Bendamustine is a chemotherapy drug that is used to treat various types of cancers, including non-Hodgkin's lymphoma, chronic lymphocytic leukemia, and multiple myeloma. It works by damaging the DNA of cancer cells, preventing them from dividing and growing. Bendamustine is typically administered intravenously and is often used in combination with other chemotherapy drugs. It has been shown to be effective in treating certain types of cancer, particularly in patients who have not responded well to other treatments. Bendamustine is generally well-tolerated, with common side effects including nausea, vomiting, and low blood cell counts.