It is not true that montelukast causes cancer. There are many causes of diarrhea, including viruses, bacterial infections, abdominal cold and poor dietary habits, etc. When treating diarrhea, you can take montelukast orally. This is an adsorbent antidiarrheal drug, which can mainly treat acute and chronic diarrhea in adults and children, and has no carcinogenic effect after consumption. When patients with diarrhea take montelukast, it can play the role of covering the mucous membrane of the gastrointestinal tract and treating diarrhea, as well as protecting the mucous membrane of the gastrointestinal tract. The use of montelukast can also assist in the treatment of gastroduodenal ulcers and other related diseases when pain occurs. It is also important to replenish the body with water in time to be able to correct dehydration while taking the drug, and should be avoided for a long period of time, as some patients are prone to constipation when taking it for a long time.