Quetiapine and Rifampicin: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Quetiapine and Rifampicin unless specifically directed by your doctor.
How Quetiapine interacts with Rifampicin
Rifampicin is a potent CYP3A4 inducer that reduces quetiapine plasma concentrations by up to 80%, leading to loss of antipsychotic efficacy.
What you should do
Increase quetiapine dose up to 5-fold during rifampicin therapy with monitoring, and reduce back to baseline within 1-2 weeks of stopping rifampicin.
Key facts
Severity
Major — avoid combination
Mechanism
Rifampicin is a potent CYP3A4 inducer that reduces quetiapine plasma concentrations by up to 80%, leading to loss of ant...
Action
Increase quetiapine dose up to 5-fold during rifampicin therapy with monitoring, and reduce back to baseline within 1-2 ...
Frequently asked questions
Can I take Quetiapine and Rifampicin together?
No — this combination should generally be avoided. Increase quetiapine dose up to 5-fold during rifampicin therapy with monitoring, and reduce back to baseline within 1-2 weeks of stopping rifampicin.
What is the severity of this interaction?
The interaction between Quetiapine and Rifampicin is classified as Major — avoid combination. Rifampicin is a potent CYP3A4 inducer that reduces quetiapine plasma concentrations by up to 80%, leading to loss of antipsychotic efficacy.
What should I do if I'm prescribed both?
Increase quetiapine dose up to 5-fold during rifampicin therapy with monitoring, and reduce back to baseline within 1-2 weeks of stopping rifampicin. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.