Quetiapine and Ritonavir: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Quetiapine and Ritonavir unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Quetiapine interacts with Ritonavir

Ritonavir strongly inhibits CYP3A4, dramatically increasing quetiapine exposure with risk of sedation, orthostatic hypotension and QT prolongation.

What you should do

Combination is generally contraindicated; if essential, reduce quetiapine to one-sixth of usual dose and monitor closely with ECG.

Key facts

Severity

Major — avoid combination

Mechanism

Ritonavir strongly inhibits CYP3A4, dramatically increasing quetiapine exposure with risk of sedation, orthostatic hypot...

Action

Combination is generally contraindicated; if essential, reduce quetiapine to one-sixth of usual dose and monitor closely...

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 Quetiapine and Ritonavir together?

No — this combination should generally be avoided. Combination is generally contraindicated; if essential, reduce quetiapine to one-sixth of usual dose and monitor closely with ECG.

What is the severity of this interaction?

The interaction between Quetiapine and Ritonavir is classified as Major — avoid combination. Ritonavir strongly inhibits CYP3A4, dramatically increasing quetiapine exposure with risk of sedation, orthostatic hypotension and QT prolongation.

What should I do if I'm prescribed both?

Combination is generally contraindicated; if essential, reduce quetiapine to one-sixth of usual dose and monitor closely with ECG. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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