The present invention relates to an oral pharmaceutical composition comprising bendamustine in combination with a modified cyclodextrin, such as, e.g., methyl-ß-cyclodextrin or hydroxypropyl-ß-cyclodextrin. It has surprisingly been found in the context of the invention that such compositions exhibit a greatly improved oral bioavailability, which renders them particularly advantageous for oral therapeutic application, e.g., in the treatment of cancer.