Ketoconazole is an antifungal medication used to treat a variety of fungal infections. It works by disrupting the cell membrane of the fungi, thereby stopping its growth and killing the infection. It is commonly prescribed for skin infections like athlete's foot, ringworm, and jock itch, as well as fungal infections of the nails and scalp. Ketoconazole is available in various forms such as creams, shampoos, and oral tablets, depending on the type of infection. Common side effects include nausea, vomiting, abdominal pain, increased liver enzymes, application site redness, itching, diarrhea, abnormal liver function tests, adrenal insufficiency, and burning sensations at the site of application. It's important to follow your healthcare provider's instructions and report any persistent or severe side effects.