Metrogel

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Metrogel on Prescriptsy

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Metrogel is a topical gel containing metronidazole 0.75%, prescribed for the treatment of the inflammatory papules, pustules, and persistent erythema associated with rosacea.

It is one of the most commonly prescribed topical treatments for rosacea in the United Kingdom and has been a cornerstone of rosacea management for over three decades.

Metrogel is applied directly to the affected skin of the face once or twice daily. It is a prescription-only medicine (POM) and is available through the NHS.

Rosacea is a chronic, relapsing inflammatory skin condition that predominantly affects the central face (cheeks, nose, chin, and forehead).

It is estimated to affect up to 10% of the population in northern European countries, with fair-skinned individuals at highest risk.

Rosacea causes visible redness (erythema), flushing episodes, small bumps (papules), pus-filled spots (pustules), and, in some cases, visible blood vessels (telangiectasia) and thickening of the skin (phymatous changes).

The condition significantly affects quality of life, causing embarrassment, self-consciousness, and in some cases anxiety and depression.

This page provides a comprehensive clinical overview of Metrogel, including how it works, how to use it, what to expect during treatment, side effects, safety information, and how to manage rosacea alongside treatment in the United Kingdom.

Important safety information about Metrogel

• Metrogel is for external use on the face only. Avoid contact with the eyes, mouth, and mucous membranes.
• Improvement may take 3 to 4 weeks to become noticeable, with full benefit at 8 to 12 weeks. Do not stop treatment prematurely.
• Use sun protection (SPF 30 or higher) daily, as sun exposure is a major rosacea trigger.
• Metrogel treats the inflammatory signs of rosacea (papules, pustules, redness) but does not cure the underlying condition.
• If the condition worsens or does not improve after 8 to 12 weeks, consult your prescriber for a treatment review.

Understanding rosacea

Rosacea is a complex chronic inflammatory condition of the facial skin.

The precise cause is not fully understood, but current evidence points to a combination of genetic predisposition, dysregulation of the innate immune system, neurovascular dysfunction, and environmental triggers.

The innate immune peptide cathelicidin (LL-37) is found at elevated levels in rosacea-affected skin and is thought to play a central role in driving the inflammatory response.

The Demodex folliculorum mite, a microscopic organism that lives in human hair follicles, is found in greater numbers on rosacea-affected skin and may contribute to inflammation through immune activation.

Rosacea is classified into several subtypes, though many patients have overlapping features. Erythematotelangiectatic rosacea (ETR) is characterised by persistent central facial redness, flushing, and visible blood vessels.

Papulopustular rosacea involves papules and pustules overlying persistent redness, resembling acne but without comedones (blackheads and whiteheads). Phymatous rosacea involves skin thickening, most commonly affecting the nose (rhinophyma).

Ocular rosacea affects the eyes, causing dryness, grittiness, blepharitis, and conjunctivitis. Metrogel is primarily used for papulopustular rosacea, targeting the inflammatory component.

How Metrogel works: mechanism of action

Metronidazole, the active ingredient in Metrogel, is a nitroimidazole antimicrobial agent.

However, when used topically for rosacea, its therapeutic benefit is thought to arise primarily from anti-inflammatory and antioxidant mechanisms rather than direct antimicrobial activity.

The proposed mechanisms include scavenging of reactive oxygen species (ROS) and free radicals produced by activated neutrophils at sites of inflammation, inhibition of neutrophil-mediated oxidative tissue damage, modulation of cell-mediated immune responses, and possible suppression of inflammatory cytokine production.

The exact mechanism by which topical metronidazole improves rosacea remains incompletely understood, which is common for many dermatological treatments.

What is well established from clinical trials is that topical metronidazole 0.75% significantly reduces the number of inflammatory papules and pustules and the degree of erythema compared with vehicle (placebo gel) over 8 to 12 weeks of treatment.

Clinical evidence for Metrogel in rosacea

Topical metronidazole has been studied in multiple randomised controlled trials for rosacea.

A Cochrane review of topical treatments for rosacea found moderate-quality evidence supporting the efficacy of topical metronidazole 0.75% in reducing papules, pustules, and erythema compared with placebo.

The effect size is modest but clinically meaningful, with most trials reporting a 40 to 60% reduction in inflammatory lesion counts over 8 to 12 weeks.

Head-to-head comparisons with other topical rosacea treatments show that topical metronidazole is broadly similar in efficacy to topical azelaic acid 15% (Finacea).

Topical ivermectin 1% (Soolantra) has been shown in some trials to be more effective than topical metronidazole at reducing inflammatory lesion counts, possibly due to its additional anti-Demodex activity.

However, metronidazole remains widely used as a first-line option due to its established safety profile, low cost, and familiarity among prescribers.

Metrogel compared with other rosacea treatments

Several topical and oral treatments are available for rosacea in the UK, and treatment is often tailored to the predominant subtype and severity.

Topical metronidazole 0.75% (Metrogel, Rozex) is a first-line option for mild to moderate papulopustular rosacea.

Topical azelaic acid 15% (Finacea) is an alternative first-line topical treatment with anti-inflammatory and mild antikeratinising properties.

