Montelukast can be taken for a long time. Montelukast is a kind of digestive system drug, the main ingredient is montelukast which has antidiarrheal effect and can be used to treat acute and chronic diarrhea in adults and children. This drug can be taken by pregnant and lactating elderly patients, but long-term use may cause constipation, but it will improve after stopping the drug, the duration of taking the drug should be decided according to the patient’s own condition. Montmorillonite has a certain adsorption effect for the treatment of toxins produced by germs in the digestive tract, and it is also a good adjunct for the treatment of pain caused by duodenal disease. This drug does not need to be taken according to a course of treatment and can be stopped when the patient’s symptoms disappear. This drug does not cause dependence or any side effects and is relatively safe for patients.