Semicarb, also known as montelukast, is mainly indicated for acute and chronic diarrhea in adults and children, and is also effective as an adjunctive treatment for pain associated with diseases of the esophagus, stomach and duodenum. The specific course of treatment for montelukast is not clearly defined. If the clinical use of Simethicone, which is used to improve diarrhea or as a mucosal protector, does not improve significantly in about 3 days, it is recommended that the patient should go to the hospital to further clarify what causes the diarrhea and other diseases, and whether the disease can be controlled by Simethicone alone. There are no special adverse reactions to the drug, i.e. montelukast, occasional constipation and dry stools, and no contraindications, so it is very safe to use in clinical practice, so there is no specific time limit for the course of treatment, which is chosen according to the condition.