Quinidine and Risperidone: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Quinidine interacts with Risperidone

Quinidine strongly inhibits CYP2D6, reducing risperidone metabolism to 9-hydroxyrisperidone and increasing parent-drug exposure. This may increase extrapyramidal symptoms, sedation, and QT-related risk.

What you should do

Use cautiously with dose adjustment and monitoring for adverse effects. Consider ECG monitoring in patients with additional QT risk factors.

Key facts

Severity

Moderate — caution required

Mechanism

Quinidine strongly inhibits CYP2D6, reducing risperidone metabolism to 9-hydroxyrisperidone and increasing parent-drug e...

Action

Use cautiously with dose adjustment and monitoring for adverse effects. Consider ECG monitoring in patients with additio...

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 Quinidine and Risperidone together?

With caution. Use cautiously with dose adjustment and monitoring for adverse effects. Consider ECG monitoring in patients with additional QT risk factors.

What is the severity of this interaction?

The interaction between Quinidine and Risperidone is classified as Moderate — caution required. Quinidine strongly inhibits CYP2D6, reducing risperidone metabolism to 9-hydroxyrisperidone and increasing parent-drug exposure. This may increase extrapyramidal symptoms, sedation, and QT-related risk.

What should I do if I'm prescribed both?

Use cautiously with dose adjustment and monitoring for adverse effects. Consider ECG monitoring in patients with additional QT risk factors. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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