Montelukast is a medication primarily used to manage and prevent asthma symptoms and to relieve seasonal allergies. It works by blocking leukotrienes, which are chemicals in the body that cause inflammation, bronchoconstriction, and mucus production in the airways. This medication is typically taken as a daily oral tablet and is suitable for both adults and children. While it can help improve breathing and reduce allergy symptoms, it is important to follow a healthcare provider's instructions and report any unusual side effects.