Ketoconazole is an antifungal medication used to treat a variety of fungal infections. It works by stopping the growth of fungus. Ketoconazole can be used to treat infections such as athlete's foot, jock itch, ringworm, and certain types of dandruff. It is also used to treat fungal infections that have spread throughout the body, including yeast infections of the mouth, throat, esophagus, lungs, and other organs.

Ketoconazole is available in various forms, including tablets, creams, shampoos, and foams. It is typically used for a short period of time to treat acute infections, but in some cases, long-term use may be necessary to prevent recurring infections.

It's important to follow your healthcare provider's instructions when using ketoconazole, as misuse or overuse can lead to resistant fungal infections. Common side effects may include skin irritation, dry skin, or a change in hair texture when used topically. When taken orally, it can also cause gastrointestinal upset or liver problems in rare cases.