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The body that trigger allergic and asthmatic reactions. 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, flu, abdominal pain and cough. Before taking Montelukast, tell your doctor or pharmacist if you are allergic to it or if you have any other allergies.