The present application relates to a pharmaceutical composition comprising fesoterodine or a pharmaceutically acceptable salt or solvate thereof and a stabilizer selected from the group consisting of xylitol, sorbitol, polydextrose, isomalt and dextrose.本發明關於一種含菲索特羅定或其於醫藥上可接受之鹽類或溶劑合物及安定劑之醫藥組成物,其由木糖醇、山梨糖醇、聚葡萄糖、異麥芽糖醇及右旋葡萄糖等構成之組群中選出。