Moxifloxacin is a broad-spectrum antibacterial drug that belongs to the fluoroquinolone class of antibacterial drugs. It has broad-spectrum antibacterial activity against Gram-positive and negative bacteria, anaerobic bacteria, and atypical pathogens such as Mycoplasma, Chlamydia, and Legionella, and it has antibacterial activity against both Mycobacterium tuberculosis and nontuberculous mycobacterial infections. Moxifloxacin is a concentration-dependent drug, that is, the bactericidal activity is related to the blood concentration, but not to time, like penicillin, cephalosporins belong to the time-dependent antibacterial drugs, so it should be divided into 2, 3, or even 4 times a day to administer the drug. Concentration-dependent drugs are recommended to be given 1 time for 1 day, so that the blood concentration is high and better effects can be achieved. At the same time, moxifloxacin is a dual hepatic and renal excretory drug, so the requirements for liver and kidney function are not great, and generally mild impairment of liver and kidney function does not require dose adjustment. Moxifloxacin is also called respiratory quinolone, which means that its drug concentration is higher in these organs of the lungs and bronchi, so it is more suitable for the treatment of infectious diseases of the respiratory tract.