Drugs which are given to treat cancer are called chemotherapy drugs. Cancer cells are our own body cells , but due to some mutations and changes, these cells start dividing at very fast speed and gets converted to cancer. Chemotherapy drugs destroy these fast dividing cancer cells.
Chemotherapy drugs are of different types and different drugs are given in different patients.
Chemotherapy drugs are generally given in form of injections, but some drugs are given in form of tablets also.