Montmorillonite is an over-the-counter antidiarrheal drug. It is mainly used for adults and children with acute and chronic diarrhea. It is not absorbed by the gastrointestinal tract, does not change the normal intestinal peristalsis, does not change the running time of food from the mouth to the colon, and does not affect the normal digestion and absorption of nutrients, and is a mucosal protector of the digestive tract. The side effects of montelukast are rare and only a few people may suffer from constipation and dry stools. For children, montelukast is difficult to be excreted on its own, and if it covers the surface of the intestine for a long time, it may cause malnutrition as the intestine cannot absorb nutrients effectively. Therefore, this drug is not recommended for long-term use. It should be reminded that montelukast has certain indications, not all types of diarrhea can be used, so you must follow the doctor’s instructions before using it and pay attention to the following points: 1, montelukast should be taken on an empty stomach to be effective. 2, montelukast should be dissolved in plain water before use, preferably in the ratio of 1 bag (3 grams) with 50 ml of water. 3, montmorillonite will affect the absorption of other drugs, so when combined with other drugs, the interval should be 1 to 2 hours.