Chemotherapy drugs are medications used to treat cancer by targeting and killing rapidly dividing cells. These drugs can be administered in various ways, including intravenously or orally, and they work by disrupting the cancer cells' ability to grow and multiply. While effective against many types of cancer, chemotherapy can also affect healthy cells, leading to side effects. There are different classes of chemotherapy drugs, such as alkylating agents, antimetabolites, and plant alkaloids. Each class works in a unique way to combat cancer. Treatment plans often combine multiple drugs to enhance effectiveness and minimize resistance, tailored to the specific type of cancer and patient needs.