Ketoconazole
Imidazole antifungal active ingredient (2% prescription / 1% over-the-counter shampoo, e.g. Nizoral). Approved agent for seborrheic dermatitis and dandruff; in androgenetic alopecia an off-label adjunct alongside minoxidil/finasteride.
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WHAT IS KETOCONAZOLE?
Detailed overview
Ketoconazole is a broad-spectrum antifungal active ingredient with an imidazole scaffold, best known in the scalp context in its 2% prescription or 1% over-the-counter (OTC) shampoo/foam form (e.g. Nizoral). Its approved use is antifungal: treatment of seborrheic dermatitis, dandruff and tinea, because it suppresses the scalp's Malassezia yeast. It appears in the hair-medicine library because in androgenetic alopecia (AGA) it is used off-label as an adjunctive (add-on) agent, typically as a 2% shampoo 2-3 times per week, alongside minoxidil and/or finasteride. Important: this is an adjunctive agent, NOT a standalone AGA cure, and it does not replace minoxidil or finasteride. From a safety standpoint it must be sharply distinguished from systemic, orally taken ketoconazole: the oral form was restricted, or withdrawn from systemic use, because of hepatotoxicity and adrenal suppression, whereas the scalp shampoo has minimal systemic absorption and a benign safety profile.
Class
Imidazole antifungal
Status
Approved antifungal; off-label adjunct for AGA
Mechanism of action
Antifungal/anti-inflammatory + weak local antiandrogen
Form
2% Rx / 1% OTC shampoo, 2-3× weekly
Evidence
Modest, adjunctive (add-on) role
Data console
Lab data
Safety
Side effects, stop signs, contraindications
Side effects · 4
- Local scalp irritation: itching, redness and a stinging sensation at the application site; usually mild and transient.
- Scalp and hair dryness: regular shampooing can dry out the scalp and hair; a moisturising hair-care routine can ease it.
- Occasional hair-texture change: hair may feel drier and more brittle; typically reversible by reducing the frequency of use.
- Rare contact dermatitis: a hypersensitivity skin reaction (rash, increased redness, itching); use should be stopped if it occurs.
Contraindications · 3
- Known hypersensitivity to ketoconazole or other imidazole compounds, or to any component of the product.
- Damaged, inflamed or open-wound scalp: application should be avoided because of increased absorption and irritation.
- For external scalp use only: not to be ingested, avoid contact with the eyes; it is not the same as, and does not replace, systemic oral ketoconazole.
Related Hair & Skin
Same therapeutic category
Studies
Related research and clinical findings
Ketoconazole shampoo: effect of long-term use in androgenic alopecia.
Piérard-Franchimont C, De Doncker P, Cauwenbergh G
Topical ketoconazole for the treatment of androgenetic alopecia: A systematic review.
Fields JR, Vonu PM, Monir RL, et al.
Topical ketoconazole: a systematic review of current dermatological applications and future developments.
Choi FD, Juhasz MLW, Atanaskova Mesinkovska N
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Educational hair and skin info from official sources (PubMed, FDA, EMA). Does NOT replace medical consultation. Talk to a dermatologist!
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The information here is strictly for educational and scientific purposes. It does not replace medical advice or clinical consultation, and it does not encourage illegal substance or pharmaceutical use. Data is sourced. When in doubt, consult your doctor.