Do fever reducers reduce fever? Very little. There is no authoritative medical body that recommends fever-reducing patches to reduce fever. Why did the fever go down with the patch? Fever is a fluid that rises and falls. If the fever goes down in 1 hour with the patch, it will go down in 60 minutes without the patch. What is the function of fever reducer? 1, like a stamp on the forehead “I have a fever”, to reduce the spread of disease. 2.Comforting parents and making them feel that they are “trying hard to help their child”.