Ondansetron for Gastroenteritis Management

Recommendations by Age Group

The American College of Physicians recommends ondansetron for children older than 4 years and adolescents with acute gastroenteritis associated with vomiting to facilitate oral rehydration, and it can be considered in adults after adequate hydration is achieved 1, 2, 3
Ondansetron should not be routinely used for acute gastroenteritis in children less than 4 years of age, as recommended by the Infectious Diseases Society of America 1
Antiemetic agents, including ondansetron, can be considered as ancillary treatment in adults once the patient is adequately hydrated, according to the Clinical Infectious Diseases guidelines 1, 3

Ondansetron use is not a substitute for appropriate fluid and electrolyte therapy, as emphasized by the Clinical Infectious Diseases guidelines 1, 4
The Infectious Diseases Society of America notes that ondansetron did not decrease hospitalization rates at 72 hours after discharge from the emergency department 1
Special caution is advised when using ondansetron in children with heart disease due to potential QT interval prolongation, as recommended by the Journal of Allergy and Clinical Immunology 5
Ondansetron is not recommended as first-line therapy in pregnancy during the first trimester, according to Gastroenterology guidelines 6
The Clinical Infectious Diseases guidelines advise that ondansetron should be avoided in patients with suspected inflammatory diarrhea or diarrhea with fever 3