First of all, levofloxacin hydrochloride is a quinolone antibiotic, which is used to treat the following mild and moderate infections caused by sensitive bacteria: first, respiratory system infection, acute sinusitis, acute episode of chronic bronchitis, community acquired pneumonia. Second, urinary system infection, such as acute pyelonephritis, complex urinary tract infection, etc. Third, reproductive system infections, such as prostatitis, epididymitis, uterine infection, adnexitis, pelvic inflammation. Fourth, skin and soft tissue infection, such as infectious impetigo, cellulitis, lymphangitis, subcutaneous abscess, perianal abscess, etc. Fifth, intestinal infection, such as bacterial dysentery, infectious enteritis, salmonella enteritis, typhoid fever and paratyphoid fever. Sixth, other infections, such as trauma, burn and postoperative wound infection, abdominal cavity infection, mastitis, cholecystitis, cholangitis, bone and joint infection, and five sense organ infection.