Levofloxacin is a quinolone antibiotic, clinically used for community-acquired pneumonia, acute bacterial sinusitis, skin and soft tissue infections, simple or complicated urinary tract infections. The dosage of Levofloxacin tablets depends on the specific disease being treated. The details are as follows. 1. For community-acquired pneumonia, 0.5g each time, once a day for 7 days. 2. For acute bacterial sinusitis, 0.5g each time, once daily, for 10-14 days. 3. For skin and soft tissue infections, 0.5g each time, once daily for 7-14 days. 4. For acute simple lower urinary tract infection, 0.5g each time, once daily for 5-7 days. 5. For complicated urinary tract infection, 0.5g each time, once daily, for 10-14 days. When using this drug, it should be noted that levofloxacin can cause nausea, vomiting, headache and dizziness, tendonitis and tendon rupture and other adverse reactions. It should be noted that it is contraindicated in patients with hypersensitivity to quinolone drugs, as well as in pregnant and breastfeeding women and patients under 18 years of age due to its effect on joint development. Specific drug use should also be carried out under the guidance of a professional physician, and should not be used on its own to avoid adverse reactions.