Chlorambucil is a medication primarily used in the treatment of certain types of cancer, including chronic lymphocytic leukemia (CLL), lymphomas, and some types of ovarian cancer. It belongs to a class of drugs known as alkylating agents, which work by interfering with the DNA in cancer cells, ultimately leading to their death. Chlorambucil is typically taken orally in tablet form. It is often used in combination with other chemotherapy drugs or treatments for cancer.