Low white blood cells after taking medication or stopping medication may be caused by insufficient treatment with medication or abnormal bone marrow hematopoiesis. 1. Insufficient drug treatment: It takes a certain period of time to treat leukopenia with drugs. If the course of treatment is insufficient, the effect of drug treatment will not be achieved. It is necessary to carry out reasonable and standardized treatment under the guidance of professional doctors. 2. Bone marrow hematopoietic abnormality: abnormal bone marrow hematopoietic system, there may be a decrease in white blood cells, if only the use of drugs to enhance the white blood cells can not achieve the therapeutic effect, such a situation needs to be treated at the same time as the bone marrow hematopoietic system abnormality can be relieved. If such a situation occurs, it is recommended to consult a doctor in time, under the guidance of a professional doctor for reasonable and standardized diagnosis and treatment.