The present invention provides a storage stability improved pharmaceutical preparation containing a compound of the following formula (I) or the pharmaceutically acceptable salt thereof.This storage stability excellent film coating pharmaceutical preparation consists of a formulation containing a compound of the following formula (I)or the pharmaceutically acceptable salt thereof, and its film layer is composed of film coating basic agent which contains one or more than two kinds chosen from polyvinyl alcohol, carboxymetyl cellulose, and pullulan.本發明提供含有如下式(I)化合物之貯藏安定性經改善之醫藥組成物。處方中含有如下式(I)化合物或其藥理容許鹽薄膜層中含有由聚乙烯醇、羧甲基纖維素鈉及三聚葡糖選擇之1種或2種以上薄膜塗覆基劑之貯藏安定性優異之薄膜塗覆製劑。
