Erythromycin and Quetiapine: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Erythromycin and Quetiapine unless specifically directed by your doctor.
How Erythromycin interacts with Quetiapine
Erythromycin inhibits CYP3A4, the major metabolic pathway for quetiapine. Higher quetiapine exposure can increase sedation, hypotension, and QT prolongation risk.
What you should do
Avoid the combination when possible. Use a non-macrolide alternative or reduce quetiapine dose with close clinical and ECG monitoring if co-use is unavoidable.
Key facts
Severity
Major — avoid combination
Mechanism
Erythromycin inhibits CYP3A4, the major metabolic pathway for quetiapine. Higher quetiapine exposure can increase sedati...
Action
Avoid the combination when possible. Use a non-macrolide alternative or reduce quetiapine dose with close clinical and E...
Frequently asked questions
Can I take Erythromycin and Quetiapine together?
No — this combination should generally be avoided. Avoid the combination when possible. Use a non-macrolide alternative or reduce quetiapine dose with close clinical and ECG monitoring if co-use is unavoidable.
What is the severity of this interaction?
The interaction between Erythromycin and Quetiapine is classified as Major — avoid combination. Erythromycin inhibits CYP3A4, the major metabolic pathway for quetiapine. Higher quetiapine exposure can increase sedation, hypotension, and QT prolongation risk.
What should I do if I'm prescribed both?
Avoid the combination when possible. Use a non-macrolide alternative or reduce quetiapine dose with close clinical and ECG monitoring if co-use is unavoidable. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.