Ibuprofen usually needs to be taken when the body temperature reaches 38.5 degrees to achieve a sweating fever reduction. If the body temperature is only 38.0 degrees when taking ibuprofen, it is possible to achieve a sweating fever reduction, but it is not too recommended. Ibuprofen can be taken only if the body temperature is 38.0 degrees and there is obvious discomfort, such as obvious headache, general discomfort or even fear of cold, muscle aches and pains all over the body, or back pain. There are two reasons for this: 1. now there is fear of cold and the body temperature is still in the rising period, it is likely that the body temperature has reached or even exceeded 38.5 degrees when the effect of ibuprofen occurs. 2. because there are obvious symptoms at this time, ibuprofen can reduce fever, but also has an analgesic effect, which can also be effective for headache and general muscle aches and pains. If ibuprofen is taken at a body temperature of 37.5 degrees, it will not achieve the effect of reducing fever.