Ketoconazole Shampoo

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Ketoconazole 2% shampoo is a medicated antifungal treatment used to manage seborrhoeic dermatitis, dandruff, and pityriasis versicolor affecting the scalp.

It contains ketoconazole, a broad-spectrum imidazole antifungal that targets the Malassezia yeasts implicated in these common scalp conditions.

Unlike oral ketoconazole, which carries significant systemic risks, ketoconazole shampoo acts topically with minimal absorption into the bloodstream, making it a safe and effective first-line treatment.

It is classified as a pharmacy medicine (P) in the United Kingdom, meaning it can be purchased from a pharmacy without a prescription, though it is also available on NHS prescription from your GP.

Dandruff and seborrhoeic dermatitis are among the most common dermatological conditions worldwide.

In the UK, dandruff affects an estimated 50% of the adult population at some point, while seborrhoeic dermatitis, a more inflammatory form of the same process, affects approximately 3 to 5% of adults.

Both conditions are driven by an abnormal inflammatory response to Malassezia species, lipophilic yeasts that colonise sebum-rich areas of the skin, particularly the scalp, face, and upper trunk.

Symptoms include flaking, itching, redness, and scaling that can be persistent, embarrassing, and difficult to control with ordinary shampoos.

This page provides a comprehensive clinical overview of ketoconazole 2% shampoo, covering how it works, how to use it, side effects, safety information, and where to obtain it in the United Kingdom.

Important information about ketoconazole shampoo

Before reading further, note these key points about ketoconazole 2% shampoo.

• Ketoconazole shampoo is a pharmacy medicine and can be purchased without a prescription from any UK pharmacy.
• It is for external use on the scalp and body only. Avoid contact with the eyes.
• For treatment, use twice weekly for 2 to 4 weeks. For prevention, use once every 1 to 2 weeks.
• Leave the shampoo on the scalp for at least 3 to 5 minutes before rinsing.
• If symptoms persist beyond 4 weeks despite treatment, consult your GP.
• Systemic side effects are not expected because topical absorption is minimal.

Understanding dandruff and seborrhoeic dermatitis

Dandruff (pityriasis capitis) and seborrhoeic dermatitis represent a spectrum of the same condition. Dandruff is the milder end, characterised by diffuse flaking of the scalp without significant inflammation.

Seborrhoeic dermatitis is more severe, with visible redness, greasy yellowish scales, and itching.

Both are driven by an interaction between Malassezia yeasts, sebum production, and the host immune response.

Malassezia species, particularly Malassezia globosa and Malassezia restricta, are commensal yeasts that live on the skin of virtually all adults.

They thrive in areas rich in sebaceous glands, feeding on lipids in sebum.

In susceptible individuals, the metabolic byproducts of Malassezia, particularly oleic acid and other unsaturated fatty acids produced by fungal lipases, penetrate the stratum corneum and trigger an inflammatory cascade.

This inflammation leads to increased epidermal turnover, producing the visible flakes of dandruff, along with itching and redness in more severe cases.

Several factors influence susceptibility to dandruff and seborrhoeic dermatitis.

Sebum production is androgen-dependent, which is why these conditions are most common after puberty, more prevalent in males, and can fluctuate with hormonal changes.

Stress, cold and dry weather, immune suppression (including HIV infection), neurological conditions (particularly Parkinson disease), and certain medications can all exacerbate the condition.

Genetic factors also play a role in individual susceptibility.

Pityriasis versicolor (tinea versicolor) is a related condition caused by Malassezia overgrowth on the trunk, arms, and sometimes scalp.

It presents as patches of skin that are lighter or darker than the surrounding area, often with fine scaling.

Ketoconazole shampoo is effective against this condition when used as a body wash.

How ketoconazole shampoo works: mechanism of action

Ketoconazole is an imidazole antifungal that inhibits the cytochrome P450 enzyme lanosterol 14-alpha-demethylase (CYP51). This enzyme is essential for converting lanosterol to ergosterol during fungal cell membrane synthesis.

Ergosterol is the principal sterol in fungal cell membranes, serving the same structural and functional role that cholesterol serves in mammalian cells.

By blocking ergosterol production, ketoconazole weakens the fungal cell membrane, increasing its permeability and leading to leakage of intracellular components and ultimately cell death.

