Paper II
2025 August (Supplementary) (2010 Scheme)

Question

Domperidone/ Ondansetron in the treatment of Chemotherapy induced vomiting

Q140.3 marksShort Answers

Answer

Ondansetron is the appropriate choice — chemotherapy damages the intestinal mucosa, triggering enterochromaffin cells to release serotonin, which activates vagal 5-HT3 receptors and the chemoreceptor trigger zone; a 5-HT3 antagonist directly blocks this dominant emetogenic pathway and is first-line for chemotherapy-induced nausea and vomiting. Domperidone, a D2 antagonist, targets a different and comparatively minor pathway for chemotherapy-induced emesis specifically, making it a less effective choice for this indication than for other causes of vomiting.

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