IMPLICATIONS: We compared the postoperative antiemetic efficacy of scopolamine, ondansetron, and placebo in patients receiving intrathecal morphine undergoing cesarean delivery. The rates of all emesis were reduced by one-third by transdermal scopolamine (TDS) or ondansetron. Scopolamine is an effective medication for prophylactic use in these parturients. Its use, however, was associated with a higher incidence of side effects such as dry mouth and blurry vision.
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