Mometasone: Uses, Side Effects, Precautions and Dosage
Mometasone
About Mometasone
Mometasone furoate is a medium to high potency synthetic corticosteroid available as a nasal spray, topical cream and ointment, an inhaler, and ear drops. The topical cream and ointment are Class II (potent) corticosteroids; the nasal spray acts locally with negligible systemic absorption. Mometasone is rapidly inactivated once it leaves its site of action, limiting systemic side effects.
How Does Mometasone Work?
Mometasone binds to glucocorticoid receptors inside cells, blocking pro-inflammatory proteins (prostaglandins, leukotrienes, cytokines) and activating anti inflammatory proteins. In the nasal passages, this suppresses the allergic response. On the skin, it reduces the inflammation driving eczema, psoriasis and contact dermatitis. In the airways, it reduces chronic airway inflammation, improving airflow.
Uses of Mometasone
Doctors use mometasone for:
Allergic rhinitis (hay fever): One of the most effective treatments for nasal congestion, runny nose, sneezing, and itching from seasonal or year-round allergies
Nasal polyps: Nasal spray shrinks polyps, relieving blockage and loss of smell
Asthma: Inhaler used as a daily maintenance (treatment, not for acute attacks
Eczema (atopic dermatitis): Cream or ointment reduces itching and inflammation
Psoriasis: Reduces scaling and thickening of plaques
Seborrhoeic dermatitis: Reduces scalp inflammation and flaking
Contact dermatitis: Relieves inflammation and itching
How and When to Use Mometasone
Nasal spray: Two sprays per nostril once daily for adults; shake before use, blow the nose first, and spray while breathing in gently. Avoid the nasal septum (the wall dividing the nostrils). Full effect builds over days to weeks so daily use is essential.
Topical cream: A thin layer to affected areas once daily; do not apply under occlusion unless directed; wash hands after.
Inhaler: Once daily; rinse the mouth and spit after every use to prevent oral thrush.
Side Effects of Mometasone
Nasal spray: Nosebleeds (epistaxis), nasal dryness, headache, and throat irritation.
Topical cream (prolonged use): Skin thinning, stretch marks, telangiectasia (visible surface blood vessels), patchy skin lightening, acneiform eruptions, and hypertrichosis (increased hair growth).
Inhaler: Oral candidiasis and hoarseness.
Systemic effects are uncommon; with very large areas, prolonged use, or high doses, HPA axis suppression, cataracts, and glaucoma are possible.
Can I Use Mometasone Daily?
Daily use is expected for the nasal spray (continued throughout the allergy season or year-round) and inhaler (as long as asthma control requires). For the topical cream, 3 to 4 week courses are appropriate. Beyond 4 weeks, skin thinning risk rises. A step-down to a lower-potency steroid or non-steroidal alternative suits long-term maintenance.
Precautions While Using Mometasone
Avoid topical use on the face, groin, or armpits without a dermatologist's direction
Do not apply to infected skin
In nasal spray avoid directing the spray at the nasal septum; prolonged impact can rarely cause perforation
Avoid in children under 2 years and use with caution in children under 12
In pregnancy nasal spray is considered safe for seasonal allergy and a topical cream requires a risk-benefit assessment
Do not stop the inhaler abruptly - taper to avoid adrenal insufficiency or asthma rebound
Avoid eye contact and rinse immediately if contact occurs as prolonged exposure risks glaucoma and cataracts.
What If You Missed an Application or Dose?
Nasal spray or inhaler: take the missed dose the same day; if not until the next day, skip it. Do not double up as missing occasional doses reduces long-term control without causing an acute crisis.
Topical cream: apply as soon as you remember; if nearly time for the next application, skip it.
What If You Use Too Much?
A single excess application is unlikely to cause serious harm. Chronic overuse (more than recommended, large areas, or under occlusion) raises systemic absorption and HPA axis suppression risk. Signs of excess include weight gain, a rounded face, easy bruising and stretch marks need urgent review. If a child ingests any formulation, contact a doctor immediately.
