DRUG CLASS AND MECHANISM: Montelukast is an oral leukotriene receptor antagonist for the treatment of asthma and seasonal allergic rhinitis (hay fever). Leukotrienes are a group of naturally occurring chemicals in the body that promote inflammation in asthma and seasonal allergic rhinitis and in other diseases in which inflammation is important (such as allergy).
Before using montelukast, tell your doctor if you are allergic to any drugs (especially aspirin). You may need a dose adjustment or special tests to safely use this medication.
SIDE EFFECTS: Unusual weakness, stomach upset, diarrhea, dizziness, cough, headache, nausea, vomiting, trouble sleeping, or mouth pain may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. Tell your doctor immediately if any of these unlikely but serious side effects occur: hallucinations, fever, persistent sore throat or earache, flu symptoms.
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