What Is Ketoconazole?
Ketoconazole is an oral and topical antifungal medication used primarily to treat infections caused by fungus or yeast.
Oral ketoconazole was first FDA-approved in 1981. However, in 2016, the FDA issued severe warnings about the use of oral ketoconazole due to possible liver failure. Therefore, the FDA restricts the oral use to treat serious systemic fungal infections as a last resort.
Topical ketoconazole, unlike the oral form, is widely used for superficial fungal infections of the skin. Topical ketoconazole is available in various formulations such as creams, shampoos, gels, and foam. Topical ketoconazole was first FDA-approved in 1985 for fungal infections of the skin. Topical 2% ketoconazole prescription shampoo was FDA-approved in 1990 for dandruff and seborrheic dermatitis.
How Ketoconazole Works for Hair Loss
Ketoconazole shampoo and foam is helpful in treating seborrheic dermatitis (dandruff) of the scalp by decreasing the relative abundance of the Malassezia yeast. There is a common misconception that the inflammation from seborrheic dermatitis worsens androgenetic alopecia. There are no scientific studies showing a relationship between seborrheic dermatitis and androgenetic alopecia.
Topical ketoconazole acts as a weak androgen receptor antagonist (i.e., anti-androgen), so there is the hope that it might help with androgenetic alopecia.
Also Read: Is Topical Pyrilutamide the Next Big Treatment for Hair Loss?
Who Is a Good Candidate?
Patients with seborrheic dermatitis are excellent candidates for topical ketoconazole. Topical ketoconazole’s anti-androgen side effect is localized to the scalp, which may help slow the thinning nature of androgenetic alopecia; however, I would not hold my breath waiting for these possible positive results.
Dosage and How to Take It
Topical 2% ketoconazole shampoo is available via a prescription from a doctor. The 1% ketoconazole shampoo is now over-the-counter, so it is not necessary to get a doctor’s prescription.
The shampoo should be applied to a wet scalp and left on for 5 minutes on an average of two to four times a week.
Effectiveness: Does Ketoconazole Work for Hair Loss?
Topical ketoconazole is definitely effective for dandruff and seborrheic dermatitis of the scalp.
Since topical ketoconazole has weak anti-androgen properties, there is a theoretical possibility that it would be beneficial in the treatment of androgenetic alopecia. Unfortunately, the studies reporting efficacy are poorly designed with small sample sizes.
A very telling sign of the minimal efficacy of topical ketoconazole in the treatment of androgenetic alopecia is that the company that got it FDA-approved for seborrheic dermatitis is not looking to get it FDA-approved for androgenetic alopecia. Drug companies love to make money; if topical ketoconazole caused a significant benefit in androgenetic alopecia, the company would be actively trying to get it FDA-approved.
Also Read: What Are the Best Medications for Hair Loss?
Results Timeline: What to Expect
2% ketoconazole shampoo usually improves the dandruff and scaling from seborrheic dermatitis within a few weeks. Once the scaling and dandruff are under control, applications once a week for maintenance are recommended.
Patients holding their breath awaiting results for androgenetic alopecia may turn blue in the face.
Side Effects and Risks
Topical ketoconazole is considered very safe because it is not significantly absorbed into the bloodstream, thus avoiding the severe liver and hormonal risks associated with oral ketoconazole.
Topical ketoconazole can occasionally cause skin irritation such as burning, stinging, redness, and itching. Rarely, patients can become allergic or photosensitive to topical ketoconazole.
Ketoconazole vs Other Medications
All three of the medications below have been shown in studies to have a significant benefit in slightly reversing and slowing the progression of androgenetic alopecia. It would not be prudent to put off using these products, waiting to see if the ketoconazole shampoo may be somewhat effective:
Combination Therapy
If I were going to use any medications in combination, it would be oral minoxidil taken with either oral finasteride or dutasteride. Since they have different mechanisms of action in treating androgenetic alopecia, they are synergistic. If you have seborrheic dermatitis, you can add 2% ketoconazole shampoo, but don’t expect any benefit for androgenetic alopecia.
My Experience
I personally use ketoconazole 2% shampoo for the seborrheic dermatitis of my scalp. I do not think it’s of much, if any, benefit for my androgenetic alopecia. I have been taking oral finasteride for the last 19 years, and I’m going to be on it the rest of my life. We know from the medical studies that both finasteride and minoxidil in combination therapy are synergistic. Patients can use ketoconazole shampoo, but not at the expense of not using finasteride and/or minoxidil for their androgenetic alopecia.
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