Caution With Other Drugs: Interactions
Key interactions are:
Strong CYP3A4 inhibitors like ketoconazole, itraconazole, ritonavir, clarithromycin
Other corticosteroids
Topical calcineurin inhibitors like tacrolimus, pimecrolimus
Occlusive dressings or emollients should be applied simultaneously as they significantly increase absorption; apply emollients 30 minutes before or after the steroid.
Dosage for Mometasone
Allergic rhinitis (adults and children over 12): 2 sprays per nostril once daily
Allergic rhinitis (children 2-11): 1 spray per nostril once daily
Nasal polyps: 2 sprays per nostril twice daily initially; once daily for maintenance
Asthma inhaler: 200-400 mcg once daily, adjusted by the specialist
Topical cream 0.1%: Thin layer once daily; courses not to exceed 3-4 weeks
Not recommended under 2 years. All paediatric doses are guided by weight and clinical response.
Mometasone vs Fluticasone
Both are synthetic corticosteroids. Key differences:
Potency: Mometasone 200 mcg daily and fluticasone propionate 200 mcg daily are broadly equivalent for nasal symptoms; both topical agents are Class II in potency
Systemic absorption: Mometasone nasal spray bioavailability is the lowest of any nasal steroid; fluticasone propionate is also very low
Inhaler combinations: Common combinations include fluticasone with salmeterol and mometasone with formoterol. Both are maintenance-only - neither is a rescue inhaler
Both are first-line options; selection depends on formulation, patient age, and prescriber preference.
FAQs
What is mometasone used for?
Mometasone treats: allergic rhinitis and nasal polyps (nasal spray); asthma (daily maintenance inhaler); eczema, psoriasis, seborrhoeic dermatitis, and contact dermatitis (topical cream and ointment); and otitis externa (ear drops).
What are the side effects of mometasone cream?
With short courses and correct use, side effects are uncommon. Prolonged use causes skin thinning, stretch marks (striae), telangiectasia, patchy skin lightening, increased hair growth, and acneiform eruptions. Systemic effects are rare because mometasone is rapidly inactivated.
Is mometasone a steroid medication?
Yes mometasone furoate is a synthetic corticosteroid of the same class as cortisol (the body's own steroid), but many times more potent as an anti-inflammatory. Use the minimum effective dose for the shortest necessary period.
Can mometasone treat allergies or skin rashes?
Yes to both. The nasal spray is one of the most effective treatments for allergic rhinitis reducing congestion, runny nose, and sneezing from pollen, dust mites, or other allergens. The cream and ointment treat allergic contact dermatitis and eczema. Mometasone controls the inflammatory response; it does not cure allergies.
How often should mometasone be applied?
Nasal spray: once daily (two sprays per nostril for adults; one for children aged 2-11).
Topical cream: once daily.
Inhaler: once daily.
The same time each day builds consistent drug levels.
Can mometasone be used on the face?
The nasal spray is designed for inside the nose. For the cream: facial use requires a dermatologist's direction for the shortest possible time. Facial skin absorbs more drug, making skin thinning, telangiectasia, perioral dermatitis, and acneiform eruptions more likely.
Is mometasone safe for children?
Nasal spray: approved from age 2 (one spray per nostril daily).
Topical cream: used with caution from age 2 and not used under 2 years. Children absorb more drug proportionally; growth suppression is a risk. A specialist prescribes inhaler dosing.
How long should mometasone cream be used?
Most dermatologists recommend limiting courses to 3-4 weeks for body skin and less for facial or flexural areas. Beyond 4 weeks, cumulative skin thinning and systemic absorption risk increase.
Can mometasone cause skin thinning?
Yes skin thinning (cutaneous atrophy) is the most significant local side effect, making skin fragile and prone to stretch marks. Thin-skinned areas like the face, groin, and armpits are most vulnerable. It is largely preventable by using the minimum effective amount for the shortest possible time and avoiding facial use without specialist direction.
What precautions should be taken while using mometasone?
Avoid topical use on the face, groin, or armpits without specialist direction. Do not apply to infected skin. For the nasal spray, avoid directing at the septum. Rinse the mouth after every inhaler use. Taper the inhaler - do not stop abruptly. Keep all formulations away from the eyes.
