Fever infusion usually requires infusion ranging from 3 to 14 days, and there are more factors affecting the duration of infusion, mainly including the cause of fever, the degree of fever, and the effect of treatment. 1. Cause of fever: If the fever is caused by upper respiratory tract infection, the infusion time is about 3 days; if the fever is caused by bacterial infection, the infusion time may need 3 to 5 days; if the fever is caused by rheumatism, immunity, tumor and other diseases, and the heat lasts for a long period of time, it may need to carry out 7 to 14 days of infusion, or even longer. 2. Degree of fever: when the fever is low, it usually does not affect the function of organs, and may not be infused, or may need to be infused for about 2-3 days; when the fever is moderate, it may be accompanied by coughing, dyspnea and other problems, and the infusion time is about 5-7 days; when the fever is high, it is mostly accompanied by the symptoms of organ insufficiency, and the infusion time has to be decided in conjunction with the condition. 3. Therapeutic effect: will also affect the infusion time, such as the choice of antibiotics are not sensitive, need to adjust the medication, fever time that is prolonged. If you need to reduce fever through infusion, you should improve the relevant examination, clarify the cause of fever, infusion therapy under the guidance of the physician, do not blindly infusion or stop the drug, in order to avoid recurrence of the disease.