A high fever of 39 degrees after taking fever-reducing drugs and then fever may be because the blood concentration of fever-reducing drugs is not enough, not completely clear the disease infection. Treatment is generally physical therapy, drug therapy, etc..
1. Antipyretic blood concentration is not enough: antipyretic drugs through sweating to achieve the purpose of cooling, the peak value of the general effect of the drug in 1-2 hours after taking the drug. After that, the blood concentration of the drug will slowly decline, which may make the body temperature rise again.
It is not recommended to take another antipyretic if it has not been taken for more than 4 hours because the drug has not been metabolized by the body. If it takes longer than 4 hours, you can take an additional dose of antipyretic, not more than 4 times a day. You can use warm water bath or external ice packs for physical cooling treatment.
2. Not completely remove viral and bacterial infections: fever and temperature repeatedly rise and fall, may be due to viral or bacterial infections are not completely removed. At this time, only symptomatic use of antipyretic drugs, can make the body temperature drop temporarily, but later will rise again. You can take oral antiviral and bacterial drugs such as buspirone oral solution and amoxicillin as prescribed by your doctor.
It is recommended to go to the hospital immediately to identify the cause of the fever after it has subsided, so as to avoid delays in the treatment of the disease.