Choosing the correct chemotherapy, including the type, quantity and duration it must be taken, is very important for the efficiency of the treatment of cancer. Since chemotherapy drugs are considered dangerous, excessive amounts of it can cause severe side effects. But if too little is given, it may not destroy the cancer cells.
In choose the formula for chemotherapy the oncologist will consider a number of factors, such as the type of cancer, the stage of cancer, the health of the patient, any other illnesses they may be suffering from, past cancer treatments (if any), side effects, and the reactions between chemotherapy drugs used together. Patients may receive just one drug at a time or multiple drugs. Using multiple drugs is more effective than using one drug at a time.