In addition to its direct antifungal activity, ketoconazole has documented anti-inflammatory properties.

It inhibits the synthesis of thromboxane and leukotrienes via the 5-lipoxygenase pathway, reducing the inflammatory component of seborrhoeic dermatitis.

This dual action, antifungal and anti-inflammatory, distinguishes ketoconazole from simple cosmetic anti-dandruff agents such as zinc pyrithione or selenium sulfide, which also have antifungal activity but less potent anti-inflammatory effects.

When applied as a shampoo and left on the scalp for 3 to 5 minutes, ketoconazole penetrates the stratum corneum and acts directly on the Malassezia organisms.

Systemic absorption through intact skin is minimal, with plasma levels of ketoconazole remaining undetectable or far below therapeutic systemic concentrations.

This means that the serious side effects associated with oral ketoconazole (hepatotoxicity, adrenal suppression, drug interactions) do not apply to the shampoo formulation.

Clinical evidence for ketoconazole shampoo

Ketoconazole shampoo has been extensively studied in randomised controlled trials for both treatment and prevention of seborrhoeic dermatitis and dandruff.

A Cochrane review of topical antifungals for seborrhoeic dermatitis concluded that ketoconazole is effective in reducing scaling, itching, and the density of Malassezia organisms on the scalp.

Head-to-head comparisons have shown ketoconazole 2% shampoo to be at least as effective as topical corticosteroid preparations (such as hydrocortisone scalp lotion) for short-term symptom relief, with the added advantage of addressing the underlying fungal cause rather than merely suppressing inflammation.

Maintenance therapy with ketoconazole shampoo once weekly or fortnightly has been shown to significantly reduce the rate of relapse compared with vehicle (non-medicated) shampoo.

Given the chronic, relapsing nature of seborrhoeic dermatitis, this prophylactic approach is a key component of long-term management.

NICE Clinical Knowledge Summaries (CKS) on seborrhoeic dermatitis recommend ketoconazole 2% shampoo as a first-line treatment for scalp seborrhoeic dermatitis and dandruff.

For mild cases, over-the-counter anti-dandruff shampoos containing zinc pyrithione, selenium sulfide, or coal tar may be tried first, with ketoconazole shampoo used if these are insufficient.

For moderate to severe scalp involvement, a short course of a mild topical corticosteroid (such as betamethasone valerate scalp application) may be used alongside the antifungal shampoo to bring the inflammation under control more quickly.

Ketoconazole shampoo compared with other anti-dandruff treatments

Several active ingredients are used in anti-dandruff and antiseborrhoeic shampoos.

Zinc pyrithione (found in Head and Shoulders and similar brands) has antifungal and antibacterial properties and is effective for mild dandruff but may be less effective than ketoconazole for moderate to severe seborrhoeic dermatitis.

Selenium sulfide (found in Selsun) has antifungal activity and reduces epidermal turnover but can be drying and may discolour light or grey hair.

Coal tar shampoos (such as Neutrogena T/Gel and Polytar) have anti-inflammatory and antiproliferative effects but have a strong odour, can stain light hair, and are cosmetically less acceptable to many users.

Salicylic acid shampoos act as keratolytics, helping to remove thick scale, but do not address the underlying fungal cause.

Ketoconazole 2% shampoo combines potent antifungal activity with anti-inflammatory properties and is generally well tolerated cosmetically. It is considered the most evidence-based topical antifungal treatment for seborrhoeic dermatitis.

Ciclopirox shampoo is an alternative antifungal (available in some countries and occasionally prescribed in the UK) with a different mechanism of action; it chelates iron and aluminium needed for fungal enzyme function.

For facial seborrhoeic dermatitis, which often coexists with scalp involvement, ketoconazole 2% cream (prescription-only in the UK) is the recommended topical antifungal. The shampoo is not intended for use on the face.

Dosage and administration

For treatment of dandruff and seborrhoeic dermatitis, wet the hair, apply ketoconazole 2% shampoo to the scalp, massage into a lather, leave for 3 to 5 minutes, then rinse thoroughly.

Repeat twice weekly for 2 to 4 weeks. For maintenance, use once every 1 to 2 weeks to prevent recurrence.

