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A 71-year-old woman attends the emergency department with 10 hours of vomiting that began after a family barbecue. She has Parkinson disease treated with levodopa and carbidopa. As a teenager, a few hours after an injection given for vomiting, her neck twisted to one side and her eyes rolled upwards for several hours. She is alert and only mildly dehydrated, but cannot keep oral fluids down. An electrocardiogram shows a corrected QT interval of 410 milliseconds. Which one of the following antiemetics is most appropriate for her?
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