Moxifloxacin and levofloxacin both belong to the quinolone class of antibacterial drugs, but there are differences in antibacterial spectrum, clinical application and adverse reactions. 1. Antibacterial spectrum: Levofloxacin is the third generation of quinolone anti-inflammatory drugs, moxifloxacin is the fourth generation of quinolone anti-inflammatory drugs. Both are effective against Gram-positive, Gram-negative, anaerobic and atypical pathogens. However, against Pseudomonas aeruginosa, levofloxacin is better than moxifloxacin, and against anaerobes, moxifloxacin is better than levofloxacin. 2. Clinical application: moxifloxacin and levofloxacin can be used for multi-site infections, but moxifloxacin is usually not suitable for urinary tract infections, while levofloxacin is suitable. 3. Adverse reactions: both have adverse reactions that cause changes in blood glucose and other mild symptoms, but levofloxacin has a higher probability of occurrence. As for causing neurological symptoms, moxifloxacin has a higher probability of occurrence. When patients need to take moxifloxacin and levofloxacin, it is recommended to do so under the guidance of a doctor, not self-medication.