Montelukast

What is Montelukast?

Montelukast is a prescription medication that belongs to a class of drugs called leukotriene receptor antagonists. It is primarily used to prevent and control asthma symptoms and to treat seasonal allergic rhinitis (hay fever). The medication works by blocking certain inflammatory substances in the body that can cause breathing difficulties and allergic reactions.

Uses

• Asthma prevention and control: Used as a long-term maintenance treatment to prevent asthma attacks and reduce daily symptoms in adults and children
• Exercise-induced bronchoconstriction: Prevents breathing difficulties triggered by physical activity in people with asthma
• Seasonal allergic rhinitis: Relieves symptoms of hay fever including sneezing, runny nose, nasal congestion, and itchy nose
• Perennial allergic rhinitis: Treats year-round allergy symptoms caused by indoor allergens like dust mites, pet dander, and mold
• Adjunct therapy: Used alongside other asthma medications like inhaled corticosteroids for better symptom control

How it works

Montelukast works by blocking leukotriene receptors in the lungs and airways. Leukotrienes are inflammatory chemicals released by the immune system that cause airway constriction, mucus production, and swelling in people with asthma and allergies. By preventing leukotrienes from binding to their receptors, montelukast helps keep airways open and reduces inflammation, making breathing easier and reducing allergic symptoms.

Side effects

Common side effects:

• Headache
• Stomach pain or upset
• Heartburn
• Fatigue or tiredness
• Fever
• Stuffy nose
• Cough
• Upper respiratory infection

Serious side effects to watch for:

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• Mood changes, depression, or suicidal thoughts
• Aggressive behavior or hostility
• Severe allergic reactions including rash, swelling, or difficulty breathing
• Hallucinations or confusion
• Tremor or muscle twitching

Warnings and precautions

• Mental health monitoring: Patients and caregivers should watch for changes in mood, behavior, depression, or suicidal thoughts, especially in children and adolescents
• Not for acute asthma: Montelukast should not be used to treat sudden asthma attacks; patients must have a rescue inhaler available for emergencies
• Pregnancy and breastfeeding: Generally considered safe during pregnancy (Category B) but should be used only when benefits outweigh risks; consult healthcare provider about use while breastfeeding
• Liver function: Use with caution in patients with liver disease, as the medication is metabolized by the liver
• Phenylketonuria: Chewable tablets contain aspartame and should be avoided by patients with phenylketonuria

Interactions

• Phenobarbital: May decrease montelukast effectiveness by increasing its metabolism in the liver
• Rifampin: Can reduce montelukast blood levels, potentially decreasing its therapeutic effect
• Gemfibrozil: May increase montelukast blood levels, potentially increasing side effects
• Warfarin: Montelukast may enhance the blood-thinning effects of warfarin, requiring more frequent monitoring
• Aspirin: High doses of aspirin may interact with montelukast in aspirin-sensitive asthmatic patients
• St. John’s Wort: This herbal supplement may reduce montelukast effectiveness by affecting liver metabolism
• Alcohol: May worsen potential mood-related side effects of montelukast
• Other asthma medications: Generally safe to use with inhaled corticosteroids and bronchodilators, but dosing adjustments may be needed

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Dosage

For adults and adolescents 15 years and older, the typical dosage is 10 mg taken once daily in the evening. For asthma, the medication should be taken in the evening, while for allergic rhinitis, it can be taken at any time of day. For exercise-induced bronchoconstriction, a single 10 mg dose should be taken at least 2 hours before exercise, with no additional doses within 24 hours. The medication can be taken with or without food. Dosage should always be determined and monitored by a healthcare provider, who may adjust the dose based on individual response and medical condition.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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