PROBLEM TO BE SOLVED: To provide an imidafenacin-containing intraoral disintegrable tablet excellent in photostability.SOLUTION: This intraoral disintegrable tablet prepared by compression molding of imidafenacin-containing granules is characterized in that the concentration of the imidafenacin in the granules is 0.001 to 3 mass%, and the granules contain iron sesquioxide in an amount of &ge0.05 mass%.COPYRIGHT: (C)2011,JPO&INPIT【課題】光安定性に優れたイミダフェナシン含有口腔内速崩壊錠を提供する。【解決手段】イミダフェナシン含有顆粒を圧縮成型する製剤において、顆粒中のイミダフェナシンの濃度が0.001~3質量%であり、かつ錠剤中に三二酸化鉄を0.05質量%以上含有することを特徴とする口腔内崩壊錠。【選択図】なし