Anti-inflammatory drugs generally take effect in one to three days, a few patients may take longer. For common bacterial infections, anti-inflammatory drugs take about three days to take effect, if the drug sensitivity culture using targeted drugs, it may only take about a day to play a significant anti-inflammatory effect, manifested in the patient’s body temperature will gradually return to normal and other accompanying symptoms of the reduction. If the symptoms do not improve after three days of antibacterial drugs, it means that antibacterial drugs are ineffective and need to be replaced with other antibacterial drugs. The onset of action of anti-inflammatory drugs can not be generalized, and the patient’s own physical and other factors are also related to a small number of patients may prolong the onset of action. It is important to note that anti-inflammatory drugs generally stimulate the gastric mucosa, so the time to take the drug is usually after meals.