Haloperidol, or norfloxacin, and levofloxacin both belong to the quinolone class of drugs, and there are differences in their chemical structure, antibacterial spectrum, indications and so on. 1. Chemical structure: Levofloxacin is the levofloxacin, its chemical composition and structure are different from norfloxacin. 2. Antibacterial spectrum: Levofloxacin has antibacterial effect on a variety of gram-negative and gram-positive bacteria, and its antibacterial spectrum is wider than that of norfloxacin. 3. Indications: Levofloxacin is suitable for the treatment of hospital-acquired pneumonia, community-acquired pneumonia, acute bacteremic sinusitis, acute bacterial attack of chronic bronchitis and other diseases. Norfloxacin is mainly used for the treatment of intestinal infections, urinary tract infections and so on. The use of levofloxacin and norfloxacin should be carried out under the guidance of medical professionals, if there are adverse reactions such as diarrhea, nausea, vomiting, skin rash, etc. in the process of use, it is necessary to stop the drug in time and go to the hospital, and it is prohibited for those who are allergic to quinolones.