A fever of 39.4 degrees is generally more serious, and already belongs to the high fever, especially for the elderly or children, the situation will be more serious. The first thing to do is to use antipyretic drugs for treatment, as long as the body temperature is greater than 38.5 degrees, it is necessary to use antipyretic drugs to reduce fever. It is necessary to reduce the body temperature to below 38.5 degrees, especially for children under five years old, because children are affected by high fever, prone to hyperthermic convulsions, which may cause damage to the child’s brain function. Oral medication can be used to reduce fever, for example, ibuprofen suspension or acetaminophen suspension can be taken orally to reduce fever. If the child is six years old or older, a fever reducer can also be used to reduce the fever by inserting a fever reducer into the child’s anus. In the case of adults, indomethacin suppositories can be inserted into the anus to reduce the fever. It is best to apply a fever reducer patch on the forehead to relieve the discomfort caused by high fever and also to protect the functioning of the brain.