Levofloxacin is a class of antibiotics with broad-spectrum antibacterial effect, with strong antibacterial activity against gram-negative bacteria. It also has antibacterial effect on some gram-positive bacteria and Mycoplasma pneumoniae and Chlamydia pneumoniae, but has poor effect on anaerobic bacteria and enterococci, and is a broad-spectrum antibiotic with relatively wide coverage. It is a broad-spectrum antibiotic with a wide coverage. It has a precise therapeutic effect and is commonly used for intestinal and urinary tract infections. It has side effects and should be closely observed when used. Once there is fever, rash and other discomfort, it should be stopped immediately.