Montelukast is a potent and selective blocker of the CysLT1 receptor. Accordingly, a recent study has shown that Montelukast can improve symptoms of seasonal allergic rhinitis and asthma in patients with both diseases. For treatment of asthma, Montelukast is administered once daily to adults as a 10-mg film-coated tablet, to children aged 6-14 years as a 5-mg chewable tablet, and to children aged 2-5 years as a 4-mg chewable tablet form. Asthma and allergic rhinitis have been linked clinically for many years as "one airway one diseases". Patients with allergic asthma and rhinitis are significantly more likely to experience asthma attacks compared to patients with asthma alone. Side effects most commonly reported above placebo included headache, otitis media, upper respiratory infection, and pharyngitis
