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These drugs lower the white blood cell count to a greater degree than the counts of other blood cells â red blood cells and platelets â although these are commonly affected, too. Fortunately, the effect of these drugs on the white blood cell count is usually both predictable and short-lived. The white cell count generally falls below the normal range about seven to ten days after a chemotherapy treatment and recovers within about a week after that.
The normal range of low to high WBC counts also varies by age and gender. A low WBC count is often linked to problems with the bone marrow and the inability to make enough white blood cells. Autoimmune diseases that attack your white blood cells can also lead to a low WBC count.Several different prescribed drugs, including chemotherapy, are known to decrease WBC production or destroy WBCs.A low WBC count can be serious because it increases your risk of developing a potentially life-threatening infection.utoimmune diseases that attack your white blood cells can also lead to a low WBC count. Several different prescribed drugs, including chemotherapy, are known to decrease WBC production or destroy WBCs. A low WBC count can be serious because it increases your risk of developing a potentially life-threatening infection.