4. Patients receiving any medication that is contraindicated with the use of voriconazole. Voriconazole is contraindicated with the co-administration of the following drugs:sirolimus, terfenadine, astemizole, cisapride, pimozide, quinidine, ergot alkaloids, rifabutin, rifampin, high-dose ritonavir (400 mg Q12h), carbamazepine, long-acting barbiturates, efavirenz (with standard dose vfend and efavirenz), St. John's Wort.