Mometasone is a synthetic glucocorticoid corticosteroid widely used in medicine for its potent anti-inflammatory, immunosuppressive, and antipruritic properties. It is available in several formulations, including topical creams and ointments, nasal sprays, and [https://liporedux.fr/] inhaled preparations, each tailored to treat specific inflammatory conditions. Since its introduction in the late 20th century, mometasone has become a cornerstone in the management of allergic rhinitis, asthma, and various dermatological disorders. Its favorable safety profile, when used appropriately, has made it a preferred choice among clinicians and patients alike. This report provides a brief but comprehensive review of mometasone, covering its pharmacology, clinical indications, efficacy, adverse effects, and practical considerations.

Pharmacology and Mechanism of Action

Mometasone exerts its effects primarily through binding to the glucocorticoid receptor (GR) in the cytoplasm of target cells. The mometasone-GR complex then translocates to the nucleus, where it modulates gene transcription. This results in increased synthesis of anti-inflammatory proteins (e.g., lipocortin-1, which inhibits phospholipase A2) and decreased production of pro-inflammatory mediators such as cytokines, prostaglandins, and leukotrienes. By suppressing the activity of immune cells (mast cells, eosinophils, lymphocytes, macrophages), mometasone reduces inflammation, edema, and tissue remodeling. Compared to other corticosteroids, mometasone has high receptor affinity and low systemic bioavailability when administered topically or intranasally, which enhances its local therapeutic effect while minimizing systemic side effects.

Formulations and Clinical Uses

1. Topical (Dermatological): Mometasone furoate cream, ointment, and lotion are used for inflammatory skin conditions such as atopic dermatitis, psoriasis, contact dermatitis, and eczema. It is classified as a medium-potency corticosteroid, effective for mild to moderate cases. Typically applied once daily due to its long duration of action, it reduces itching, redness, and scaling. In children, short-term use is recommended under medical supervision because of the risk of skin atrophy and systemic absorption.
2. Intranasal (Allergic Rhinitis): Mometasone furoate nasal spray is a first-line therapy for seasonal and perennial allergic rhinitis in both adults and children aged 2 years and older. It alleviates sneezing, congestion, rhinorrhea, and nasal itching. Onset of action occurs within 12 hours, but maximal benefit may take several days. It is also used as adjunctive therapy for nasal polyps. The typical dose is 2 sprays per nostril once daily, and it is well-tolerated with minimal systemic absorption.
3. Inhaled (Asthma and COPD): Mometasone furoate administered via dry powder inhaler (DPI) or metered-dose inhaler (MDI) is indicated for maintenance treatment of asthma in patients aged 4 years and older. It reduces airway inflammation, improves lung function, and decreases exacerbations. For chronic obstructive pulmonary disease (COPD), it is often combined with a long-acting beta-agonist (e.g., formoterol) in a single inhaler. The usual dose depends on disease severity, ranging from 100 to 800 mcg daily. Inhaled mometasone has lower oral bioavailability than older corticosteroids, reducing the risk of systemic effects.

Efficacy and Clinical Evidence

Numerous studies and meta-analyses support the efficacy of mometasone across its indications. In allergic rhinitis, intranasal mometasone is comparable or superior to other intranasal corticosteroids and antihistamines. For asthma, inhaled mometasone significantly improves peak expiratory flow, reduces rescue medication use, and decreases exacerbation rates. Topical mometasone has been shown to be as effective as betamethasone valerate in treating psoriasis and atopic dermatitis, with a lower risk of skin thinning. The drug’s once-daily dosing enhances patient adherence, a critical factor in chronic disease management.

Side Effects and Safety

Adverse effects depend on the route of administration. Topical use may cause local reactions: burning, stinging, dryness, folliculitis, hypopigmentation, and skin atrophy with prolonged use. When applied to large areas or under occlusion, systemic absorption can lead to hypothalamic-pituitary-adrenal (HPA) axis suppression, especially in children. Intranasal mometasone can cause epistaxis, nasal crusting, mild irritation, or headache. Rarely, perforation of the nasal septum has been reported. Inhaled mometasone may cause oropharyngeal candidiasis, dysphonia, and cough; rinsing the mouth after use reduces these risks. Systemic effects with inhaled therapy are uncommon at typical doses but include adrenal suppression, growth retardation in children, cataracts, glaucoma, and osteoporosis with long-term high-dose use. As with all corticosteroids, abrupt discontinuation after prolonged therapy can precipitate adrenal insufficiency, so tapering is advised.

Precautions and Contraindications

Mometasone formulations should be avoided in patients with known hypersensitivity to any component. Topical preparations should not be used on untreated infections (viral, bacterial, fungal). Intranasal sprays require caution in patients with recent nasal surgery, trauma, or ulcers. Inhaled mometasone is not indicated for acute asthma attacks; a short-acting bronchodilator should be used for rescue. During pregnancy, mometasone is categorized as category C (topical) or category B (intranasal/inhaled) by some regulatory bodies; use only if potential benefit outweighs risk. Breastfeeding mothers should apply minimal amounts if using topical forms and avoid application to the breast area.

Conclusion

Mometasone is a versatile and effective corticosteroid that plays a crucial role in managing numerous inflammatory conditions. Its favorable pharmacokinetic profile, including high potency with low systemic bioavailability, allows for safe long-term use when administered as recommended. Clinicians must remain mindful of potential local and systemic adverse effects and tailor the choice of formulation, dose, and duration to each patient’s specific needs. Ongoing research continues to explore new indications and delivery systems, ensuring that mometasone remains an essential tool in modern therapeutics.