Paper II
2023 July (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

Metoclopramide / Domperidone for vomiting in a Parkinsonism patient on Levo Dopa. Name the following (Two examples for each) : (8x1=8)

Q140.2 marksShort Answers

Answer

Domperidone is the appropriate choice — it does not cross the blood-brain barrier appreciably, so it provides antiemetic D2-blocking action at the chemoreceptor trigger zone without antagonizing central dopaminergic transmission. Metoclopramide crosses the blood-brain barrier and would directly antagonize levodopa’s central dopaminergic effect, worsening this patient’s parkinsonism and precipitating extrapyramidal symptoms — making it contraindicated in a patient on levodopa therapy.

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