Quetiapine and Voriconazole: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Quetiapine and Voriconazole unless specifically directed by your doctor.
How Quetiapine interacts with Voriconazole
Voriconazole strongly inhibits CYP3A4, markedly increasing quetiapine exposure; both drugs can also contribute to QT prolongation.
What you should do
Avoid the combination when possible. If unavoidable under specialist care, apply the recommended major quetiapine dose reduction and monitor sedation, hypotension, ECG findings, and toxicity.
Key facts
Severity
Major — avoid combination
Mechanism
Voriconazole strongly inhibits CYP3A4, markedly increasing quetiapine exposure; both drugs can also contribute to QT pro...
Action
Avoid the combination when possible. If unavoidable under specialist care, apply the recommended major quetiapine dose r...
Frequently asked questions
Can I take Quetiapine and Voriconazole together?
No — this combination should generally be avoided. Avoid the combination when possible. If unavoidable under specialist care, apply the recommended major quetiapine dose reduction and monitor sedation, hypotension, ECG findings, and toxicity.
What is the severity of this interaction?
The interaction between Quetiapine and Voriconazole is classified as Major — avoid combination. Voriconazole strongly inhibits CYP3A4, markedly increasing quetiapine exposure; both drugs can also contribute to QT prolongation.
What should I do if I'm prescribed both?
Avoid the combination when possible. If unavoidable under specialist care, apply the recommended major quetiapine dose reduction and monitor sedation, hypotension, ECG findings, and toxicity. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.