Metosyn

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Metosyn on Prescriptsy

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Metosyn is a topical corticosteroid preparation containing fluocinonide 0.05% as its active ingredient.

It is classified as a potent corticosteroid (Group III in the UK four-group potency system) and is used to treat inflammatory skin conditions that have not responded adequately to milder corticosteroid preparations.

Metosyn is available as a cream, an ointment, and a scalp application, allowing treatment to be tailored to the type and location of the skin condition.

It is a prescription-only medicine (POM) in the United Kingdom.

Inflammatory skin conditions such as eczema and psoriasis affect millions of people in the UK.

The National Eczema Society estimates that around 1 in 5 children and 1 in 10 adults in the UK have eczema at any given time.

Psoriasis affects approximately 1.8 million people. These conditions cause significant physical discomfort (itching, pain, skin cracking, bleeding) and considerable psychological distress (embarrassment, social avoidance, sleep disruption, anxiety, depression).

Topical corticosteroids have been the mainstay of anti-inflammatory treatment for skin disease since their introduction in the 1950s, and understanding how to use them safely and effectively is essential for good outcomes.

This page provides a comprehensive clinical overview of Metosyn, including how it works, when it is appropriate, how to apply it correctly, potential side effects, and important safety information for patients in the United Kingdom.

Important safety information about Metosyn

• Metosyn is a potent topical corticosteroid. Use it only on the affected areas, in the smallest amount that covers the condition, for the shortest time needed.
• Do not use Metosyn on the face, groin, or armpits unless specifically instructed by your prescriber.
• Do not use Metosyn on infected skin unless an antimicrobial is also being used.
• Prolonged or excessive use can cause skin thinning, stretch marks, and other local side effects. These risks increase with higher potency, longer duration, and application to thin-skinned areas.
• Continue to use emollients (moisturisers) as part of your skin care routine.

Understanding topical corticosteroid potency

In the UK, topical corticosteroids are classified into four potency groups: mild, moderate, potent, and very potent.

This classification helps prescribers match the strength of the preparation to the severity and location of the skin condition.

Mild corticosteroids (hydrocortisone 0.5% to 1%) are suitable for mild eczema, particularly on the face and in children.

Moderate corticosteroids (clobetasone butyrate 0.05%, marketed as Eumovate) are used for moderate eczema and for short-term use on the face.

Potent corticosteroids (fluocinonide 0.05%, betamethasone valerate 0.1%) are reserved for more severe or resistant disease on the body.

Very potent corticosteroids (clobetasol propionate 0.05%, marketed as Dermovate) are used for the most severe or refractory conditions under close supervision.

Metosyn, containing fluocinonide 0.05%, sits in the potent category. This means it is significantly stronger than hydrocortisone and Eumovate but less strong than Dermovate.

Potent corticosteroids are appropriate when milder preparations have failed to control a flare, when the affected skin is thick or lichenified (as in chronic eczema or palmoplantar psoriasis), or when a short, intensive course is needed to bring active inflammation under control before stepping down to a milder preparation.

How Metosyn works: mechanism of action

Fluocinonide, the active ingredient in Metosyn, is a synthetic fluorinated corticosteroid.

When applied to the skin, it penetrates the stratum corneum and enters epidermal and dermal cells, where it binds to intracellular glucocorticoid receptors.

The activated steroid-receptor complex translocates to the cell nucleus and modulates gene transcription, upregulating the production of anti-inflammatory proteins (lipocortins, which inhibit phospholipase A2) and downregulating the production of pro-inflammatory mediators (prostaglandins, leukotrienes, cytokines including interleukins 1, 2, and 6, and tumour necrosis factor alpha).

The clinical result is a reduction in redness (through vasoconstriction), swelling (through decreased capillary permeability), itching (through suppression of inflammatory mediators), and scaling (through modulation of epidermal cell turnover).

The fluorine atom in the fluocinonide molecule enhances lipophilicity and receptor binding affinity, contributing to its potent anti-inflammatory activity.

Conditions treated with Metosyn

Metosyn is indicated for the treatment of inflammatory skin conditions that are responsive to topical corticosteroids and have not responded adequately to milder preparations.

Common conditions include atopic eczema (atopic dermatitis) during acute flares, particularly when the skin is thickened, lichenified, or intensely itchy.

Psoriasis, especially plaque psoriasis on the body and limbs, where thick plaques may resist penetration by milder corticosteroids.

Contact dermatitis (allergic or irritant), once the causative agent has been identified and removed.

Discoid lupus erythematosus, seborrhoeic dermatitis of the scalp (using the scalp application), and lichen simplex chronicus (a condition of thickened, itchy skin caused by repeated scratching) are additional indications.

Choosing the right formulation: cream, ointment, or scalp application

The formulation affects both the efficacy and cosmetic acceptability of treatment. Metosyn cream contains fluocinonide 0.05% in a water-miscible base.

Creams are lighter, spread easily, and are preferred for moist, weeping, or exudative lesions, flexural areas (where ointments may be too occlusive), and cosmetically sensitive areas where a non-greasy finish is preferred.

However, creams may contain preservatives and stabilisers that can occasionally cause contact sensitivity.

