A fever of 40℃ is still relatively serious. In general, clinically, as long as the body temperature is greater than 38.5℃, it is recommended to use antipyretic drugs to reduce fever. In addition, a fever of 40 ℃ already belongs to high fever, as long as the body temperature between 39-40 ℃ is considered high fever, if more than 40 ℃ is ultra-high fever, or more dangerous, especially for children under 5 years old is more dangerous, it is easy to lead to high fever convulsions, which can cause damage to the child’s brain cells and brain function. When a high fever occurs, the various functions of the human body are often disrupted by high fever, and physical disorders can occur, such as disorders of water-electrolyte balance or digestive disorders, so a fever of 40 degrees Celsius is still relatively serious and must be treated actively to reduce fever. This time you can take oral ibuprofen suspension to reduce fever, and you can also use fever suppositories, but fever suppositories are only suitable for children over 6 years old or adults.