When the fever is 39 degrees, the first thing to do is to reduce the fever, otherwise it is very bad for the body. At this time, you can drink ibuprofen suspension, usually after an interval of 4-6 hours can be repeated once, the specific dose also needs to be used according to the weight, according to the instructions. In addition, it is also necessary to treat the cause of the fever according to the symptoms that accompany it. If there are symptoms of cold, it is necessary to take Pudilan anti-inflammatory oral solution at the same time. If there are symptoms of diarrhea, it is better to take norfloxacin. If the above symptoms are not present, it is best to go to the hospital for a specific examination to check the specific cause of the disease and treat the cause in order to effectively reduce the fever. Can not take drugs indiscriminately, this is also very bad for the body.