Chemotherapy drugs are also known as cytotoxic drugs, but they are not equal to poisons, because the purpose of applying chemotherapy drugs is to kill tumor cells, save patients’ lives, prolong patients’ survival and improve patients’ quality of life. Toxic drugs are drugs that are toxic to human body but not beneficial. Chemotherapy drugs do have toxicity, such as gastrointestinal adverse reactions, bone marrow suppression, hair loss, liver and kidney damage, neurotoxicity, etc. However, strict control of the application dose of chemotherapy drugs, the indications of chemotherapy drugs, and good antagonism to the adverse reactions of chemotherapy drugs can obviously reduce the toxicity of chemotherapy drugs and thus apply their beneficial side, so chemotherapy drugs are not poisonous and Not equal to poison.