To provide a pharmaceutical composition which can enhance the storage stability of 1-(1-hydroxymethyl-2,3-dihydroxypropyloxymethyl)-2-nitroimidazole without impairing the effect of the compound. The pharmaceutical composition includes 1-(1-hydroxymethyl-2,3-dihydroxypropyloxymethyl)-2-nitroimidazole, which is represented by formula (1) : and a compound having chelating ability.本發明提供一種醫藥組合物,其可無損1-(1-羥甲基-2,3-二羥基丙氧基甲基)-2-硝基咪唑所具有之效果,而提高保存時之穩定性。該醫藥組合物含有由通式(1)所示之1-(1-羥甲基-2,3-二羥基丙氧基甲基)-2-硝基咪唑及具有螯合能力之化合物。
