The duration of fever-reducing drugs for infants depends on the temperature of the fever and the state of the disease, for example, infants in a high fever state, body temperature > 39 ℃, at the same time, their own immune function is not particularly good or short-term feeding is relatively poor, this time in the oral antipyretic medication for antipyretic treatment, the fever subsides after the fever is likely to be in about 4-6 hours again fever. If the infant fever temperature is not very high, in 38.5 ℃ or so, the child’s mental state is good, after the application of antipyretic drugs may no longer have a fever, may have a fever once, so the specific duration of antipyretic drugs depends on the infant’s own immune function, disease state and fever temperature to analyze the combination of high and low.