Singulair is used for the prevention and long-term treatment of asthma. Singulair is used to prevent asthma attacks caused by exercise. Singulair is also used to treat allergy symptoms. Montelukast works by blocking substances in the body called leukotrienes. Blocking leukotrienes improves asthma and seasonal or perennial allergic rhinitis symptoms. Singulair may also be used to treat other conditions as determined by your doctor.
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Allergic rhinitis, more commonly known as hay fever or allergies, occurs when your body perceives tiny particles in the air as "foreign" and rallies your immune system against them..
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