Ketoconazole generally is well tolerated. Commonly reported side effects of ketoconazole are:
- abdominal pain,
- impotence, and
- blood count abnormalities.
Other important side effects of ketoconazole are rare; they include:
- serious allergic reactions (anaphylaxis),
- severe depression,
- hair loss, and
- tingling sensations.
Liver dysfunction also has been reported. Signs of liver problems include unusual fatigue, loss of appetite, nausea and vomiting, yellowing of the skin (jaundice), dark urine, and pale stools. Development of these symptoms while taking ketoconazole should be reported to a physician.