Montelukast works well for allergic cough. Montelukast is a leukotriene receptor antagonist, which is specifically used for the treatment of allergic rhinitis and allergic cough. It is really effective in clinical practice. Some people may experience some side effects after taking montelukast, some may experience dizziness, some may experience mild nausea, some may experience allergies, although it is an anti-allergy drug, and some may experience endocrine disorders, but these side effects are uncommon and may occur occasionally.