Nizoral (Ketoconazole) 200 mg Tablets: Prescription Oral Antifungal for Systemic Fungal Infections — Ketoconazole Shampoo Also Available

Information last reviewed: May 2026 — for educational purposes only.

Ketoconazole, sold as Nizoral and in generics, is an azole antifungal that exists in very different forms with different safety profiles. Oral ketoconazole 200 mg tablets are prescription-only and carry an FDA black box warning for serious, potentially fatal hepatotoxicity — they should only be used when no other antifungal therapy is available. In contrast, ketoconazole shampoo 1% is available over the counter and shampoo 2% is Rx-only — both topical products have an excellent safety record for scalp conditions.

FDA Black Box Warning for Oral Ketoconazole

In 2013, the FDA issued a black box warning — the most serious warning level available — for oral ketoconazole tablets due to the risk of:

• Serious hepatic toxicity — including liver failure, requiring transplant or resulting in death
• Adrenal insufficiency — oral ketoconazole blocks adrenal androgen synthesis and can suppress cortisol production, particularly at higher doses
• Drug interactions causing QT prolongation — ketoconazole is a potent CYP3A4 inhibitor; co-administration with CYP3A4-dependent drugs metabolised to QT-prolonging compounds can cause arrhythmias

The FDA directed that oral ketoconazole should not be used as first-line therapy for any indication and should only be prescribed when the benefits outweigh the risks and no alternative antifungal is appropriate. Oral ketoconazole is currently used as last-resort therapy for blastomycosis, coccidioidomycosis, histoplasmosis, chromomycosis, and paracoccidioidomycosis when safer agents (fluconazole, itraconazole, voriconazole) have failed or cannot be used.

What Is Ketoconazole Shampoo Used For?

Topical ketoconazole shampoo does not carry the same liver risk as oral tablets because systemic absorption from shampoo is minimal. It is used for:

• Dandruff and seborrhoeic dermatitis — OTC 1% shampoo used twice weekly for 4 weeks, then once every 1–2 weeks for maintenance
• Tinea versicolor (pityriasis versicolor) — Rx 2% shampoo applied once, left on for 5 minutes, then rinsed; may repeat in 2–4 weeks
• Tinea capitis (scalp ringworm) adjunct — as an adjunct to oral antifungal therapy

Strengths and Formulations

• Oral tablets 200 mg (Rx) — Nizoral or generic ketoconazole; last-resort only; taken once or twice daily with meals; requires baseline and periodic LFT monitoring; not recommended beyond intended duration of treatment
• Shampoo 1% (OTC) — Nizoral A-D; for dandruff and seborrhoeic dermatitis; widely available without a prescription
• Shampoo 2% (Rx) — Nizoral shampoo; for tinea versicolor and seborrhoeic dermatitis; requires prescription in the US
• Cream 2% (Rx) — for tinea pedis, tinea cruris, tinea corporis, cutaneous candidiasis, and seborrhoeic dermatitis; topical use only

Price of Ketoconazole Products

OTC Nizoral A-D 1% shampoo is widely available at pharmacies and online retailers at typical retail prices. Generic versions are less expensive. Oral ketoconazole 200 mg tablets are inexpensive in generic form but their use is highly restricted. Rx ketoconazole 2% shampoo is available at low cost with a prescription.

Frequently Asked Questions

Is Nizoral shampoo safe to use regularly?

Yes. OTC Nizoral A-D 1% shampoo is well-tolerated with minimal systemic absorption. It can be used as directed for dandruff control on an ongoing maintenance basis. Some users note scalp dryness or hair texture changes with everyday use, but the product is considered safe for regular use as directed on the label.

Can ketoconazole shampoo treat hair loss?

There is some evidence suggesting ketoconazole shampoo may have modest benefits for androgenetic alopecia (male/female pattern hair loss) in addition to treating scalp seborrhoeic dermatitis. Ketoconazole has anti-androgenic properties and may reduce DHT-driven inflammation at the scalp. However, it is not approved for this indication and should not replace proven hair loss treatments (finasteride, minoxidil).

Why can I not just use oral ketoconazole for a nail or skin fungal infection?

Oral ketoconazole is no longer recommended for common fungal infections such as nail fungus or ringworm because safer alternatives exist — terbinafine and itraconazole are preferred for onychomycosis, and fluconazole or terbinafine for skin dermatophytosis. The hepatotoxicity risk of oral ketoconazole does not justify its use for non-life-threatening infections when safer options are effective.

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