Drug interactions
Carbidopa + Metoclopramide
Severity: Major
Carbidopa and Metoclopramide: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Metoclopramide speeds gastric emptying and may increase levodopa absorption, but its central dopamine blockade can worsen parkinsonism and oppose levodopa effect.
What this interaction means in plain words
Carbidopa and Metoclopramide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Carbidopa belongs to Central Nervous System; Metoclopramide belongs to Gastrointestinal Tract.
Why it happens
Central D2 receptor antagonism opposes levodopa, while enhanced gastric emptying increases its absorption.
What to do
Avoid metoclopramide in Parkinson's disease; use domperidone where available or another antiemetic without central D2 blockade.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Carbidopa
Other interactions of Metoclopramide
Frequently asked questions
Can I take Carbidopa with Metoclopramide?
MediHelp rates the interaction as major. Carbidopa and Metoclopramide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Metoclopramide speeds gastric emptying and may increase levodopa absorption, but its central dopamine blockade can worsen parkinsonism and oppose levodopa effect.
How serious is the interaction between Carbidopa and Metoclopramide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid metoclopramide in Parkinson's disease; use domperidone where available or another antiemetic without central D2 blockade.
What other medicines interact with Carbidopa?
MediHelp also lists interactions of Carbidopa with, for example, Amlodipine-atorvastatin, Amlodipine-benazepril, Amlodipine-hydrochlorothiazide-valsartan. The full list is on the Carbidopa page.
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