Chemotherapy drugs are powerful medications used to treat cancer by targeting and killing rapidly dividing cells. These drugs can be administered in various ways, including intravenously, orally, or through injections. They work by disrupting the cancer cells' ability to grow and multiply, but they can also affect healthy cells, leading to side effects. There are many different types of chemotherapy drugs, each designed to treat specific types of cancer or to be used in combination with other treatments. Common side effects include nausea, fatigue, and hair loss, but these vary depending on the individual and the specific drugs used.