Management of Radiation-Induced Nausea

Introduction to Guidelines

The American Society of Clinical Oncology (ASCO) recommends 5-HT3 antagonists, such as Ondansetron or Granisetron, as the preferred agents for all risk grades of radiation therapy 1, 2, 3

For high-risk radiation-induced nausea (>90%), the ASCO and MASCC/ESMO guidelines recommend a 5-HT3 antagonist before each fraction throughout the entire radiation therapy and for at least 24 hours after completion 1, 3
For high-risk radiation-induced nausea (>90%), Dexamethasone 4 mg orally or intravenously is recommended during fractions 1-5 3, 4
For moderate-risk radiation-induced nausea (60-90%), a 5-HT3 antagonist is recommended before each fraction throughout the radiation therapy 2, 5
For moderate-risk radiation-induced nausea (60-90%), optional Dexamethasone 4 mg can be used during fractions 1-5 5, 6
For low-risk radiation-induced nausea (30-60%), a 5-HT3 antagonist can be used either prophylactically or as rescue therapy 3, 4
For minimal-risk radiation-induced nausea (<30%), rescue therapy with Dopamine receptor antagonists or 5-HT3 antagonists is recommended 2, 4

Domperidone, a Dopamine receptor antagonist, is not explicitly mentioned in the current ASCO, MASCC, or ESMO guidelines for radiation-induced nausea 1, 2, 3, 4, 5, 6
Metoclopramide (20 mg oral) and Prochlorperazine (10 mg oral or intravenous) are preferred Dopamine antagonists 3, 4

If a patient develops nausea despite 5-HT3 antagonist use, other causes such as constipation, electrolyte imbalances, hypercalcemia, or CNS metastases should be excluded 7, 10
Metoclopramide 10-20 mg orally three times a day can be added (not replaced) 7, 8
Alternative Dopamine antagonists such as Prochlorperazine 5-10 mg orally or intravenously, or Haloperidol 0.5-1 mg every 6-8 hours can be used 8, 10
Dexamethasone 4 mg can be added if not already used 7, 10

Domperidone is not evidence-based for radiation-induced nausea 1, 2, 3, 4, 5
Metoclopramide is the preferred Dopamine antagonist in guidelines due to its additional prokinetic effects 8, 10
5-HT3 antagonists should not be simply repeated if they fail; instead, an agent with a different mechanism of action should be added 10
In older patients, reduced doses of all antiemetics should be used (Metoclopramide 5-10 mg instead of 10-20 mg) 10