephrine
ANTIHISTAMINICS; HAY FEVER; PHENYLEPHRINE; PLACEBOS; SYMPATHOMIMETICS