Ondansetron Administration to Children With Gastroenteritis, Vomiting and SOME Dehydration in EDs in Pakistan

The primary objective is to determine if the administration of a single dose of oral ondansetron (an anti-vomiting medication), compared to placebo, results in a reduction in intravenous (IV) rehydration therapy in children presenting for emergency department care with some dehydration, vomiting and diarrhea in Pakistan. SOME Dehydration is defined as 2 or more of the following signs and symptoms: * Restlessness, irritability * Sunken Eyes * Drinks eagerly, thirsty * Skin pinch goes back slowly