The effect of ibuprofen suspension starts after 30 minutes in most cases, and the body temperature will gradually return to normal after about 1-2 hours. Ibuprofen suspension can be used after a high fever of 38.5°C. It is a non-steroidal antipyretic drug for children, which can reduce fever mainly by causing the body to sweat, thereby distributing excess heat. If the effect of taking ibuprofen suspension alone is not particularly satisfactory, it can be supplemented with physical cooling, such as bathing in warm water, drinking warm water, etc., for a better effect of fever reduction. In addition, it is clinically found that when ibuprofen suspension is taken on an empty stomach, the time for it to work after absorption by gastrointestinal peristalsis will be shortened accordingly. However, if a child has recurrent fever and cannot use antipyretic drugs blindly, he or she needs to go to the hospital promptly to find the cause. In conclusion, patients with high fever should take appropriate relief measures in a timely manner and seek medical attention for the cause if necessary. Pay attention to rest, eat lightly and avoid straining.