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Ketoconazole: Uses, Mechanism & Side Effects

Ketoconazole is an antifungal medication used to treat fungal infections. It works by disrupting the fungal cell membrane and is available as a cream, shampoo, and tablet.

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Things worth knowing about "Ketoconazole"

Ketoconazole is an antifungal medication used to treat fungal infections. It works by disrupting the fungal cell membrane and is available as a cream, shampoo, and tablet.

What is Ketoconazole?

Ketoconazole is a synthetic antifungal agent belonging to the azole class of antifungals. Developed in the 1970s, it is one of the most widely used active ingredients for treating fungal infections (mycoses). Ketoconazole is effective against both mold fungi and yeast fungi such as Candida albicans and Malassezia species.

Mechanism of Action

Ketoconazole works by inhibiting the enzyme lanosterol 14-alpha-demethylase, which fungi require to synthesize ergosterol. Ergosterol is an essential component of the fungal cell membrane, functionally similar to cholesterol in human cells. By blocking this enzyme, ketoconazole disrupts the integrity of the fungal cell membrane, ultimately leading to cell death.

Indications

Seborrheic dermatitis (dandruff and scaling of the skin and scalp)
Pityriasis versicolor (tinea versicolor)
Tinea infections (athlete's foot, nail fungus, ringworm)
Candidiasis (yeast infections of the skin and mucous membranes)
Systemic fungal infections (only in severe, specific cases)
In endocrinology: treatment of Cushing's syndrome (off-label use, as ketoconazole also inhibits cortisol synthesis)

Forms and Dosage

Topical Application (on the skin)

Ketoconazole is available as a cream (typically 2%), shampoo (1% or 2%), and gel. These formulations are applied directly to affected skin areas or the scalp. Availability without a prescription depends on the concentration and country. For dandruff or scalp fungal infections, the shampoo is typically used twice weekly for two to four weeks.

Systemic Application (tablets)

Oral ketoconazole tablets are severely restricted or only approved for specific indications (e.g., Cushing's syndrome) in many countries due to serious liver toxicity risks. Dosage is always determined by a prescribing physician.

Side Effects

Topical Use

Skin irritation, burning, or itching at the application site
Rarely: allergic reactions

Systemic Use (tablets)

Hepatotoxicity (potentially severe; regular liver function monitoring is required)
Nausea, vomiting, abdominal pain
Headache, dizziness
Hormonal changes (inhibition of testosterone and cortisol synthesis)
Interactions with numerous other medications (CYP3A4 inhibitor)

Important Notes

Ketoconazole tablets must not be taken together with certain medications due to the risk of liver damage, including some antihistamines, statins, and other hepatotoxic substances. Pregnant and breastfeeding individuals should use ketoconazole only after consulting a physician. The risk profile for topical use is considerably more favorable.

References

European Medicines Agency (EMA): Ketoconazole-containing medicinal products. EMA/596624/2013. Available at: www.ema.europa.eu
Pappas PG et al. - Clinical Practice Guideline for the Management of Candidiasis. Clinical Infectious Diseases, 2016;62(4):e1-e50.
Brunton LL, Hilal-Dandan R, Knollmann BC - Goodman & Gilman's: The Pharmacological Basis of Therapeutics. 13th Edition. McGraw-Hill Education, 2018.

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