Taking anti-tuberculosis drugs with white blood cells below 2.0 x 10^9/L is dangerous. The range of normal white blood cell values is between (4 and 10) x 10^9/L. Below normal white blood cells is called leukopenia. If the degree of leukopenia is not high and is only mild, the risk of secondary serious infections is low and only requires prevention of colds, avoidance of flu, and good personal protection. If the degree of white blood cell lowering is greater, below 2.0×10^9/L, the risk of secondary infection is greater and is likely to be dangerous. Anti-tuberculosis drug-induced leukopenia must be taken seriously, white blood cells are a kind of immune cells, not only can phagocytosis of foreign substances in the body to produce antibodies, and can resist bacteria, viruses and other attacks on the human body, so leukopenia can lead to decreased immunity, so that the body is susceptible to infections, if the white blood cells are lower than 2.0×10^9/L, need to be adjusted under the guidance of the doctor’s medication.