Nizoral - Drugs Treatments - Revolution HealthKetoconazole is used to treat infections caused by fungus, which can invade any part of the body including the mouth, throat, esophagus, lungs, bladder, or skin.The cost rating is based on the average wholesale price for a drug. The average wholesale price is the suggested selling price for a drug, much like the sticker price on a car. Insurance companies often use this cost as the basis for drug reimbursement. This price does not reflect what you would pay for a drug if covered by your prescription benefit plan. For the ratings system, dollar signs are used to indicate the following price range categories: $ = $25, $$ = $25 to $49, $$$ = $50 to $99, $$$$ = $100 to $199, and $$$$$ = $200.