The medication used on the buttocks when children have a fever is called a fever reducer, which is a way to reduce fever by inserting it directly into the anus and absorbing it through the rectal veins. The main ingredients used in children are acetaminophen or ibuprofen, whichever is preferred. The principle of applying antipyretic suppositories is that it can be applied if the body temperature is ≥38.5℃, or the mental state is not good in the fever state, accompanied by cold hands and feet, or with a history of febrile convulsions in the past. After the application of antipyretic suppositories, if you want to achieve a good antipyretic effect also need to cooperate with the physical cooling, you can choose to drink more water, with warm water repeatedly and constantly wipe the way or application of antipyretic patches, etc., together can play the best antipyretic effect.