It usually takes about 1-2 hours for the fever to go down even if the body temperature is 40℃ when taking Merlin. If the effect is relatively fast, it is also possible to reduce the fever within 1 hour. the sign of fever reduction is sweating. 40℃ is a relatively high temperature and the person’s discomfort will be more obvious. If it is an adult headache and generalized aches and pains are likely to be more pronounced. If it is a child, without timely treatment, the body temperature continues to rise, there is a risk of febrile convulsions, so it is more important to take antipyretic drugs. But because there will be a period of time after taking Merlin and then fever, the child’s body temperature may continue to rise, then you can give the child some physical cooling, or use antipyretic paste on the forehead and other parts of the body, so as to avoid the body temperature continues to rise, to prevent the body temperature in this period of time rose too high, resulting in febrile convulsions.