Caution: Ketaconazole and fluconazole are potent inhibitors of the hepatic microsomal enzyme system CYP3A4. As such, drug interactions must be anticipated in patients concurrently taking anticoagulant, antihistamine, antianxiety, and cholesterol-lowering medications. If patients fail to respond to systemic therapy, they should be referred to an infectious disease specialist for evaluation of resistant strains or the diagnosis must be reevaluated