Final answer:
Ondansetron, marketed as Zofran, is an anti-emetic controlled substance used under medical directive to prevent nausea and vomiting due to chemotherapy, radiation, or surgery, and may be used in cases of acute gastroenteritis-like symptoms with severe dehydration.
Step-by-step explanation:
The conditions for ondansetron under the Nausea/Vomiting Medical Directive typically pertain to its use as an anti-emetic to prevent nausea and vomiting associated with factors such as cancer chemotherapy, radiation therapy, or surgery. Ondansetron, commonly known by the brand name Zofran, is administered to manage acute gastroenteritis-like symptoms, which are characterized by bouts of emesis, diarrhea, abdominal pain, and severe dehydration, as seen in the spike at a hospital in western Florida. The drug is a controlled substance and is carefully regulated when used in a medical setting, often with specific usage guidelines to ensure patient safety and efficacy.