Taking ibuprofen can reduce fever quickly, and it usually works about thirty minutes after taking the medicine, but the time to reduce fever varies with different body types and conditions. It is not recommended to use fever medication blindly when fever occurs, but only if the axillary temperature exceeds 38.5 degrees. If the axillary temperature does not exceed 38.5 degrees, it is recommended to temporarily use physical cooling methods, such as wiping the patient’s neck, armpits, palms, feet and forehead with warm water, or using cold towels to ice the forehead, while also paying attention to the temperature of the surrounding environment not to be too high, so as not to affect heat dissipation. If the axillary temperature exceeds 38.5 degrees, you can take ibuprofen to reduce fever, but you should pay attention to the frequency of taking the medicine at an interval of about 6 hours and not more than 4 times in 24 hours, and you should pay attention to the hydration during the period of taking the medicine to avoid dehydration due to heavy sweating. Ibuprofen and other antipyretic drugs can quickly lower the body temperature, but do not eliminate the root cause of the disease, it is easy to have recurring symptoms, so it is recommended that the primary disease causing the fever should be clarified in a timely manner and actively treated to eliminate the root cause of the fever.