Ketoconazole Pharmacology
Real Life Pharmacology - Pharmacology Education for Health Care Professionals
Eric Christianson, PharmD; Pharmacology Expert and Clinical Pharmacist
4.9 • 773 Ratings
🗓️ 10 July 2025
⏱️ 14 minutes
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Summary
Ketoconazole is an imidazole antifungal that works by inhibiting fungal cytochrome P450 14α-demethylase, an enzyme essential for ergosterol synthesis, which disrupts fungal cell membrane integrity.
Common adverse effects of ketoconazole include nausea, vomiting, abdominal pain, and elevated liver enzymes, with hepatotoxicity being a notable concern.
Ketoconazole carries a boxed warning for severe hepatotoxicity, including cases of liver failure and death, and should not be used as a first-line treatment for fungal infections when other safer antifungals are available.
Another boxed warning highlights ketoconazole’s potential to prolong the QT interval, increasing the risk for life-threatening ventricular arrhythmias such as torsades de pointes.
Ketoconazole is a strong inhibitor of CYP3A4 and can cause significant drug interactions by increasing serum concentrations of medications metabolized by this pathway, including statins, certain benzodiazepines, and some antiarrhythmic.
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Transcript
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| 0:00.0 | Hey, all, welcome back to the real-life pharmacology podcast. I'm your host, pharmacist, Derek Christensen. |
| 0:05.3 | Thank you so much for listening today. As always, go check out real-life pharmacology.com. We got that |
| 0:11.7 | free 31-page PDF on the top 200 drugs. Simply an email. We'll get you access to that. |
| 0:17.8 | And of course, support our sponsor, metadata.101.com slash store. We've got tons of |
| 0:22.8 | resources there to help pharmacists studying for board exams, books, all sorts of different content |
| 0:28.5 | that can help lots of different healthcare professionals. So go check that out, Metad101.com |
| 0:33.4 | slash store, support the sponsor and obviously help support this podcast keep it free and |
| 0:39.2 | available for all to benefit from all right the drug of the day today is ketoconazole |
| 0:44.4 | brand name is nizoril as you could expect from the ending ketoconazole this is an |
| 0:51.4 | azole antifungal so it's use typically going to be used for treating fungal infections. |
| 0:58.9 | I can't say I've really seen it used for anything else other than that in clinical practice. |
| 1:05.6 | And its use is pretty rare and I'll discuss the reasons for that coming up here. |
| 1:11.3 | But there are a couple off-label uses that have been reported, advanced prostate cancer, |
| 1:17.1 | as well as Cushing's syndrome. |
| 1:19.9 | So we have an oral formulation as well as a topical formulation. |
| 1:23.6 | So topical formulation we can utilize for cutaneous candidiasis, certain types of dermatitis, tini infection. |
| 1:33.9 | And I want to talk on the mechanism of action a little bit here. |
| 1:37.6 | So essentially as an antifungal, this medication alters the permeability of the fungal cell wall. So it blocks |
| 1:48.1 | fungal cytochrome P-450. In addition to that, it also inhibits biosynthesis of triglycerides and |
| 1:56.8 | phospholipids that are necessary for the fungus to grow and survive. |
| 2:03.2 | Now, I alluded to the off-label use of Cushing's syndrome. |
| 2:07.8 | So this medication actually inhibits some adrenal enzymes that are responsible for cortisol |
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