Aprepitant in Preventing Nausea and Vomiting in Patients Who Are Undergoing a Stem Cell Transplant

Loading dose of 125 mg capsule once a day for one day, then maintenance dose of 80 mg capsule daily through Day +4 of Bone Marrow Transplant

For Cyclophosphamide Total Body Irradiation(CyTBI) patients: Dexamethasone study drug 1 capsule PO daily, 1 hour prior to chemotherapy with aprepitant on total body irradiation(TBI) and cyclophosphamide chemotherapy days; For Busulfan Cyclophosphamide(BuCy) patients: Dexamethasone 1 capsule orally once daily, discontinue after last dose of chemotherapy.

For CyTBI patients: Ondansetron 8 mg orally evert 12 hours, begin 1 hour prior to first TBI dose and discontinue after last dose; then Ondansetron 8 mg IV every 12 hours X 4 doses, begin 30 minutes prior to first cyclophosphamide chemotherapy; For BuCy patients: Ondansetron 8 mg orally every 6 hours, begin 1 hour prior to first busulfan dose and discontinue after last busulfan dose is given. then: Ondansetron 8 mg IV Q 12 hours X 4 doses, begin 30 minutes prior to first cyclophosphamide chemotherapy

Loading dose of 125 mg capsule once a day for one day, then maintenance dose of 80 mg capsule daily through Day +4 of Bone Marrow Transplant