Does ondansetron or granisetron prevent subarachnoid morphine-induced pruritus after cesarean delivery?

Background: We compared the efficacy of granisetron and ondansetron for the prevention of subarachnoid morphine-induced pruritus after cesarean delivery.

Methods: The incidence of pruritus was assessed in parturients who were randomly allocated into Group G (granisetron 3 mg IV, n = 45), Group O (ondansetron 8 mg IV, n = 42), and Group S (saline IV, n = 42).

Results: The incidence of pruritus was not significantly different among the 3 groups (86.