Levofloxacin is a quinolone antimicrobial drug, and antimicrobial drugs are not recommended for long-term use. This will destroy the normal growth of flora in the body and cause dysbiosis. Levofloxacin is a quinolone antimicrobial drug, which has a significant therapeutic effect on a variety of urinary and respiratory pathogenic bacteria. The duration of antimicrobial use is based on factors such as different sites of infection and different pathogenic bacteria. If the treatment effect is not good, it is recommended to take specimens from the infected area for culture to determine the causative organisms and their drug sensitivity test, and then change the sensitive antimicrobial drugs according to the results of the treatment. Levofloxacin instructions clearly suggest that this drug is prohibited for patients under 18 years of age, renal insufficiency, elderly patients, patients with neurological disorders, etc. should be used with caution or under strict supervision.