Montelukast is a very common clinical antidiarrheal drug with good antidiarrheal effect, but it is not a panacea, and the following points should be noted when taking it: First, when treating acute diarrhea, especially when the number of diarrhea is high, rehydration treatment is needed in this case to avoid dehydration caused by diarrhea. The second point is that for infectious diarrhea, it should be applied together with antibiotics. In addition, the effect of montelukast will be better when applied together with drugs that regulate intestinal flora. The third point is that montelukast can be applied to both children and adults, the dosage is different, ask your doctor or read the instructions. The fourth point is that one of the more common side effects of montelukast is constipation.