- Requiring therapy with rifampin, rifabutin, carbamazepine, cisapride (Propulsid®), terfenadine (Seldane®), astemizole (Hismanal®), ergot alkaloids, long-acting barbiturates, or who have received more than 3 days treatment with rifampin or carbamazepine within 7 days prior to conditioning regimen initiation. Patients on therapeutic anticoagulation with coumadin (1 mg/day for port prophylaxis is permitted)