Metosyn ointment contains fluocinonide 0.05% in a greasy base. Ointments provide greater occlusion, enhancing drug penetration into thickened or scaly skin.

They are preferred for dry, lichenified, or hyperkeratotic lesions.

Ointments also have an inherent emollient effect and typically contain fewer additives, making them less likely to cause contact sensitivity.

They are less cosmetically acceptable because of their greasy texture.

Metosyn scalp application is a solution-based formulation designed for the scalp, where creams and ointments are impractical because they do not spread easily through hair. It is used for scalp psoriasis, severe seborrhoeic dermatitis, and other inflammatory scalp conditions.

How to apply Metosyn correctly

Correct application technique maximises therapeutic benefit and minimises side effects. Wash and dry your hands before application. Apply a thin layer of Metosyn to the affected area only.

Use the fingertip unit (FTU) system to measure the correct amount. Rub in gently until the cream or ointment has been absorbed.

Wash your hands after application (unless your hands are the area being treated). Apply once or twice daily as directed by your prescriber.

Continue to use emollients (moisturisers) between corticosteroid applications.

Apply the emollient at least 15 to 30 minutes before or after Metosyn, or at a different time of day, so that the corticosteroid is not diluted or spread to unaffected skin.

The step-up, step-down approach

Dermatologists and GPs commonly use a step-up, step-down strategy for managing inflammatory skin conditions with topical corticosteroids.

During an acute flare, a potent corticosteroid like Metosyn is used for a short course (typically 1 to 2 weeks) to bring inflammation under control quickly.

Once the flare has settled, treatment is stepped down to a moderate or mild corticosteroid for maintenance, or the corticosteroid is stopped and emollient therapy alone is continued.

This approach aims to achieve rapid control while minimising cumulative corticosteroid exposure.

For chronic relapsing conditions such as eczema, a proactive maintenance strategy may be recommended.

This involves applying the potent corticosteroid to previously affected areas on 2 consecutive days per week ("weekend therapy") to prevent flares, while continuing daily emollient use.

This strategy has been shown to reduce the frequency and severity of flares compared with reactive treatment alone.

Side effects of Metosyn

Local side effects

Skin thinning (atrophy) is the most well-known risk of topical corticosteroid use.

It results from the suppression of collagen synthesis in the dermis and presents as thin, fragile, easily bruised skin with visible blood vessels (telangiectasia).

The risk is proportional to the potency of the corticosteroid, the duration of use, the site of application (face, flexures, and genitalia are most susceptible), and whether occlusion is used.

Striae (stretch marks), particularly in the groin, axillae, and inner thighs, may develop and are usually permanent.

Other local effects include perioral dermatitis, acneiform eruptions, steroid rosacea (if applied to the face), hypopigmentation (lightening of treated skin, especially in darker skin tones), hypertrichosis (increased hair growth at the application site), and allergic contact dermatitis to the corticosteroid or excipients.

Systemic side effects

Systemic absorption of topical corticosteroids is generally minimal when used correctly but can become clinically significant with prolonged use, potent or very potent preparations, large treatment areas, occlusive dressings, or application in infants and young children.

Potential systemic effects include HPA axis suppression, Cushing syndrome features (moon face, weight gain, striae), hyperglycaemia, osteoporosis, and growth retardation in children.

These effects are rare and are primarily a concern with chronic misuse.

When to seek medical advice

Contact your GP if the skin condition worsens despite treatment, if you notice signs of skin infection (increasing redness, swelling, pus, crusting), if stretch marks or visible blood vessels develop, or if you develop new symptoms around the mouth (perioral dermatitis).

Report suspected adverse reactions to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Contraindications

Metosyn must not be applied to untreated infected skin (bacterial, fungal, or viral infections including herpes simplex, chickenpox, shingles), rosacea, acne vulgaris, perioral dermatitis, or ulcerated skin. It is contraindicated in infants under 1 year.

Sensitive areas

The face, eyelids, genitalia, groin, and axillae have thinner skin that absorbs corticosteroids more readily. Potent corticosteroids like Metosyn are generally inappropriate for these areas.

If a corticosteroid is needed for facial eczema, a mild preparation (hydrocortisone 1%) is usually preferred.

Children

Children are more susceptible to systemic absorption and local side effects because of their higher body surface area to weight ratio.

Use in children should be supervised by a dermatologist or paediatrician. Treatment should be limited to the minimum effective potency and shortest possible duration.

Growth monitoring is advisable during prolonged treatment.

Pregnancy and breastfeeding

There are limited data on the use of potent topical corticosteroids during pregnancy.

Animal studies have shown teratogenic effects with systemic corticosteroids, but the risk from topical application is considered low provided application is limited in area, duration, and potency.

Avoid application to the breasts during breastfeeding. Discuss with your prescriber if you are pregnant, planning a pregnancy, or breastfeeding.

How to get Metosyn in the UK

Metosyn is a prescription-only medicine. You can obtain it from your GP, a dermatologist, or an authorised online prescriber registered with the GPhC.

The NHS prescription charge in England is 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Sources

• Metosyn Cream, Summary of Product Characteristics (EMC)
• Fluocinonide, British National Formulary (BNF)
• NICE CKS: Eczema, atopic
• Topical corticosteroids, NHS
• MHRA Yellow Card Scheme