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Mometasone – Uses, Mechanism and Side Effects
Mometasone is a synthetic corticosteroid with potent anti-inflammatory properties, widely used for allergies, asthma, and inflammatory skin conditions.
Things worth knowing about "Mometasone"
Mometasone is a synthetic corticosteroid with potent anti-inflammatory properties, widely used for allergies, asthma, and inflammatory skin conditions.
What is Mometasone?
Mometasone (commonly formulated as mometasone furoate) is a second-generation synthetic corticosteroid designed for topical and local use. It exerts strong anti-inflammatory, anti-allergic, and vasoconstrictive effects. Mometasone is available in multiple formulations, including nasal sprays, inhalers, creams, and ointments.
Indications
Mometasone is used to treat a range of conditions in which inflammation plays a key role:
- Allergic rhinitis (seasonal and perennial hay fever)
- Nasal polyps
- Bronchial asthma (as an inhaled corticosteroid)
- Atopic dermatitis (eczema)
- Psoriasis (plaque-type)
- Other inflammatory skin conditions such as contact dermatitis
Mechanism of Action
Mometasone binds to intracellular glucocorticoid receptors within target cells. The resulting receptor-ligand complex translocates into the cell nucleus, where it modulates gene transcription. This leads to suppression of pro-inflammatory mediators such as cytokines, prostaglandins, and leukotrienes, resulting in reduced inflammation, decreased mucosal swelling, and relief of allergic symptoms.
Because mometasone acts primarily at the site of application and is absorbed into the bloodstream only minimally, the risk of systemic side effects is substantially lower compared to orally administered corticosteroids.
Dosage and Administration
Nasal Spray
For allergic rhinitis or nasal polyps, mometasone nasal spray is typically applied once daily. Adults and adolescents aged 12 and over generally receive 2 sprays per nostril per day (200 µg total). For children between 3 and 11 years, a reduced dose of 1 spray per nostril daily is commonly recommended.
Inhalation for Asthma
When used for asthma, mometasone is administered via a dry powder or pressurized metered-dose inhaler. The dosage is determined individually by the treating physician based on disease severity.
Topical Application (Skin)
Mometasone creams and ointments are applied in a thin layer to the affected skin area once daily. Prolonged use should be avoided, especially on the face or in skin folds, to minimize the risk of skin thinning.
Side Effects
Mometasone is generally well tolerated. Possible side effects vary by formulation:
Nasal Spray
- Nosebleeds or nasal irritation
- Headache
- Rarely: nasal septum perforation with long-term use
Inhalation
- Hoarseness or throat irritation
- Oral candidiasis (thrush) – preventable by rinsing the mouth after inhalation
Topical (Skin)
- Skin atrophy (thinning) with prolonged use
- Stretch marks or local pigmentation changes
- Rarely: allergic contact reaction
Drug Interactions
Because mometasone acts predominantly at the local level, systemic drug interactions are uncommon. However, caution is advised when used alongside CYP3A4 inhibitors such as ketoconazole or ritonavir, as these agents can slow the metabolism of mometasone and increase systemic exposure.
Safety Considerations
- Mometasone should not be used in children under 2 years of age without medical supervision.
- Pregnant or breastfeeding individuals should consult a healthcare provider before use.
- Long-term therapy should not be discontinued abruptly without medical guidance.
- Caution is required if active infections (bacterial, viral, or fungal) are present at the site of application.
References
- European Medicines Agency (EMA): Summary of Product Characteristics for mometasone furoate-containing medicinal products. www.ema.europa.eu
- Barnes P.J. – Inhaled Corticosteroids. Pharmaceuticals, 2010; 3(3): 514-540. doi:10.3390/ph3030514
- Bousquet J. et al. – Allergic Rhinitis and its Impact on Asthma (ARIA) Guidelines. Allergy, 2008; 63(Suppl 86): 8-160.
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