- The patient's current treatment plan must include an anti-emetic regimen with either ondansetron or granisetron on a scheduled basis. Patients may also receive dexamethasone for antiemetic prophylaxis during the acute phase at the discretion of the treating physician. Patients ≥ 12 years old may also receive aprepitant in conjunction with dexamethasone for antiemetic prophylaxis at the discretion of the treating physician.