👉 Chemotherapy is a type of treatment that uses drugs to kill cancer cells. It works by targeting and destroying cancerous cells in the body, rather than repairing or stimulating healthy cells. Chemotherapy can be used for many types of cancer, including breast, lung, ovarian, head and neck, and gastrointestinal cancers. Some common chemotherapy drugs include methotrexate, vinblastine, doxorubicin, etoposide, and cisplatin.