The duration of levofloxacin use is related to the degree of infection, the type of infection and the individual situation of the patient and cannot be generalized. Levofloxacin is a clinically used quinolone antibacterial drug, which belongs to the broad-spectrum class of antibiotics and can act against a variety of bacterial bacteria, mycoplasma and chlamydia. In case of lower respiratory tract infection, such as bronchial dilatation co-infection, lung abscess, bronchitis and pneumonia, levofloxacin needs to be used for about 1 week; in case of upper respiratory tract infection, such as bronchitis and pharyngitis, it needs to be used for about 3-5 days; if it is used as a quadruple drug in anti-tuberculosis drugs, the treatment course needs to be about 2 months; in case of bacterial prostatitis, it usually needs about 6 weeks, while for simple lower urinary tract infection, it usually takes about 5-7 days. Patients are advised not to abuse drugs without permission, and need to communicate with their clinician before using them for targeted use.