Ketoconazole shampoo: what it treats, and the flakes it will not touch

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Researched. We have not used this one long enough to give you a verdict, and we would rather say so than invent one. What follows is how it works, who it suits, and what it will not do. When we have used it properly, this page carries the verdict and the date.

Nizoral Anti-Dandruff Shampoo, 1% Ketoconazole

Flakes are not one problem. They are at least three, they look much the same in a mirror, and each has a different answer. Ketoconazole shampoo is the right answer to one of them and money wasted on the other two, so it is worth knowing which one you have before you buy it.

What dandruff actually is

Every scalp carries a yeast called Malassezia. It feeds on the oil your scalp produces, and on most people it lives there unnoticed. On some it provokes a reaction: the skin turns over faster than it should, and the dead cells clump together and shed as flakes. That is dandruff. Its heavier, redder, itchier form is seborrhoeic dermatitis.

The part that matters when you are buying something: the yeast is the driver. Wash the flakes away and they come back, because whatever is producing them is still there.

What ketoconazole does

It is an antifungal. It reduces the yeast, and with less yeast there is less of the reaction that makes the flakes. That is a different job from an ordinary shampoo, which lifts flakes and oil off the scalp and leaves the yeast exactly where it was.

Other dandruff shampoos go after the same yeast with different actives — zinc pyrithione, selenium sulphide. Ketoconazole is usually the one people move to when those have not done enough.

Reading the two claims on the listing

The listing says this is the only over-the-counter dandruff shampoo with 1% ketoconazole, which is the strength sold without a prescription in the US.

It also says the ingredient is ten times more effective at killing scalp fungus than the active in the leading dandruff shampoo — based on lab testing, and, in its own words, not a product-to-product comparison. That is a statement about two ingredients in a lab, not about two bottles on a scalp. It is not nothing. It is not a head-to-head either, and it is worth reading it as exactly what it says.

The three kinds of flake, and which one this is for

Dandruff. Larger flakes, often yellowish or greasy-looking, on a scalp that itches and may be oily. This is the yeast-driven kind, and it is what ketoconazole is for.

Dry scalp. Small, fine, white flakes and a tight feeling, often worse in winter and after long hot showers. There is no yeast problem to treat, and a medicated shampoo can leave a dry scalp drier.

Buildup. Residue from styling products, dry shampoo and heavy conditioners that dries and flakes away. That is a cleansing problem rather than a medical one, and it is what a clarifying shampoo is for — we have written about the two kinds of buildup separately.

If you are not sure which you have, that is a fair question to put to a pharmacist, who can look at your scalp in a way a web page cannot.

How it is meant to be used

Like a medicine, because it is one. The US label has you wet your hair, lather, rinse thoroughly and repeat, every three to four days for up to eight weeks — and after that, only as needed to keep the dandruff under control. It is labelled for adults and children twelve and over; for anyone younger, ask a doctor first.

It is not an everyday shampoo, and using it every day does not make it work faster. Between treatment washes, use whatever you normally use. The ketoconazole days are doing the treating; the other days are just washing.

If your hair is coloured

The listing says it is gentle enough for colour-treated, chemically processed and grey hair. And because it goes on every few days rather than every day, most of your washes are still with your usual colour-safe shampoo. If your colour is expensive to keep up, it is still worth mentioning to whoever does it.

What it will not do

It will not fix a dry scalp, and it may make one worse. It will not remove product buildup any better than a normal shampoo. And it is not a one-time fix — the yeast is a normal resident of every scalp, and once you stop using it, the flakes can come back. That is why the label moves you to "as needed" rather than "done".

If the flaking is severe, is spreading to your face or eyebrows, or has not improved by the end of the course on the label, stop experimenting and see a doctor. That is past what an over-the-counter shampoo is for.

The product

A 1% ketoconazole shampoo in a fresh scent. The ingredient is what you are paying for, and the reason to choose it is that you have the yeast-driven kind of flake and a milder dandruff shampoo has stopped keeping up.

The one people are searching for is the Nizoral Anti-Dandruff Shampoo with 1% Ketoconazole, Fresh Scent, 7 Fl Oz.

Nizoral Anti-Dandruff Shampoo, 1% Ketoconazole

We do not print prices here, because a price we typed last month is a price that is wrong today.

Written by CatieH, who covers nails and hair here.