Moxifloxacin belongs to the 4th generation of quinolone antibiotics and can be used to inhibit diseases caused by Streptococcus pneumoniae, Haemophilus influenzae, and Catamorium spp. The effect of taking it for 4 days is related to the severity of the disease. If only minor Streptococcus pneumoniae infection, Haemophilus influenzae infection, minor Catamoeba infection, etc., the patient’s symptoms are not obvious, the course of the disease is relatively short, the drug 4 days may see the effect, depending on the circumstances. For more serious infectious diseases, such as sinusitis, pneumonia, skin infections, abdominal infections, etc., moxifloxacin taken alone for 4 days may not be able to see the effect, and in severe cases, it is necessary to use a longer period of time. If prolonged use is not effective, consider switching to glucocorticoid medications such as dexamethasone and betamethasone. When using moxifloxacin, it is important to know that it is contraindicated for people who are allergic to the drug ingredients or to quinolones, for people under 18 years of age, and during pregnancy and breastfeeding. Caution is required for patients who are using hypoglycemic drugs. After using the drug, there may be symptoms such as diarrhea, nausea, vomiting, etc. If the symptoms are relatively mild, no special treatment is needed, and those with serious illnesses can stop using it in time. The use of moxifloxacin must be under the guidance of a professional physician, not unauthorized use of drugs.