Diarrhea caused by chemotherapy can be treated with drugs such as montelukast and loperamide hydrochloride capsules as prescribed by the doctor. 1. Montelukast: This drug is mainly used in the clinic for the treatment of acute and chronic diarrhea in adults and children, but it is forbidden for those who are allergic to the ingredients of this drug. And after chemotherapy diarrhea, you can also take the drug to relieve the symptoms. However, patients need to pay attention to correct dehydration during the use of the drug, if constipation occurs, patients also need to reduce the dosage dose. 2. Loperamide hydrochloride capsules: the drug is mainly used in clinical control of acute and chronic diarrhea symptoms, and diarrhea caused by chemotherapy, you can also take the drug, but allergic to the drug is prohibited. And some patients may experience headache, dizziness, flatulence, abdominal discomfort, epigastric pain and other adverse reactions after taking the drug. It is recommended that patients with diarrhea caused by chemotherapy should strictly follow the doctor’s instructions and read the instruction manual carefully before using the drug to understand the relevant content.