If a patient with pulmonary tuberculosis has taken the drug for 5 months, the necessary course of treatment is usually not reached. The general clinical choice is to combine multiple anti-tuberculosis drugs for the treatment of tuberculosis, such as isoniazid, rifampin, ethambutol, etc. For initially treated tuberculosis, the general choice is to take the drugs continuously for 6-9 months to be completely cured. And for relapsed TB, you need to take the drugs for about a year. And for refractory Mycobacterium tuberculosis infection with the presence of drug-resistant bacteria, the course of treatment may take up to about one and a half years, or even two years. Therefore, it is necessary to review the CT of both lungs at any time to observe the changes, and if necessary, to take sputum for drug sensitivity test to clarify the cause and condition, and to adjust the drug regimen and the course of treatment in time.