Ketoconazole
An antifungal cream and shampoo used for dandruff, seborrheic dermatitis, tinea versicolor and ringworm. The tablet form is no longer used for skin infections because of liver risk.
Key facts
Ketoconazole at a glance.
Used for
Dandruff and selected fungal rashes
Results
1–2 weeks
Treatment commitment
Initial course; maintenance if needed
Key precautions
Topical irritation; keep out of eyes
What is it?
Top things to know about Ketoconazole
- It is an azole antifungal. Ketoconazole interferes with fungal cell membranes.
- It treats yeasts and dermatophytes. It is used for fungal infections and seborrheic dermatitis.
- It does not prevent recurrence. Seborrheic dermatitis tends to return.
- Scalp ringworm needs more. Shampoo alone does not treat infected hair roots.
Often used for
What Ketoconazole is used for
HOW IT WORKS
How Ketoconazole works
Diagram explanation and sources
Limits ergosterol production: Reduces a building block of fungal cell membranes. Disrupts fungal membranes: Fungi have more difficulty maintaining normal cells. Reduces susceptible fungi: Fungal and yeast-related skin problems can improve.
Topical ketoconazole impairs fungal ergosterol synthesis. The contribution of Malassezia reduction to seborrheic dermatitis benefit is proposed rather than fully established. Species and resistance matter.
Strengths
Ketoconazole strengths
Ketoconazole skin and scalp products include 1% OTC dandruff shampoo and 2% prescription formulations. Shampoo, cream and foam have different indications and contact instructions; oral ketoconazole is a separate medicine with major safety restrictions.
1%
2%
A rinse-off scalp product. It is not a lower-dose equivalent of a leave-on cream.
The appropriate vehicle depends on the diagnosis and site. Matching percentages do not make rinse-off and leave-on directions interchangeable.
Forms
Ketoconazole forms
Shampoo
A cleansing vehicle that spreads through wet hair and rinses away. Cleansing agents can affect dryness and comfort.
Cream
Richer and more moisturizing; often suits dry skin. The full formula still affects comfort.
Foam
Easy to spread through hair or over larger areas. Moisturizing feel and stinging vary with the formula.
How to use it
Your treatment, step by step.
How to apply it
- 01
When to Apply
For the shampoo, twice a week on wet hair. Lather it in, leave it on the scalp three to five minutes, then rinse. Contact time is what works, not volume. For the cream, a thin layer once or twice a day over the area and a little past its edge.
- 02
How to Start
Twice-weekly shampoo, or daily cream, for the first two to four weeks. Tinea versicolor is often treated with the shampoo as a body wash, left on five minutes, daily for a few days or weekly for a few weeks. Athlete's foot needs longer, often about six weeks.
- 03
If It Irritates
Mild stinging, dryness or an itchy scalp early on usually settles. Rinsing more thoroughly, dropping to once a week, or switching from gel or foam to cream generally fixes it. A rash that worsens each time you use it may be an allergy, and needs a look.
- 04
If It's Not Working
Give it two full weeks used correctly, with the contact time. If the scalp is no better, the reasons are usually rinsing too soon, a different diagnosis such as psoriasis, or a fungus that needs a tablet. Rotating with selenium sulfide, zinc pyrithione or ciclopirox often helps.
Monitoring & follow-up
No blood tests and no routine monitoring for the cream, shampoo, gel or foam. Absorption through intact skin is minimal, and the serious risks belong to the tablet.
People use this for years. Seborrheic dermatitis and dandruff are long-term conditions, and continuing at a lower frequency is the normal plan, not a sign something has gone wrong.
The exception to watch for is an allergic contact reaction, a rash that worsens each time it is used. Uncommon, but it happens, and it is a reason to stop and have it looked at rather than to use it more often.
Oral ketoconazole is the version that needs liver blood tests, heart tracings and interaction checks. It is not used for skin infections.
What to expect
How things change over time.
Using it
Lather, leave it on a few minutes, then rinse. Twice a week on the scalp.
Itch settles
Itching and greasiness ease first, often within the first few washes.
Flaking drops
Scale on the scalp or sides of the nose drops substantially, so judge it here. Tinea versicolor clears in the same window.
Skin infections clear
Ringworm, jock itch and yeast in folds clear here. Treat a little beyond the visible edge, since the fungus extends past it, and keep the fold dry.
Athlete's foot
The soles are thick and slow, so this takes longer.
Maintenance
For dandruff and seborrheic dermatitis, move to once a week or every other week rather than stopping. This is control, not a cure.
- First wash
- Days 1 to 7
- Weeks 1 to 2
- Weeks 2 to 4
- Around 6 weeks
- Beyond 4 weeks
When you stop
Stop the cream once the infection has cleared, usually about a week after the skin looks normal, so nothing is left at the edges.
