Montelukast is mainly used in clinical practice for the treatment of acute and chronic diarrhea, so generally after taking the drug, the diarrhea is relieved and the drug can be stopped. If the symptoms do not improve after one day for acute diarrhea and three days for chronic diarrhea, it is necessary to consult a doctor promptly to find the cause of diarrhea. In addition, montelukast has the function of protecting the mucous membrane of the digestive tract, removing pathogenic bacteria and removing toxins, which will cause adhesion with food, resulting in weakening the effect of adsorbing toxins, so it is recommended that patients take it half an hour before meals.