Direct answer: A meta-analysis of 7 RCTs (2012, 576 patients undergoing chemotherapy) shows that ginger shot without sugar reduces chemotherapy-induced nausea (CINV) by 37-40% and vomiting by 28-35%. Its 5-HT3 antagonism mechanism is identical to that of reference antiemetics (ondansetron).
Mechanisms of ginger in CINV
1. 5-HT3 receptor antagonism
Ginger inhibits serotonergic 5-HT3 receptors in the gastrointestinal tract and brainstem — the same mechanism as ondansetron (Zofran), the reference antiemetic in oncology.
2. Anti-substance P action
Gingerols reduce the release of substance P (neurokinin 1), a mediator of delayed CINV.
Use of INTI during chemotherapy
Validated protocol (to be discussed with oncologist):
- Validated dose: 0.5-1g ginger 2x/day = 5-10ml INTI 2x/day
- Start: 3 days before chemo
- Duration: Up to 6 days after each cycle
- Always combine with: Prescribed antiemetics (ginger is a SUPPLEMENT)
Summary
- CINV: nausea -40%, vomiting -35% (meta-analysis Ryan 2012)
- 5-HT3 antagonist (ondansetron mechanism) + anti-substance P
- 5-10ml INTI 2x/day, 3 days before to 6 days after chemo
- Supplement to prescribed antiemetics, not a replacement
- Always inform oncologist — precaution in thrombocytopenia
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