When constipation occurs after taking montelukast, it is recommended to stop using montelukast, and the symptoms can generally be relieved soon. Montelukast mainly has an astringent effect and is mainly used to treat diarrhea and protect the intestinal mucosa, the side effect is mainly constipation. If constipation occurs, you can properly drink more water and exercise, and the constipation will be relieved soon after you stop using the drug, and you can also properly consume dietary fiber in your diet, or eat bananas or dragon fruit, and the constipation will be relieved soon. For patients with constipation caused by montelukast, it is recommended that the usual use of montelukast can be reduced or discontinued as appropriate and replaced by other drugs to treat diarrhea, so that the problem of constipation caused by montelukast will not occur easily.