Hypersensitivity to itraconazole or other azole antifungals. For treatment of onychomycosis in patients w/ evidence of ventricular dysfunction (eg, CHF or history of CHF). Co-administration w/ CYP3A4 substrates eg, methadone, disopyramide, dofetilide, dronedarone, quinidine, ergot alkaloids [eg, dihydroergotamine, ergometrine (ergonovine), ergotamine, methylergometrine (methylergonovine)], irinotecan, lurasidone, oral midazolam, pimozide, triazolam, felodipine, nisoldipine, ranolazine, eplerenone, cisapride, lovastatin, simvastatin &, in subjects w/ renal or hepatic impairment, colchicine. For treatment of onychomycosis to pregnant patients or women contemplating pregnancy.