Doxorubicin is a chemotherapy medication used to treat various types of cancer, including breast cancer, lung cancer, and leukemia. It works by interfering with the DNA in cancer cells, preventing them from growing and dividing. Doxorubicin is often administered intravenously and is known for its effectiveness in shrinking tumors. Despite its benefits, doxorubicin can have side effects, such as nausea, hair loss, and an increased risk of infection. It may also affect the heart, so doctors monitor patients closely during treatment. Overall, doxorubicin is a crucial tool in the fight against cancer.