Levofloxacin lactate and levofloxacin hydrochloride have different indications, different pharmacological effects and the same adverse reactions. Levofloxacin hydrochloride is mainly used for mild to moderate infections caused by sensitive bacteria, such as respiratory urinary system, genital system, skin and soft tissue infections, etc. Levofloxacin hydrochloride is mainly used for the treatment of moderate to severe respiratory, urinary and digestive system, typhoid and gonorrhea, Chlamydia trachomatis and other urethritis and cervicitis caused by gram-negative and gram-positive sensitive bacteria. Levofloxacin hydrochloride mainly inhibits the DNA rotase activity of bacteria and hinders bacterial DNA replication, characterized by a broad antibacterial spectrum and strong antibacterial effect, while levofloxacin lactate, mainly also inhibits bacterial DNA replication, but its effect is slightly weaker than the antibacterial spectrum and effect of levofloxacin hydrochloride.