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Leukotriene Inhibitors – Effects, Uses & Side Effects

Leukotriene inhibitors are medications that block inflammatory signaling molecules called leukotrienes. They are primarily used to treat asthma and allergic rhinitis.

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Things worth knowing about "Leukotriene Inhibitors"

Leukotriene inhibitors are medications that block inflammatory signaling molecules called leukotrienes. They are primarily used to treat asthma and allergic rhinitis.

What Are Leukotriene Inhibitors?

Leukotriene inhibitors (also called leukotriene antagonists or leukotriene receptor blockers) are a class of medications that interfere with the activity of leukotrienes – naturally occurring inflammatory signaling molecules in the body. Leukotrienes play a central role in allergic and asthmatic conditions. By blocking the receptors to which these molecules bind, leukotriene inhibitors reduce airway inflammation, mucus production, and bronchoconstriction.

Mechanism of Action

Leukotrienes are produced in the body from arachidonic acid via the enzyme 5-lipoxygenase. They are released primarily by mast cells, eosinophils, and basophils – immune cells activated during allergic responses. Leukotrienes bind to specific receptors (mainly CysLT1 receptors) and trigger the following effects:

Narrowing of the airways (bronchoconstriction)
Increased mucus production in the respiratory tract
Promotion of tissue inflammation
Swelling of the nasal mucosa

Leukotriene inhibitors such as montelukast and zafirlukast competitively block CysLT1 receptors, preventing leukotrienes from binding and exerting their inflammatory effects. Another agent, zileuton, directly inhibits the enzyme 5-lipoxygenase, thereby preventing the formation of leukotrienes altogether.

Indications

Leukotriene inhibitors are used in conditions where leukotrienes play a significant role:

Bronchial asthma: As long-term maintenance therapy to prevent asthma attacks, often in combination with inhaled corticosteroids.
Allergic rhinitis: Treatment of seasonal or year-round allergic nasal symptoms.
Exercise-induced asthma: Prevention of asthma triggered by physical exertion.
Aspirin-exacerbated respiratory disease: For patients whose asthma is worsened by aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs).

Key Active Ingredients and Dosage

The most commonly used leukotriene inhibitors include:

Montelukast: The most widely prescribed agent. Approved for adults and children as young as 6 months. Typical adult dose: 10 mg once daily in the evening.
Zafirlukast: Approved for adults and children aged 5 and older. Taken twice daily.
Zileuton: Inhibits leukotriene synthesis; primarily used in the United States. Taken two to four times daily.

Dosage should always follow the prescribing healthcare professional's instructions. Leukotriene inhibitors are generally taken as tablets or chewable tablets.

Side Effects

Leukotriene inhibitors are generally well tolerated. Possible side effects include:

Headache
Gastrointestinal complaints (nausea, abdominal pain)
Fatigue
Elevated liver enzyme levels (particularly with zileuton)

A significant warning applies to montelukast: regulatory agencies including the FDA and EMA have highlighted potential neuropsychiatric side effects, including sleep disturbances, nightmares, anxiety, depression, and in rare cases suicidal ideation. Patients and caregivers should contact a healthcare provider immediately if such symptoms occur.

Drug Interactions

Leukotriene inhibitors may interact with other medications. Key interactions include:

Enzyme inducers such as rifampicin or phenobarbital may lower blood levels of montelukast, reducing its effectiveness.
Zileuton can inhibit the breakdown of theophylline and warfarin, leading to elevated blood levels of these drugs.

It is important to review all medications with a doctor or pharmacist before starting treatment with leukotriene inhibitors.

Leukotriene Inhibitors Compared to Other Asthma Medications

Leukotriene inhibitors are not rescue medications (emergency inhalers) but are used for the long-term control of asthma and allergic diseases. Compared to inhaled corticosteroids, they are considered somewhat less potent, but offer the advantage of oral administration (tablet instead of inhaler). They are frequently used as an add-on or alternative therapy in patients who cannot tolerate corticosteroids or whose asthma is not sufficiently controlled despite corticosteroid treatment.

References

Global Initiative for Asthma (GINA) – Global Strategy for Asthma Management and Prevention, 2023. Available at: https://ginasthma.org
European Medicines Agency (EMA) – Product Information for Montelukast, 2020. Available at: https://www.ema.europa.eu
Busse W, Kraft M. – Cysteinyl leukotrienes in allergic inflammation: strategic target for therapy. Chest. 2005;127(4):1312-1326. PubMed PMID: 15821211.

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