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Mepolizumab – Uses, Mechanism & Side Effects

Mepolizumab is a monoclonal antibody used to treat severe eosinophilic asthma and other eosinophilic conditions. It works by blocking interleukin-5, thereby reducing eosinophil levels in the blood.

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Things worth knowing about "Mepolizumab"

Mepolizumab is a monoclonal antibody used to treat severe eosinophilic asthma and other eosinophilic conditions. It works by blocking interleukin-5, thereby reducing eosinophil levels in the blood.

What is Mepolizumab?

Mepolizumab is a humanized monoclonal antibody that targets interleukin-5 (IL-5), a signaling protein (cytokine) that plays a key role in the production, maturation, and survival of eosinophils – a type of white blood cell that, when overactivated, can trigger damaging inflammatory responses. Mepolizumab is marketed under the brand name Nucala® and is approved by regulatory authorities including the European Medicines Agency (EMA) and the U.S. Food and Drug Administration (FDA).

Mechanism of Action

Mepolizumab binds specifically to interleukin-5, preventing it from attaching to its receptor on the surface of eosinophils. This leads to a significant reduction in circulating and tissue eosinophil counts. By inhibiting the IL-5 pathway, the drug directly reduces eosinophilic inflammation, which is a key driver in several chronic conditions.

Approved Indications

Mepolizumab is approved for the following conditions:

Severe eosinophilic asthma: as an add-on maintenance therapy for adults, adolescents, and children aged 6 years and older whose asthma is not adequately controlled despite high-dose inhaled corticosteroids and other medications.
Eosinophilic granulomatosis with polyangiitis (EGPA): a rare autoimmune disease affecting blood vessels and multiple organs.
Hypereosinophilic syndrome (HES): a condition characterized by persistently elevated eosinophil counts causing organ damage.

Dosage and Administration

Mepolizumab is administered as a subcutaneous injection (under the skin), typically once every four weeks. The standard dose for severe eosinophilic asthma is 100 mg in adults and adolescents, and 40 mg in children aged 6 to 11 years. For EGPA and HES, a higher dose of 300 mg (given as three separate 100 mg injections) is used. After proper training, patients may self-administer the injection at home.

Side Effects

Mepolizumab is generally well tolerated. The most common side effects include:

Headache
Injection site reactions (redness, pain, swelling)
Back pain
Fatigue
Nasopharyngitis (cold-like symptoms)
Urinary tract infections

Rare but serious side effects include anaphylaxis (severe allergic reaction), which requires immediate medical attention. Because eosinophils also play a role in defending against parasitic infections, mepolizumab may increase susceptibility to such infections in patients living in or traveling to endemic areas.

Clinical Significance and Treatment Context

Mepolizumab represents a significant advance in biologic therapy for respiratory and eosinophilic diseases. It is indicated when conventional treatments such as inhaled corticosteroids, long-acting beta-2 agonists, or oral corticosteroids are insufficient. Clinical trials have demonstrated that mepolizumab significantly reduces the rate of asthma exacerbations, improves lung function, and enhances patients quality of life. Additionally, it has been shown to have an oral corticosteroid-sparing effect, helping to reduce long-term steroid-related side effects.

References

Bel EH et al. - Oral glucocorticoid-sparing effect of mepolizumab in eosinophilic asthma. New England Journal of Medicine, 2014; 371(13): 1189-1197.
European Medicines Agency (EMA) - Nucala (mepolizumab): Summary of Product Characteristics. URL: https://www.ema.europa.eu (accessed 2024).
Global Initiative for Asthma (GINA) - Global Strategy for Asthma Management and Prevention, 2023. URL: https://ginasthma.org

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