Montelukast (oral route) - Side effects & dosage - Mayo Clinic
: You can fill your prescription at national chains like Walgreens , CVS Pharmacy , and Walmart.
You can buy (or its generic version, montelukast ) at most major pharmacies and through certified online prescription services, but you must have a valid prescription from a healthcare provider to purchase it. It is not available over-the-counter (OTC). Where to Buy