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"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."
"Singulair is a new type of medication for the prevention and control of asthma for the long term. Singulair is a leukotriene receptor antagonist used for the prevention and control of asthma for the long term. Singulair is steroid-free and offers the convenience of a once-daily tablet. Before taking Montelukast, tell your doctor or pharmacist if you are allergic to it or if you have any other allergies."