Frequent consumption of montelukast may lead to functional constipation as well as poor bowel movement, which can be harmful to the body. Montmorillonite powder is clinically more commonly used antidiarrheal drugs, the main ingredient is montmorillonite, the properties of off-white or off-white or yellowish fine powder, there is a kind of sweet taste, mainly used for adults and children with acute and chronic diarrhea and so on. Montmorillonite powder is generally not easily absorbed by people, a small number of patients will have the adverse reaction of mild constipation, if often taken, it may gradually accumulate in the gastrointestinal tract, which leads to functional constipation as well as poor defecation, and so on. In addition, when taking Montelukast, it should be noted that it is contraindicated for those who are allergic to any of the ingredients in the medicine. Regular consumption of Montelukast may cause some harm to the body, and it is recommended to use the drug under the guidance of a doctor.