Levofloxacin has a better improvement effect on lung infections induced by sensitive bacteria, but it is unable to exert anti-infective effect on infections induced by other bacteria or fungi or viruses. Levofloxacin has a broad-spectrum antibacterial effect, with strong antibacterial activity against gram-negative bacteria such as Escherichia coli, Klebsiella, Aspergillus, Salmonella, Shigella and Haemophilus influenzae. Meanwhile, it also has some antibacterial effect on gram-positive bacteria such as Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes, and Mycoplasma pneumoniae and Chlamydia pneumoniae. Lung infections are more complex and can be caused by other factors, such as common coronaviruses, adenoviruses, respiratory syncytial viruses, etc., as well as fungi such as Candida, Aspergillus, Cryptococcus, etc., which can also cause lung infections. In such cases levofloxacin has little or no anti-infective effect, and the medication is ineffective at this time. Serious and other important adverse reactions to levofloxacin include tendonitis and tendon rupture, peripheral neuropathy, central nervous system effects, anaphylactic reactions, QT prolongation, and C. difficile-associated diarrhea. Contraindicated in persons with hypersensitivity to quinolones, pregnant and lactating women, and patients under 18 years of age. Lung infections need to be regulated under the guidance of a doctor, avoid self-medication, in order to avoid delay or adverse reactions.