Is ketoconazole 1% strong enough for dandruff?
For most people, yes. The 1% shampoo is the strength sold for everyday flaking and itch, and plenty of people control a flaky scalp on it for years.
Ketoconazole 1% is the drugstore strength. You can buy it as an anti-dandruff shampoo with no prescription, and for ordinary dandruff it is usually enough. Ketoconazole 2% is the prescription strength. It clears flaking faster and comes in creams and foams for skin, which matters for stubborn or widespread seborrheic dermatitis.
| The difference | Ketoconazole 1% | Ketoconazole 2% |
|---|---|---|
| What it does | Cuts the yeast, calms the flaking | The same job, more of it |
| How long till it works | Two to four weeks | One to two weeks |
| How long the result lasts | As long as you keep using it | The same, on fewer washes |
| Cost | Drugstore price, no appointment | Needs a prescription first |
Side by side
Ketoconazole 1%
Shampoo, twice a week
Lather it into the scalp and leave it there for three to five minutes before rinsing. Sold over the counter for dandruff, for adults and children over 12.
Ketoconazole 2%
Shampoo, cream, foam or gel
The shampoo is used the same way. The 2% strength also comes as a cream, foam and gel for skin on the face, chest and body. The 1% does not.
Ketoconazole 1%
Cuts the yeast, calms the flaking
Ketoconazole is an antifungal. It reduces Malassezia, the yeast that lives on everyone's skin and drives dandruff and seborrheic dermatitis in some people.
Ketoconazole 2%
The same job, more of it
Same drug, twice the concentration. The trial that compared them found the 2% shampoo reduced both flaking and scalp yeast more than the 1% over four weeks.
Ketoconazole 1%
It will not cure it
Dandruff and seborrheic dermatitis are controlled, not cured. Stop washing with it and the flaking usually creeps back over a few weeks.
Ketoconazole 2%
It will not fix a nail or hair problem
Nothing rubbed on the scalp reaches inside a nail, so nail infections need tablets. It is also not a hair growth treatment, whatever the forums say.
Ketoconazole 1%
Two to four weeks
Itch often settles in the first week. Give it a full month before deciding it has failed.
Ketoconazole 2%
One to two weeks
Faster, and it usually gets a scalp fully clear where the 1% gets it most of the way.
Ketoconazole 1%
As long as you keep using it
Twice a week keeps things quiet. Stop completely and flaking generally returns within a month or two.
Ketoconazole 2%
The same, on fewer washes
Once it is clear, most people drop to once or twice a week to hold it there.
Ketoconazole 1%
Dryness and mild stinging
The usual complaints are a dry scalp, itching and hair that feels stripped. Some people with colour-treated hair find it dulls.
Ketoconazole 2%
A little more of the same
A higher concentration means slightly more chance of dryness or stinging. Most people tolerate it, and using it less often usually solves it.
Ketoconazole 1%
Drugstore price, no appointment
Around the price of a premium shampoo, and a bottle lasts a couple of months at twice-weekly use.
Ketoconazole 2%
Needs a prescription first
That means an appointment. Generic ketoconazole is widely stocked and is usually one of the cheaper prescription options.
Common questions
For most people, yes. The 1% shampoo is the strength sold for everyday flaking and itch, and plenty of people control a flaky scalp on it for years.
It is the same drug at twice the concentration. The 2% clears flaking faster and more completely, and it comes in creams and foams for skin that the 1% does not.
In the US the 2% strength needs a prescription, while the 1% shampoo is sold over the counter. Availability differs between countries.
Three to five minutes on the scalp before rinsing. Rinsing straight out is the most common reason people think the shampoo did nothing.
Twice a week while you are getting it under control, then once or twice a week to keep it there. It manages the condition rather than curing it.
Switch ingredients rather than strengths. Zinc pyrithione, selenium sulfide and ciclopirox all work on the same yeast, and persistent flaking is worth having looked at in case it is not dandruff.