Many parents rush to use medicine as soon as they find their child has a fever, thinking that the faster the medicine works and the lower the body temperature, the better. In fact, you can’t be too hasty with fever-reducing medicine, and you should pay attention to 4 key moments. When the body temperature reaches 38.5℃ or more, you can use antipyretic drugs. 38.5℃ or less fever is generally a safe category that the body’s immune function can cope with, so there is no need to take antipyretic drugs. At this time, you can drink an appropriate amount of warm water or oral rehydration salts and let your body sweat or urinate to help reduce the temperature. You can also take physical cooling at the same time, such as wiping the head, neck and limbs with warm water that is lower than body temperature, or wiping the armpits, hands and feet with low-concentration alcohol. If you use antipyretic prematurely, it will not only affect the body’s immune function and prolong the course of the disease, but may also make the diagnosis of the primary disease more difficult because the antipyretic conceals the symptoms. In addition, the drug may also bring certain side effects. If the child has a history of febrile convulsions, it is still recommended to use antipyretic drugs early. The medication starts to take effect half an hour after taking it. The onset of action of antipyretic drugs requires a process, usually between half an hour and two hours. After taking the medicine, pay attention to the temperature and the child’s performance, do not rush to add or change the medicine, so as not to cause drug overdose. Commonly used antipyretic drugs such as ibuprofen and paracetamol are generally recommended to be taken at intervals of more than 6-8 hours before the next dose. Many people, in order to quickly lower the temperature, take the same kind of medicine less than the interval immediately, or take other antipyretic drugs at the same time. This can easily cause the accumulation of antipyretic drugs and damage the liver and kidneys. Stop the medication when the body temperature drops below 38.5℃. When the body temperature drops below 38.5℃, the body’s autoimmune protection mechanism is restored and can be regulated by physical cooling measures. Discontinuing the drug at this time can also reduce the damage to the body from the drug. If the medication is not effective for 3 times, it is better to consult a doctor. Generally speaking, if you can initially determine that the fever is caused by a cold, the symptoms are not serious, the fever does not exceed 39.5 ℃, and the child is in good spirits, you can first drink more water at home, take antipyretic drugs and observe. However, if the fever does not go down after two or three times of taking medicine, or if the fever is accompanied by vomiting or diarrhea, or if the fever continues to be high and does not go down and the mental state is poor, you should go to the hospital in time to avoid delaying the treatment. In short, do not be in a hurry when fever and other symptoms appear, so as not to use the wrong medicine. It is advisable to take physical cooling at this time, and it is best not to give injections and fluids if oral medication can solve the problem. If the cause of the fever is not clear, it is best to consult a doctor in time to avoid delaying treatment.