Vinblastine is a chemotherapy medication primarily used to treat various types of cancer, including Hodgkin's lymphoma and testicular cancer. It works by inhibiting cell division, which helps to slow down or stop the growth of cancer cells. This drug is derived from the periwinkle plant and is often administered intravenously in a clinical setting. Side effects may include nausea, hair loss, and increased risk of infection, as it can affect the bone marrow's ability to produce blood cells. Regular monitoring is essential during treatment.