BEKINDA (Ondansetron 24 mg Bimodal Release Tablets) for Vomiting Due to Presumed Acute Gastroenteritis or Gastritis

Inclusion Criteria: * Patients must have vomited at least twice in the 4 hours preceding signing informed consent. A vomiting episode is defined as an episode of forceful expulsion of stomach contents. Retching if a patient has already emptied his or her gastric contents is also considered vomiting episode. A distinct episode is characterized by a clear break in vomiting activity of at least 5 minutes * Emesis must have been nonbloody (streaks of blood presumed due to force of retching are allowed) * All patients (and a parent or guardian for patients \<age 18) must sign informed consent. Exclusion Criteria: * Severe dehydration. Severe dehydration is defined as two or more of the following criteria in the presence of decreased intake and increased output due to vomiting or diarrhea: Absent or severely decreased urine output; weak pulse and/or low blood pressure; parched mucous membranes; lethargy, confusion, delirium or loss of consciousness * Signs and symptoms severe enough to require immediate parenteral hydration and/or parenteral antiemetic medication * Temperature\>39.0 * Likely etiologies for acute vomiting and diarrhea other than acute infectious or toxic gastroenteritis or gastritis. This includes signs of an acute abdomen, which may require surgical intervention * Chemically-induced gastroenteritis, e.g., from alcohol, other drugs of abuse or other irritant chemicals * Use within 24 hours of study entry of specific medication for treatment of nausea and/or vomit…