The shampoo is different. Dandruff and seborrheic dermatitis are driven by a yeast that lives on the skin permanently, so stopping usually means the flaking returns over the following weeks. No rebound and no withdrawal, it just goes back to how it was.
Step down rather than stop, twice weekly while it is active, then once a week or every other week to hold it. Some people need it only in winter or during stressful periods.
What it Pairs with
Ketoconazole + your routine
| Product or situation | With Ketoconazole | What to know |
|---|---|---|
| Rinsing the shampoo out straight away | Avoid | Contact time is the treatment. Three to five minutes on the scalp is the difference between working and not. |
| Using it in or near the eyes | Avoid | It stings sharply. Rinse with water if it gets in. |
| The gel or foam on broken or raw skin | Avoid | Both contain alcohol and sting badly there. |
| Stopping the moment the flakes go | Avoid | Seborrheic dermatitis returns within weeks for most people. A weekly wash keeps it quiet. |
| Scrubbing or picking scale off the scalp | Avoid | It irritates the skin, and irritated skin flakes more. |
| Expecting a nail to respond | Avoid | Topical antifungals do not reach through the nail plate. |
| If a rash gets worse each time you apply it | Use care | That pattern suggests allergy to the product rather than irritation. |
| If the scalp has thick, silvery, well-defined plaques | Use care | That looks more like psoriasis, which needs different treatment. |
| If the flaking is on an infant's scalp | Use care | Cradle cap is managed differently, and often needs no treatment early on. |
| If you are offered ketoconazole tablets | Use care | For a skin or nail infection, ask why, since that use was withdrawn and safer tablets exist. |
| If a fungal rash keeps returning | Use care | Recurring or widespread infection despite correct use can point to diabetes, a suppressed immune system, or a pet or family member as the source. |
| If you are pregnant or breastfeeding | Use care | Ask the doctor managing your pregnancy before using it, and keep it off the chest area if breastfeeding. |
Getting it and cost
Getting Ketoconazole.
Cost & access
The 1% shampoo is over the counter and inexpensive, and store-brand versions work the same for less.
What affects the cost
The 2% shampoo and cream are generic and among the cheaper prescriptions in dermatology.
What affects the cost
The 2% gel and foam cost much more, and insurance often requires trying the cream or shampoo first. They are worth the difference mainly for hairy areas where cream is impractical.
What affects the cost
Selenium sulfide and zinc pyrithione shampoos are cheaper alternatives with reasonable evidence, and rotating between them keeps costs down.
Alternatives
Other options to consider.
Selenium sulfide shampoo
similar evidence for dandruff and tinea versicolor, and cheaper. Has a stronger smell and can discolor light or treated hair.
Zinc pyrithione shampoo
widely available and gentle, with good evidence for mild dandruff. Generally less effective than ketoconazole for stubborn seborrheic dermatitis.
Ciclopirox shampoo or cream
comparable results, and a useful alternative to rotate to when ketoconazole seems to stop helping.
Terbinafine cream
more effective than ketoconazole for ringworm, jock itch and athlete's foot, and often a shorter course. Does not treat seborrheic dermatitis or tinea versicolor, because it does not cover the yeast behind them.
Clotrimazole or miconazole cream
same family, similar results, cheaper and easier to buy. Reasonable for straightforward ringworm or yeast in a fold.
A mild topical steroid
settles the redness and itch of seborrheic dermatitis faster, but does nothing about the yeast and cannot be used long term on the face. Often used briefly alongside ketoconazole rather than instead of it.
Tacrolimus or pimecrolimus cream
steroid-free options for facial seborrheic dermatitis that needs long-term treatment. More expensive, and they can sting at first.
Questions
Questions you might be asking.
How long do I leave the shampoo on?
Three to five minutes before rinsing. Rinsing straight away is the most common reason people think it failed.
How often should I use it?
Twice a week while it is active, then once a week or every other week to keep it quiet.
Will it make my hair fall out?
No. It has been looked at for a small possible benefit in pattern hair loss, not as a cause.
Can I use it on my face?
The cream, yes, for seborrheic dermatitis on the sides of the nose, eyebrows and hairline. Keep it away from the eyes.
Why are the pale patches still there after treatment?
Tinea versicolor leaves uneven color behind after the fungus is gone. It fades over weeks to months, and looks more obvious once the surrounding skin tans.
Should I be taking the tablet instead?
No. Oral ketoconazole had its skin and nail uses withdrawn because of serious liver injury and drug interactions. If a tablet is needed, terbinafine, fluconazole or itraconazole is used.
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