Ketoconazole is used to treat fungal infections of mucous membrane and skin. It stops the growth of fungus. It is also used for the treatment of fungal infection on nails.

Vomiting and nausea are common side effects.

Serious but rare side effects (of the oral dose) are suicidal thoughts, depression, head ache and mood changes. Over dosage and long term use results in a reduction in testosterone and sperm levels.