PROBLEM TO BE SOLVED: To provide an aqueous pharmaceutical composition containing epinastine or a salt thereof, which can be expected to have an enhanced drug action by strongly inhibiting the burst of a pollen outer wall.SOLUTION: The present invention provides an aqueous pharmaceutical composition containing epinastine or a salt thereof, and trometamol.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】花粉外壁の破裂を強く抑制することにより、より強い薬効が期待できるエピナスチン又はその塩を含有する水性医薬組成物の提供。【解決手段】エピナスチン又はその塩と、トロメタモールとを含有する水性医薬組成物。【選択図】なし