For pityriasis versicolor, apply the shampoo to the affected skin areas in the shower, lather, leave for 3 to 5 minutes, and rinse.

Use once daily for up to 5 days.

The patches of altered skin colour may take weeks to months to normalise after successful antifungal treatment, even though the fungal infection has been cleared.

If your symptoms do not improve after 4 weeks of treatment, consult your GP for review. You may need additional treatments, such as a topical corticosteroid, or investigation for an underlying condition.

Side effects of ketoconazole shampoo

Common side effects

Local scalp irritation, including a burning or stinging sensation during application, itching, and mild dryness, is the most commonly reported effect. These symptoms are usually transient and mild.

Some users experience increased dryness of the hair, which can be managed with a conditioner applied to the lengths and ends of the hair (avoiding the scalp) after rinsing the medicated shampoo.

Uncommon and rare side effects

Hair texture changes, localised redness, oily or greasy feeling on the scalp, and, rarely, hair discolouration (particularly in chemically treated, grey, or light-coloured hair) have been reported.

Allergic contact dermatitis is rare but possible; discontinue use if significant redness, swelling, or blistering occurs.

Very rare reports of hair loss have been associated with ketoconazole shampoo use, though causality has not been established, as the underlying conditions can themselves cause temporary shedding.

Systemic effects

Systemic side effects are not expected because absorption through the skin is negligible. The hepatotoxicity, adrenal suppression, and drug interactions associated with oral ketoconazole tablets do not apply to the shampoo.

When to seek advice

Consult your pharmacist or GP if you experience persistent or worsening irritation, significant redness or swelling, blistering, or hair loss. Report suspected adverse reactions to the MHRA at yellowcard.mhra.gov.uk.

Warnings and precautions

Contraindications

Do not use ketoconazole shampoo if you are allergic to ketoconazole or any ingredient in the formulation. Check the ingredients list on the bottle.

Precautions

Avoid contact with the eyes. If the condition does not improve after 4 weeks, seek medical advice.

If you are using a topical corticosteroid on your scalp, taper it gradually when switching to ketoconazole shampoo to avoid rebound inflammation.

The shampoo may affect chemically treated or light-coloured hair; test on a small area if concerned.

Pregnancy and breastfeeding

Ketoconazole shampoo is generally considered safe during pregnancy and breastfeeding due to its negligible systemic absorption. Use it only when needed and consult your pharmacist or midwife if uncertain.

Interactions

Clinically significant drug interactions are not expected with ketoconazole shampoo. The serious interactions associated with oral ketoconazole (inhibition of CYP3A4 and other drug-metabolising enzymes) do not occur with topical use.

How to get ketoconazole shampoo in the UK

Ketoconazole 2% shampoo is classified as a pharmacy medicine (P) and can be purchased over the counter at any UK pharmacy without a prescription.

Your pharmacist can advise on its suitability and correct use.

It is also available on NHS prescription from your GP, which may be preferable for patients who are exempt from prescription charges.

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

Well-known branded versions include Nizoral; generic ketoconazole 2% shampoos are also widely available and contain the same active ingredient at the same concentration.

Living with seborrhoeic dermatitis: practical advice

Seborrhoeic dermatitis is a chronic condition that tends to wax and wane.

While it cannot be cured, it can be effectively controlled with appropriate treatment and simple scalp care measures.

Use a gentle, non-medicated shampoo on days when you are not using ketoconazole shampoo.

Avoid scratching the scalp, as this can worsen inflammation and increase the risk of secondary bacterial infection.

Manage stress where possible, as stress is a recognised trigger for flare-ups. Exposure to moderate sunlight may help some people, though avoid sunburn.

Maintain regular follow-up with your pharmacist or GP if the condition is recurrent or difficult to control.

If seborrhoeic dermatitis affects your face, eyebrows, or chest, your GP may prescribe ketoconazole cream, a mild topical corticosteroid, or a calcineurin inhibitor such as tacrolimus or pimecrolimus for facial use.

Sources

• Nizoral 2% Anti-Dandruff Shampoo, Summary of Product Characteristics (EMC)
• Ketoconazole, British National Formulary (BNF)
• Seborrhoeic dermatitis, NICE CKS
• Dandruff, NHS
• Seborrhoeic dermatitis, British Association of Dermatologists
• MHRA Yellow Card Scheme