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Clotrimazole

Clotrimazole

The topical antifungal, and the safe choice in pregnancy. The combined steroid version needs more care than its packaging suggests.

Infection

Canesten, antifungal cream, pessary

Explained by a GMC-registered GP, not a leaflet

Honest about what we can and cannot prescribe remotely

Side effects given the same weight as benefits

Your NHS records in the room, with your consent

Clinically reviewed by Dr Mohammad Khan · Last reviewed

August 30, 2026

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What it is

Clotrimazole is an imidazole antifungal applied to the skin or used as a vaginal pessary. It disrupts the fungal cell membrane, killing the organism.

Because it acts locally with minimal absorption, it is the antifungal of choice in pregnancy, where the oral alternative is avoided.

It is also active against some bacteria, which occasionally helps in mixed skin infections.

What it is used for

  • Vaginal thrush — pessary, internal cream, or external cream
  • Thrush affecting the penis
  • Athlete's foot, jock itch and ringworm
  • Fungal infection in skin folds — under the breasts, in the groin, between toes
  • Fungal nappy rash
  • Oral thrush, as a related preparation

How to take it

Skin

  • Apply thinly two to three times daily
  • Continue for two weeks after the rash has cleared. This is the instruction people skip, and it is the commonest reason fungal rashes come straight back
  • Athlete's foot usually needs four weeks in total

Vaginal thrush

  • A 500mg pessary as a single dose, or lower-strength pessaries over three or six nights
  • Insert at night, lying down, so it stays in place
  • Add external cream for vulval itching — the pessary alone does not treat the outside skin

Clotrimazole damages latex condoms and diaphragms, so additional contraception is needed during treatment and for a few days afterwards.

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Side effects

  • Local burning, stinging or irritation on application — common in the first days, and usually settles
  • Redness at the site
  • Contact dermatitis, occasionally — sometimes to the cream base rather than the drug

Systemic side effects are essentially absent, because very little is absorbed.

Irritation that worsens rather than settles may mean sensitivity to the preparation itself — worth switching rather than persevering.

Not suitable if

  • You have had a reaction to clotrimazole or a similar antifungal

There are very few restrictions — which is precisely why it is the pregnancy and breastfeeding choice.

In pregnancy, use an applicator carefully or insert the pessary by hand, and mention it when buying.

Interactions and monitoring

No systemic interactions and no monitoring required.

The one practical interaction is physical: it weakens latex condoms and diaphragms.

A rash still present after four weeks of correct treatment should be reassessed rather than re-treated. A skin scraping can confirm whether it is fungal at all.

Can we prescribe this?

Clotrimazole is available from any pharmacy and supermarket, so a prescription is rarely needed and we will usually say so.

What is worth a consultation is a rash that has not responded to it. That is common, and the usual reasons are informative:

  • It is not fungal at all — eczema, psoriasis and other conditions are regularly treated as fungal for months
  • A combined steroid-antifungal cream has been used, partially suppressing it and changing its appearance
  • It needs oral rather than topical treatment, as scalp and nail infections do

Photographs help considerably here, and a rash treated unsuccessfully for weeks deserves a proper look rather than another tube.

Cost and supply

Widely available from pharmacies and supermarkets without prescription, and inexpensive. Own-brand versions are identical to branded ones and cost considerably less.

Combination packs — pessary plus external cream — cost more but treat both the inside and outside, which is usually what is needed.

Combined antifungal and steroid creams are also sold over the counter, and are frequently the wrong choice — see below.

Stopping or switching

Keep going for two weeks after the skin looks clear. Stopping when it looks better is why fungal rashes recur.

The combined steroid problem

Creams combining an antifungal with a steroid are widely sold and widely misused. The steroid settles the itch quickly, which feels like success — but it also suppresses the immune response locally, so the fungus spreads while the appearance improves.

The result is tinea incognito — a fungal infection altered beyond recognition, harder to diagnose and harder to treat. Short courses only, and not on the face or in skin folds without advice.

Alternatives

  • Terbinafine cream — often more effective for athlete's foot and ringworm, and needs a shorter course
  • Miconazole — similar, and useful for oral thrush as a gel
  • Oral fluconazole or terbinafine — required for scalp and nail infections, which topical treatment cannot reach

Common questions

Cream or pessary for thrush?

Both, ideally. The pessary treats inside, the cream treats the external itching. Combination packs exist for this reason.

Will it affect my condom?

Yes — it damages latex. Use additional contraception during treatment and for a few days after.

Can I use it in pregnancy?

Yes, and it is the recommended choice, since oral fluconazole is avoided. Insert pessaries carefully, ideally by hand.

My rash keeps coming back.

Usually because treatment stopped too early. Continue two weeks past clearance. If it truly persists, it may not be fungal — or a steroid-containing cream may be altering it.

Why not just use the one with hydrocortisone in it?

Because the steroid can let the fungus spread while making the rash look better. It has a place for very itchy rashes short term, but it is not the default and it should not be used for weeks.

It stings when I apply it.

Mild stinging is common early and settles. Worsening irritation suggests sensitivity to the preparation — switch rather than persist.

Dr Mohammad Zubair Khan, GMC-registered private GP and founder of Cheshire Clinics

Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469

Last reviewed

August 30, 2026

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