Study of the prophylactic effect of droperidol, alizapride, propofol and promethazine on spinal morphine-induced pruritus

Droperidol, propofol and alizapride, in a decreasing order of effectiveness in the doses used in this study, reduced the incidence of pruritus induced by the use of morphine 0.2 mg intrathecally. On the other hand, promethazine 50 mg was shown to be ineffective.