Metoclopramide and Promethazine: Drug Interaction Guide

Quick answer: This combination requires caution. Metoclopramide and Promethazine can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Metoclopramide interacts with Promethazine

Both drugs block central dopamine pathways and can produce additive extrapyramidal adverse effects and sedation. Risk is higher in older adults and patients with Parkinsonism.

What you should do

Avoid routine combined use. If needed short term, use the lowest effective doses and monitor for dystonia, akathisia, sedation, and falls.

Key facts

Severity

Moderate — caution required

Mechanism

Both drugs block central dopamine pathways and can produce additive extrapyramidal adverse effects and sedation. Risk is...

Action

Avoid routine combined use. If needed short term, use the lowest effective doses and monitor for dystonia, akathisia, se...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Metoclopramide and Promethazine together?

With caution. Avoid routine combined use. If needed short term, use the lowest effective doses and monitor for dystonia, akathisia, sedation, and falls.

What is the severity of this interaction?

The interaction between Metoclopramide and Promethazine is classified as Moderate — caution required. Both drugs block central dopamine pathways and can produce additive extrapyramidal adverse effects and sedation. Risk is higher in older adults and patients with Parkinsonism.

What should I do if I'm prescribed both?

Avoid routine combined use. If needed short term, use the lowest effective doses and monitor for dystonia, akathisia, sedation, and falls. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.