Topical ivermectin 1% (Soolantra) is an antiparasitic agent that targets Demodex mites and has demonstrated superiority to topical metronidazole in some trials.

Topical brimonidine 0.33% (Mirvaso) is an alpha-2 adrenergic agonist used specifically for the persistent erythema of rosacea, but it does not treat papules or pustules and has been associated with rebound erythema in some patients.

For moderate to severe papulopustular rosacea, oral antibiotics may be added.

Doxycycline at a sub-antimicrobial dose (40 mg modified-release, marketed as Efracea) is the preferred oral option, as it provides anti-inflammatory benefit without contributing to antibiotic resistance.

Lymecycline, oxytetracycline, and erythromycin are alternatives. Oral isotretinoin may be considered for severe refractory rosacea under dermatologist supervision.

How to use Metrogel

Cleanse the face with a gentle, fragrance-free, non-foaming cleanser and pat dry.

Apply a pea-sized amount of Metrogel to the affected areas of the face, spreading it evenly in a thin layer.

Allow the gel to dry for a few minutes before applying any moisturiser, sunscreen, or cosmetics. Use once or twice daily as directed by your prescriber.

Continue treatment for the full course (typically 8 to 12 weeks) even if you notice improvement earlier, as stopping too soon may allow symptoms to return.

Avoid contact with the eyes, mouth, nostrils, and any broken or irritated skin. If the gel enters the eyes, rinse thoroughly with cool water.

If significant skin irritation develops (burning, stinging, excessive dryness), try reducing the frequency to once daily. If irritation persists, stop treatment and consult your prescriber.

Skin care advice for rosacea

Effective rosacea management extends beyond prescription treatment. Identifying and avoiding personal triggers is essential.

Common triggers include sun exposure (the single most commonly reported trigger), temperature extremes (hot or cold weather, wind), hot drinks, spicy food, alcohol, stress, and certain skin care products.

Keeping a trigger diary can help identify patterns.

Use a gentle, fragrance-free cleanser (avoid soap, alcohol-based toners, and exfoliating scrubs). Apply a non-comedogenic, fragrance-free moisturiser daily to maintain the skin barrier.

Use a broad-spectrum sunscreen with SPF 30 or higher every day, even on overcast days.

Mineral (physical) sunscreens containing zinc oxide or titanium dioxide are often better tolerated than chemical sunscreens. Choose make-up and skin care products labelled for sensitive skin.

Avoid products containing alcohol, menthol, camphor, witch hazel, and sodium lauryl sulfate.

Side effects of Metrogel

Common side effects

Local skin reactions are the most frequently reported side effects. Dryness, mild stinging or burning on application, itching, and transient redness affect a small proportion of patients.

These effects are generally mild and often settle within the first week or two of treatment.

Skin peeling or flaking may occur, particularly in patients with a compromised skin barrier. Applying a suitable moisturiser after the gel has dried can help.

Uncommon side effects

Contact dermatitis is a rare allergic reaction to metronidazole or a gel excipient. Symptoms include new or worsening redness, swelling, blistering, or intense itching at the application site.

Stop treatment and consult your prescriber. Eye irritation may occur if the gel migrates towards the eyes.

A metallic taste in the mouth is occasionally reported, attributable to trace systemic absorption.

Systemic side effects

Systemic side effects are extremely unlikely because topical application results in serum metronidazole concentrations that are less than 1% of those achieved with standard oral doses.

Nausea, headache, and peripheral neuropathy, which are recognised side effects of oral metronidazole, have not been convincingly demonstrated with topical use.

When to seek medical advice

Contact your GP if the condition worsens during treatment, if you develop signs of allergic contact dermatitis, if symptoms persist after 8 to 12 weeks of treatment, or if you notice new or unusual changes on your skin.

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

Warnings and precautions

Contraindications

Metrogel is contraindicated in patients with known hypersensitivity to metronidazole or any excipient in the formulation. Cross-sensitivity with other nitroimidazole agents may occur.

Correct diagnosis

Rosacea can be confused with acne, perioral dermatitis, seborrhoeic dermatitis, lupus, and contact dermatitis. An accurate diagnosis is essential before starting treatment. If the condition does not respond to Metrogel after a full course, the diagnosis should be reconsidered.

Sun protection

Sun exposure is the most commonly reported trigger for rosacea flares. Daily broad-spectrum sun protection (SPF 30 or higher) is strongly recommended during and after treatment with Metrogel.

Pregnancy and breastfeeding

There are limited data on the use of topical metronidazole in pregnancy. Systemic absorption is minimal, and the risk to the fetus is considered low.

However, use during pregnancy should be based on a prescriber's assessment that the benefit outweighs any theoretical risk.

During breastfeeding, avoid applying the gel to the breast area and wash hands thoroughly before handling the infant.

How to get Metrogel in the UK

Metrogel is a prescription-only medicine. You can obtain a prescription from your GP, a dermatologist, or an authorised online prescriber registered with the General Pharmaceutical Council (GPhC).

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

Sources

• Metrogel 0.75% Gel, Summary of Product Characteristics (EMC)
• Metronidazole, British National Formulary (BNF)
• NICE CKS: Rosacea
• Rosacea, NHS
• MHRA Yellow Card Scheme