Fungal nail infection — medically termed onychomycosis — is one of the most common nail disorders, affecting an estimated 10% of the adult population in the UK. It is more prevalent with age, with rates rising to approximately 20% in adults over 60. The condition is slow to develop, slow to treat and frequently undertreated because patients either accept it as cosmetic or underestimate the duration of effective therapy.

Community pharmacists are well placed to initiate treatment for mild to moderate cases and to set realistic expectations about the timeline.

Recognising fungal nail infection

The typical presentation involves one or more of the following changes, usually starting at the tip or side of the nail:

• Discolouration: white, yellow or brown patches on the nail
• Thickening: the nail becomes noticeably thicker and harder to cut
• Brittleness: the nail crumbles or breaks easily at the edges
• Distortion: the nail may become misshapen
• Separation: the nail lifts away from the nail bed (onycholysis)
• Debris: chalky, crumbly material accumulates under the nail

Toenails are affected approximately four times more frequently than fingernails, with the big toe being the most common site. Contributing factors include warm, moist environments (e.g. trainers, swimming pools), peripheral vascular disease, diabetes, immunosuppression and pre-existing nail trauma.

Pharmacy treatment: amorolfine nail lacquer

The first-line OTC treatment for mild fungal nail infection is amorolfine 5% nail lacquer (branded as Curanail, Loceryl or generic equivalents). Amorolfine is an antifungal that penetrates the nail plate to reach the fungal infection underneath.

How to use it

1. File down the affected part of the nail with the file provided in the pack — this removes as much infected nail as possible and improves lacquer penetration
2. Clean the nail surface with the swab provided (or an alcohol wipe) to remove grease and residual nail dust
3. Apply a thin layer of amorolfine lacquer to the entire surface of the affected nail
4. Allow to dry (approximately three to five minutes)
5. Repeat once or twice weekly as directed by the specific product

Treatment duration

This is where patient counselling is critical: toenail infections require 9–12 months of continuous treatment. Fingernail infections may clear in 6 months. The nail must grow out completely and be replaced by healthy nail before the infection can be considered cured. Patients who expect results in weeks will abandon treatment prematurely.

The pharmacist should explain that the lacquer prevents the fungus from spreading in newly growing nail, but the existing damaged nail will only disappear as it grows out. Toenails grow at approximately 1.5 mm per month — so a big toenail takes about a year to replace entirely.

Who amorolfine works for

Amorolfine is effective for mild to moderate infections where:

• Fewer than two nails are affected
• Less than 50% of the nail plate is involved
• The nail matrix (the base where the nail grows from) is not affected
• The nail is not excessively thickened

If these criteria are not met, OTC treatment alone is unlikely to succeed and GP referral is appropriate.

Other pharmacy options

Terbinafine cream: While effective for fungal skin infections (athlete's foot), topical terbinafine does not penetrate the nail plate adequately to treat onychomycosis. The pharmacist should clarify that the cream is for surrounding skin infection only, not for the nail itself.

Tea tree oil: Frequently requested by patients. Tea tree oil (melaleuca alternifolia) has in-vitro antifungal activity, but clinical trial evidence for onychomycosis is limited and of low quality. It may have a role as an adjunct to amorolfine for patients who wish to use it, but should not be recommended as a standalone treatment.

Nail softening agents: Urea-based nail softeners (e.g. Canespro Fungal Nail Treatment Set, which contains 40% urea paste) can be used to soften and remove the infected nail over two to three weeks before applying an antifungal lacquer. This approach improves lacquer penetration for thickened nails.

When to refer to the GP

The pharmacist should refer the patient if:

• More than two nails are affected, or more than 50% of any single nail is involved — oral antifungal treatment (terbinafine tablets, typically 250 mg daily for 3–6 months) is more effective for extensive infection
• The nail matrix is involved (visible as proximal disease near the cuticle) — topical treatment is unlikely to reach the infection source
• The patient has diabetes or peripheral vascular disease — nail infections in these patients carry a higher risk of secondary bacterial infection and should be managed under medical supervision
• The patient is immunosuppressed — antifungal treatment may need to be more aggressive
• OTC treatment has been used correctly for the full recommended duration without improvement
• The nail appearance is unusual — some conditions mimic fungal nail infection, including psoriasis, lichen planus, trauma and melanoma. A nail that has a dark streak (melanonychia) should be referred promptly for dermatological assessment

Prevention advice

The pharmacist can advise on reducing reinfection risk:

• Keep feet clean and dry; change socks daily
• Wear breathable footwear; avoid trainers for extended periods
• Treat athlete's foot promptly — fungal skin infection is the most common source of nail infection
• Do not share nail clippers, towels or shoes
• Wear flip-flops in communal showers, pools and changing rooms
• Rotate shoes to allow them to dry out between wears

The conversation that matters most

The most valuable thing the pharmacist can do for a patient with fungal nail infection is set expectations. The condition took months to develop, and it will take months to treat. Weekly application of amorolfine lacquer for 9–12 months, with diligent filing and cleaning, gives the best chance of clearance for mild to moderate disease. Patients who understand the timeline are far more likely to complete the course.

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