Quick answer
Ketoconazole shampoo (usually 2%) is an antifungal shampoo that treats dandruff and seborrhoeic dermatitis by reducing Malassezia yeast on the scalp. A typical schedule is twice a week for 2–4 weeks, leaving the lather on for 3–5 minutes before rinsing, then once every 1–2 weeks to stop flakes coming back. Follow the label or your doctor’s advice.
Ketoconazole shampoo is one of the most searched hair products in India, and for good reason: stubborn dandruff that ordinary shampoos cannot fix is often driven by a yeast that ketoconazole targets directly. Here is how it works, how to use it properly and what to watch for.
What is ketoconazole shampoo?
Ketoconazole is an azole antifungal. In shampoo form, usually at 2%, it reduces the growth of Malassezia, a yeast that lives on everyone’s scalp but can trigger flaking, itching and redness in people prone to dandruff or seborrhoeic dermatitis. Ketoconazole shampoos are widely sold in Indian pharmacies; check the pack for the strength and directions.
What does ketoconazole shampoo treat?
- Dandruff: white or yellowish flakes with itching.
- Seborrhoeic dermatitis: greasy scales and redness on the scalp, eyebrows, sides of the nose or behind the ears.
- Pityriasis versicolor (tinea versicolor): light or dark patches on the chest and back, caused by the same yeast; the shampoo is sometimes used as a short body wash for this, as directed on the label.
How to use ketoconazole shampoo
- Wet your hair and scalp.
- Apply a small amount and massage it into the scalp (and other affected areas) until it lathers.
- Leave it on for 3–5 minutes.
- Rinse well. You can use your regular conditioner on the lengths afterwards.
- Wash your hands and avoid getting it in your eyes.
How often should you use it?
| Stage | Typical frequency | Duration |
|---|---|---|
| Treatment (dandruff, seborrhoeic dermatitis) | Twice a week | 2–4 weeks |
| Prevention (maintenance) | Once every 1–2 weeks | Ongoing, as needed |
| Pityriasis versicolor | Once a day | Up to 5 days, as directed |
These are typical schedules from product labelling for 2% shampoo. On other days, wash with a mild shampoo. Always follow your doctor’s instructions if you were prescribed a different plan.
Tip: The 3–5 minute contact time matters. Rinsing straight away gives the active very little time to work.
Side effects
Most people use ketoconazole shampoo without problems. Possible side effects include:
- Itching, burning or redness on the scalp
- Dry or oily hair, or a change in hair texture
- Eye irritation if it gets into the eyes
- Rarely, changes in colour of grey or chemically treated hair
- Rarely, allergic reactions such as rash or swelling
Stop using it and seek medical advice if you develop a rash, swelling or severe irritation. If you are pregnant, breastfeeding, or using it on a child, check with a doctor first.
Does ketoconazole shampoo cause or stop hair fall?
Some people notice more hair in the drain when they first treat a flaky, inflamed scalp, often because loose hairs come out during a thorough wash. Dandruff itself does not usually cause permanent hair loss. There is some early research on ketoconazole for pattern hair loss, but it is not a proven hair-growth treatment. If you are losing hair, check your stage with our free Norwood scale hair loss test and see a dermatologist.
Ketoconazole vs other anti-dandruff shampoos
| Active | How it works | Good for |
|---|---|---|
| Ketoconazole 2% | Antifungal | Moderate to stubborn dandruff, seborrhoeic dermatitis |
| Zinc pyrithione | Antifungal and antibacterial | Mild dandruff, frequent washing |
| Selenium sulfide | Antifungal; slows skin cell turnover | Stubborn flaking |
| Ciclopirox | Antifungal | Seborrhoeic dermatitis |
| Salicylic acid | Loosens and lifts scales | Thick, sticky flakes |
| Coal tar | Slows skin cell turnover | Psoriasis and thick scaling |
Many people rotate two actives, for example ketoconazole twice a week and a zinc pyrithione shampoo on other wash days.
Tips for Indian weather and hair
- Humidity and sweat can worsen dandruff, so wash more often in summer and the monsoon.
- Heavy scalp oiling may feed Malassezia; if your scalp is flaky, oil the lengths rather than the scalp.
- Hard water can leave build-up; a clarifying wash now and then helps.
See a dermatologist if
- Flaking does not improve after 4 weeks of correct use
- Your scalp is very red, painful, oozing or crusted
- You have patchy hair loss or thick silvery scales (which could be psoriasis)
- Rashes spread to your face, chest or body
Key takeaways
- Ketoconazole 2% shampoo targets the yeast behind dandruff and seborrhoeic dermatitis.
- Leave it on for 3–5 minutes before rinsing.
- Typical use: twice a week for 2–4 weeks, then once every 1–2 weeks.
- Side effects are usually mild: dryness, itching or irritation.
- See a dermatologist if there is no improvement after 4 weeks.
Frequently asked questions
Can I use ketoconazole shampoo every day?
Usually not needed. Typical treatment is twice a week for 2–4 weeks, then once every 1–2 weeks. Daily use is only for short courses when a doctor or label directs it.
How long should I leave ketoconazole shampoo on?
About 3–5 minutes before rinsing, so the antifungal has time to work.
Can I use conditioner after ketoconazole shampoo?
Yes. Rinse the shampoo out first, then condition the lengths of your hair as usual.
Is ketoconazole shampoo safe for coloured hair?
It is generally used on coloured hair, but rarely it can change the shade of grey or chemically treated hair. Patch test on a small section if you are worried.
How long does ketoconazole shampoo take to work?
Many people see less flaking within 2–4 weeks of correct use.
Is ketoconazole shampoo good for hair fall?
It treats dandruff, which can make the scalp healthier, but it is not a proven treatment for pattern hair loss.
Find out how your hair holds moisture with our hair porosity test.
This article is for general information only and is not medical advice. It has not been reviewed by a doctor. For any skin or hair condition, consult a dermatologist.
