Changing drugs after four chemotherapy sessions is mainly due to the new progress of the disease, the original chemotherapeutic drugs may be ineffective, or due to allergy to the chemotherapeutic drugs or the body can no longer tolerate the side effects of the chemotherapeutic drugs.
Generally speaking, in the process of chemotherapy, if there is a change of drugs in the middle of the process, it is often because there is a new progression of the disease, and the original chemotherapy regimen is no longer effective, so at this time it is usually necessary to replace other chemotherapy drugs in order to inhibit the growth of the tumor more effectively.
It may also be due to the fact that after several chemotherapy treatments, the physical condition has become very poor, and the patient can no longer tolerate the side effects of the chemotherapy drugs or has allergies when using the chemotherapy drugs, and the chemotherapy drugs should be changed and adjusted under the guidance of the doctor at this time.