The present invention provides a novel means for improving the stability of indomethacin in the liquid or semi-solid composition. A liquid or semi-solid composition includes the following component (A) and component (B): (A) indomethacin or a salt thereof； (B) plant of arnica genus or an extract thereof. Furthermore, the component (B) is arnica montana or an extract thereof.本發明提供一種改善液狀或半固體狀之組成物中之吲哚美辛之穩定性之新穎手段。一種液狀或半固體狀之組成物，其含有以下成分(A)及(B)：(A)吲哚美辛或其鹽；(B)兔菊屬之植物或其萃取物。
