Topical metronidazole for rosacea

By Dr Magnus Lynch
MA(Cantab) DPhil(Oxon) MRCS FRCP
Consultant Dermatologist & Dermatological Surgeon

Metronidazole is one of the most frequently used topical treatments for rosacea. It helps reduce inflammation, papules and pustules, and can calm background redness in some people.

When should I use topical metronidazole?

I advise applying at night before bed. Do not apply at the same time as other active ingredients

How long should I use it?

Onset: If it is effective, you should expect to see a noticeable improvement in 4–8 weeks; maximal benefit can take up to 12 weeks.
Maintenance: Many patients continue once-daily maintenance long-term to keep inflammation controlled. Others step down to a few times per week once stable.
When to stop: If you’re consistently clear for several months, you can trial a gradual reduction. If flares recur, restart regular use and/or add in other treatments.

What should I do if metronidazole stops working after a few months?

Rosacea is chronic and can fluctuate. If benefit wears off or flares break through:

Repair skin barrier: Use a bland, fragrance-free moisturiser such as Cetaphil or Cerave to help the skin barrier to heal.
Switch or add another topical: Options include ivermectin (often very effective for inflammatory lesions) or azelaic acid. These can be rotated or combined.
Consider oral therapy for flares: A 6-12 week course of an antibiotic such as doxycycline can be very effective for settling flares.
For persistent redness/visible vessels: Topicals help less with fixed redness and telangiectasia; vascular laser or IPL is often required.
Re-evaluate the diagnosis: If there’s no response at all, consider alternatives such as periorificial dermatitis, seborrhoeic dermatitis or acne - all of which can co-exist with rosacea.

What if topical metronidazole doesn't work?

Topical metronidazole is often prescribed as a first line treatment but is not always effective and if things don't improve you can switch to or combine with other options such as topical ivermectin (Soolantra) or azelaic acid.

Is gel or cream better?

Gel tends to suit oilier or combination skin; cream/lotion can be more comfortable for dry or sensitive skin.

Can I use it with azelaic acid, niacinamide or ivermectin?

Yes. A common plan is metronidazole in the morning and azelaic acid or ivermectin at night. Niacinamide may help the skin barrier.

How to combine with moisturiser or sunscreen?

After cleansing, apply metronidazole first, allow it to absorb for a minute or two, then moisturiser. In the morning finish with a broad-spectrum SPF 30–50. If stinging occurs, try moisturiser first, then metronidazole.

Is it safe in pregnancy or breastfeeding?

Metronidazole is generally considered safe in pregnancy and breastfeeding.

What if my main issue is persistent redness rather than spots?

Metronidazole can help some background redness, but fixed redness and visible vessels respond best to vascular laser or IPL. Brimonidine or oxymetazoline creams can temporarily reduce redness in some patients but I do not recommend them due to the risk of rebound flares.

Dr. Magnus Lynch, Consultant Dermatologist

About Dr Magnus Lynch

I am a London-based Consultant Dermatologist and Dermatological Surgeon. I am highly experienced in skin cancer diagnosis, Mohs micrographic surgery, acne, rosacea, acne scarring and laser treatments. I studied at the Universities of Cambridge and Oxford, and completed my dermatology training and Mohs fellowship at the prestigious St John’s Institute of Dermatology. I graduated from medical school in 2003 and have worked exclusively in Dermatology since 2012.

I lead a research team at King’s College London investigating the molecular biology of skin cancer. In recent years I have been involved in Media Appearances, including the Channel 5 series 'Skin A&E', where I perform skin surgeries and treat various skin conditions. Filming for the next series has recently completed and the series will be released later in 2025.

My NHS practice is at Guy's Hospital. I consult with private patients at the London Bridge Hospital, OneWelbeck (near to Bond Street station) and on Harley Street. A new consultation is £250. Book A Consultation.

I am the founder of Revessa Health which provides online consultations for acne and rosacea across the UK (see below).