How long does it take for a fever to go down with a drip is related to the severity of the condition, the effectiveness of treatment, etc., and cannot be generalized. Generally speaking, if it is a common cold, the patient’s previous physical condition is good, active symptomatic treatment, 3~5 days will be recovered; if there are many previous underlying diseases, the recovery may take a longer time. 1. Common cold: most of them are caused by viral infections, which are self-limiting, and the fever will recover on its own in 3~5 days. Clinical symptomatic treatment is needed, and if the temperature is lower than 38.5℃, physical cooling can be chosen; if the temperature is more than 38.5℃, drugs such as ibuprofen can be taken to treat the illness. 2. Fever caused by bacterial infection: mild bacterial infection, you can take cefoxitin, cefuroxime and other drugs, 2~3 days after the body temperature will return to normal, serious bacterial infection, if not timely use of antibiotics, may make the patient’s body temperature continues to rise for 5~7 days, and in serious cases, it will also cause the bacteria to enter the bloodstream, sepsis. How long does it take for a fever to go down with a drip should be checked in time in the hospital, and standardized treatment should be carried out under the guidance of the doctor.