Use: - Prevention and long-term treatment of bronchial asthma in adults and children from 15 years of age, including the prevention of day and night symptoms of the disease, treatment of bronchial asthma in patients with hypersensitivity to acetylsalicylic acid, and prevention of bronchospasm caused by physical exertion. - Relief of day and night symptoms of seasonal and/or perennial allergic rhinitis in adults and children from 15 years of age. How to take: - The drug is taken orally once a day, regardless of food intake. - For the treatment of bronchial asthma, Singulair should be taken in the evening. - For the treatment of allergic rhinitis, the drug can be taken at any time of the day as desired by the patient. - Patients suffering from bronchial asthma and allergic rhinitis should take Singulair in the evening. - The dose for adults and children over 15 years of age is 10 mg/day (1 film-coated tablet). - The therapeutic effect of Singulair on indicators reflecting the course of bronchial asthma develops within the first day. - Do not stop taking Singulair during an exacerbation of asthma and when it is necessary to use emergency relief medications (short-acting inhaled beta2-agonists) to relieve attacks. - The effectiveness of Singulair for oral administration in the treatment of acute asthma attacks has not been established, therefore Singulair tablets are not recommended for the treatment of acute asthma attacks. Patients should be instructed to always carry emergency relief medications for asthma attacks (short-acting inhaled beta2-agonists). Contraindications: - Hypersensitivity to any component of the drug. - Children under 15 years of age. - Lactase deficiency, lactose intolerance, and glucose-galactose malabsorption.