Ketoconazole shampoo is an antifungal best known for treating dandruff and seborrheic dermatitis. It also comes up often in conversations about hair loss. This guide explains why, what the evidence shows, and how to use it safely.
What ketoconazole is
Ketoconazole is an antifungal medication. As a shampoo, it reduces the yeast (Malassezia) involved in dandruff and seborrheic dermatitis, which can cause flaking, itching and scalp inflammation. Lower-strength ketoconazole shampoo is available over the counter; higher strengths require a prescription.
Why it is discussed for hair loss
There are two reasons. First, scalp inflammation from dandruff or seborrheic dermatitis can make the scalp uncomfortable and may contribute to shedding, so treating it supports a healthier scalp. Second, laboratory and small clinical studies have suggested ketoconazole may have mild anti-androgen effects on the scalp, and some small studies reported benefits when it was used alongside other treatments for pattern hair loss.
What the evidence shows
Evidence that ketoconazole treats pattern hair loss on its own is limited. Studies are small and often combine it with other treatments. It is best viewed as a supportive scalp treatment, especially for people with dandruff or seborrheic dermatitis, rather than a primary hair loss treatment. See treatments with the strongest evidence.
How it is typically used
Follow the product label or your provider's instructions. Ketoconazole shampoo is usually lathered, left on the scalp for a few minutes, and rinsed, and it is used a few times a week rather than daily. It can be drying, so a conditioner on the lengths may help.
Side effects
- Dryness, itching or irritation of the scalp
- Changes in hair texture, and occasionally discoloration of treated or light hair
- Rarely, an allergic reaction. Stop and seek care for swelling or a severe rash.
The shampoo is different from oral ketoconazole, which has significant safety restrictions and is not used for hair loss.
When to see a doctor
See a doctor if flaking and itching do not improve with over-the-counter treatment, or if you have scalp pain, pus, patches of hair loss or scarring. See common scalp issues.
Next step
If you want a licensed provider to review your hair loss, start your online consultation.
Prescription required for prescription treatment. A licensed provider decides whether treatment is appropriate. Individual results vary. Prescribed Essence currently serves patients in California, Colorado, Florida and New York.
