What drug can you administer for casualties that have severe nausea or vomiting?

Ondanestron, commonly known by its brand name Zofran, is an antiemetic medication specifically indicated for the management of severe nausea and vomiting. This drug works by blocking the actions of chemicals in the body that can trigger nausea and vomiting, especially those associated with chemotherapy, radiation therapy, and surgery.

Due to its efficacy and safety profile, ondansetron is favored in tactical situations where maintaining a casualty's hydration and ability to consume fluids can be crucial to overall care. It is particularly useful for patients who may be experiencing nausea due to trauma or other medical conditions.

In contrast, although other options listed have uses in managing nausea and vomiting, ondansetron is often preferred in acute settings because of its specific mechanism of action on serotonin receptors, which effectively suppresses the vomiting reflex.