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"Since Singulair is used to prevent asthma attacks, it should be taken regularly as prescribed even when you are not experiencing asthma symptoms. Montelukast can cause different side effects at varying degrees such as gastrointestinal disturbances, hypersensitivity or allergic reactions, sleep disorders, stomach upset, diarrhea, cough, dizziness, headache, nausea, vomiting, heartburn, hives and hoarseness of voice."