Ketoconazole (Nizoral): Uses, Warnings, and Key Facts
Quick summary Ketoconazole is an antifungal active ingredient known by the brand name Nizoral. The original content describes its use for blastomycosis, chromomycosis, and Cushing syndrome, and highlights important liver-related warnings and drug interactions....
This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.
Quick summary
Ketoconazole is an antifungal active ingredient known by the brand name Nizoral. The original content describes its use for blastomycosis, chromomycosis, and Cushing syndrome, and highlights important liver-related warnings and drug interactions.
Medical disclaimer: This article is for general information only. It does not replace the official product leaflet, a pharmacist’s advice, or guidance from a qualified clinician. Do not use this page to self-diagnose or to change any treatment plan.
What is ketoconazole?
Ketoconazole is an antifungal active ingredient. The current content identifies Nizoral as its brand name.
According to the source material, ketoconazole is used in the treatment of certain fungal infections, including blastomycosis and chromomycosis. It is also listed for Cushing syndrome.
How ketoconazole works
Ketoconazole acts as an antifungal. In practical terms, that means it is used against fungi rather than bacteria or viruses.
If you are checking a specific product, the exact use can depend on the formulation and the official approved leaflet.
Therapeutic uses listed in the source
- Treatment of blastomycosis
- Treatment of chromomycosis
- Treatment for Cushing syndrome
Dosage and administration
The original content only states oral dosage. It does not provide a dose, schedule, or treatment duration.
Because ketoconazole can have important safety considerations, the exact regimen should be verified in the official medication guide or with a healthcare professional.
Important warnings and precautions
- Liver risk: The source warns about hepatotoxicity and says liver function should be checked at baseline and during treatment.
- Stop and seek medical advice if signs of liver damage appear, such as anorexia, nausea, vomiting, fatigue, jaundice, abdominal pain, or dark urine.
- Adrenal function: Monitoring is mentioned for patients with adrenal insufficiency, those undergoing major surgery or intensive care, and those on prolonged therapy.
- Children: The source says it is not recommended in children under 15 kg.
- Liver disease: The content lists acute or chronic liver disease as a contraindication.
Contraindications listed in the source
The original content lists the following situations where ketoconazole should not be used or should be avoided:
- Hypersensitivity
- Acute or chronic liver disease
- Pregnancy and lactation
- Co-administration with certain medicines due to QTc prolongation risk, including terfenadine, sertindole, astemizole, bepridil, disopyramide, halofantrine, levacetylmethadol, mizolastine, cisapride, dofetilide, quinidine, domperidone, and pimozide
- Concomitant use with medicines such as triazolam, midazolam, simvastatin, lovastatin, ergot alkaloids, nisoldipine, eplerenone, irinotecan, and everolimus
Drug interactions
Ketoconazole has many interactions. The source highlights several categories that may reduce its effect, increase its levels, or increase the risk of side effects.
| Interaction type | Examples listed in the source |
|---|---|
| Decreased bioavailability | Rifampicin, rifabutin, carbamazepine, isoniazid, phenytoin |
| Absorption decreased by acid-reducing medicines | Gastric acid reducers, H2-antagonists, proton pump inhibitors |
| Increased bioavailability | Ritonavir |
| Medicines requiring monitoring | Oral anticoagulants, indinavir, saquinavir, vinca alkaloids, busulfan, docetaxel, erlotinib, imatinib, dihydropyridines, verapamil, cyclosporine, tacrolimus, rapamycin, atorvastatin, budesonide, fluticasone, dexamethasone, methylprednisolone, digoxin, carbamazepine, buspirone, alfentanyl, sildenafil, alprazolam, brotizolam, midazolam IV, rifabutin, trimetrexate, elastin, reboxetine, quetiapine, cilostazol, eleptriptan, fentanyl, repaglinide, solifenacin, tolterodine |
| Alcohol | Disulfiram-like effect |
Pregnancy and breastfeeding
The source states that ketoconazole produced developmental effects in rats and that no studies were carried out in pregnant women. It also says ketoconazole is excreted in milk, so women undergoing treatment should not breast-feed.
These points should be reviewed with a clinician using the official product information before any use in pregnancy or while breastfeeding.
Side effects listed in the source
- Nausea
- Headache
- Diarrhea
- Abdominal pain
- Altered liver function
What to verify in the official leaflet
If you are comparing ketoconazole products, check the official leaflet or medication guide for:
- The exact approved use for the specific product
- The formulation and route of administration
- Monitoring requirements
- Interaction warnings for your current medicines
- Pregnancy and breastfeeding guidance
FAQ
▸ What is ketoconazole used for?
The source lists ketoconazole for blastomycosis, chromomycosis, and Cushing syndrome.
▸ Is ketoconazole an antifungal?
Yes. The original content identifies ketoconazole as an antifungal active ingredient.
▸ What are the main safety concerns?
The source emphasizes liver toxicity risk, the need for liver monitoring, and multiple drug interactions.
▸ Can ketoconazole be used in pregnancy or breastfeeding?
The source lists pregnancy and lactation as contraindications and says ketoconazole is excreted in milk. This should be reviewed with a clinician.
▸ Why are drug interactions important with ketoconazole?
Ketoconazole can affect many medicines, including some that may raise heart rhythm risk or increase toxicity. The official leaflet should always be checked.
Safety reminder: Ketoconazole has important liver and interaction warnings. Before using any product containing ketoconazole, confirm the exact indication, route, and precautions in the official medication guide or with a pharmacist or doctor.
Source references in the original content included FDA/USP-related identifiers and public drug databases. For the most accurate product-specific information, consult the official FDA medication guide and the product label.
Medical disclaimer
This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.
Sources and verification
The following sources or official references are listed to support verification of the medicine information discussed in this article.
Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.