Drug interactions
Metoclopramide intranasal + Thioridazine
Severity: Major
Metoclopramide intranasal and Thioridazine: 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
Thioridazine strongly inhibits CYP2D6, increasing metoclopramide exposure, and both drugs block dopamine D2 receptors. This raises the risk of extrapyramidal symptoms, tardive dyskinesia and neuroleptic malignant syndrome.
What this interaction means in plain words
Metoclopramide intranasal and Thioridazine 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.
Why it happens
CYP2D6 inhibition by thioridazine raises metoclopramide levels, with additive D2 receptor antagonism.
What to do
Avoid the combination, since the intranasal dose cannot be adjusted; use an alternative antiemetic such as ondansetron if QT risk allows or a non-dopamine-blocking option. Monitor for movement disorders if exposure occurs.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Metoclopramide intranasal with Thioridazine?
MediHelp rates the interaction as major. Metoclopramide intranasal and Thioridazine 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. Thioridazine strongly inhibits CYP2D6, increasing metoclopramide exposure, and both drugs block dopamine D2 receptors. This raises the risk of extrapyramidal symptoms, tardive dyskinesia and neuroleptic malignant syndrome.
How serious is the interaction between Metoclopramide intranasal and Thioridazine?
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 the combination, since the intranasal dose cannot be adjusted; use an alternative antiemetic such as ondansetron if QT risk allows or a non-dopamine-blocking option. Monitor for movement disorders if exposure occurs.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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