Used primarily in the management of asthma, this chemical helps prevent bronchoconstriction by blocking leukotriene receptors, reducing inflammation and airway narrowing. It is effective in reducing asthma symptoms and the need for rescue inhalers, particularly in mild to moderate persistent asthma. Commonly prescribed for long-term control, it is taken orally and supports improved lung function when used regularly. Not intended for acute asthma attacks but rather for ongoing prevention and control.