Fluconazole is used to treat serious fungal or yeast infections, including vaginal candidiasis, oropharyngeal candidiasis (thrush, oral thrush), esophageal candidiasis (candida esophagitis), other candida infections (including urinary tract infections, peritonitis [inflammation of the lining of the stomach], and infections that may occur in different parts of the body), or fungal (cryptococcal) meningitis. It is also used in children on life support called extracorporeal membrane oxygenation (ECMO). This medicine works by killing the fungus or yeast, or preventing its growth.