The treatment plan for leukopenia primarily depends on the cause of the decreased white blood cells. If the cause is related to blood cancer, further examinations like bone marrow biopsy are needed, followed by treatment of the primary disease. The second most common scenario is liver cirrhosis, which can lead to a decrease in all three blood cell lines, causing reduction in white blood cells, platelets, and hemoglobin. In such cases, treatment options may include splenectomy or the use of oral medications that increase white blood cell count. However, these treatments only address the symptoms and not the root cause, which is liver cirrhosis, thus the primary disease still requires treatment. The third scenario involves severe bacterial and viral infections, where a decrease in white blood cells indicates a serious condition, necessitating further antiviral or anti-infection treatments. (Please follow the guidance of a professional physician for medication use, and do not self-medicate.)