In the present invention there is provided an oral pharmaceutical composition, comprising bendamustine or a pharmaceutically acceptable, ester, salt or solvate thereof as an active ingredient, and a pharmaceutically acceptable excipient, which is a pharmaceutically acceptable non-ionic hydrophilic surfactant.本發明提供一種口服醫藥組成物,其包含作為活性成分之苯達莫司汀(bendamustine)或其藥學上可接受之酯、鹽或溶劑化物以及藥學上可接受之賦形劑,該藥學上可接受之賦形劑為藥學上可接受之非離子型親水性表面活性劑。