If green stools appear after taking montelukast, it is considered to be caused by indigestion and body cold. You should pay attention to the protection of the intestines and stomach, and pay attention to the warmth of the abdomen. You should pay attention to the diet of easily digestible and less stimulating food, not to eat greasy, spicy and stimulating food, and cold food. Gastrointestinal tablets can also achieve a good therapeutic effect, do a good job of abdominal warmth, you can rub hot hands on the abdomen, or use a hot water bag hot compress abdomen, when taking montelukast if constipation occurs, you need to pay attention to reduce the dosage of the drug. In case of discomfort, go to the hospital in time for consultation, and use the medication in a reasonable and appropriate amount to avoid side effects of overdose.