Encorafenib and Dronedarone: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Dronedarone
Encorafenib
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
An increased risk of QT interval prolongation, increased encorafenib exposure, an increased risk of encorafenib-related adverse reactions, reduced dronedarone exposure and reduced efficacy of dronedarone
Interaction Deep Dive
Coadministration of drugs prolonging the QT interval, such as encorafenib and dronedarone is contraindicated because of the potential risk of torsade de pointes-type ventricular tachycardia2. Concomitant administration may increase encorafenib exposure and may increase risk of encorafenib-related adverse reactions, may also reduce dronedarone exposure and thus reduce efficacy of dronedarone. In a drug interaction study, coadministration of dilTIAZem (a moderate CYP3A4 inhibitor) with encorafenib increased the AUC of encorafenib by 2-fold and increased the Cmax by 45% following a single dose of encorafenib 50 mg (0.1 times the usual dose). In another drug interaction study, repeat dose administration of encorafenib 450 mg once daily and binimetinib 45 mg twice daily with a single dose of midazolam 2 mg, a sensitive CYP3A4 substrate, decreased midazolam AUC by 82% and Cmax by 74% relative to midazolam 2 mg alone 1.
Why it happens (mechanism)
Additive QT interval prolongation; inhibition of CYP3A4-mediated metabolism of encorafenib; induction of CYP3A4-mediated metabolism of dronedarone
Literature reports
2 reports — tap to read
a) In a drug interaction study, coadministration of dilTIAZem (a moderate CYP3A4 inhibitor) with encorafenib increased the AUC of encorafenib by 2-fold and increased the Cmax by 45% following a single dose of encorafenib 50 mg (0.1 times the usual dose) 1.
b) In a drug interaction study, repeat dose administration of encorafenib 450 mg once daily and binimetinib 45 mg twice daily with a single dose of midazolam 2 mg, a sensitive CYP3A4 substrate, decreased midazolam AUC by 82% and Cmax by 74% relative to midazolam 2 mg alone 1.
Common questions
Can I take Encorafenib and Dronedarone together?
An increased risk of QT interval prolongation, increased encorafenib exposure, an increased risk of encorafenib-related adverse reactions, reduced dronedarone exposure and reduced efficacy of dronedarone Always confirm with your pharmacist or prescriber before making any change.
How serious is the Encorafenib and Dronedarone interaction?
It is rated contraindicated. These should generally not be used together.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Encorafenib or Dronedarone need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
Keep reading about Dronedarone
Keep reading about Encorafenib
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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