Dofetilide and Ponesimod: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Dofetilide
Ponesimod
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
Increased risk of bradycardia, an increased risk of QT interval prolongation and torsades de pointes
Interaction Deep Dive
Concomitant administration of ponesimod and Class III antiarrhythmic drugs that prolong the QT interval is not recommended due to potential additive effects on heart rate, including torsades de pointes in patients with bradycardia. If treatment with ponesimod is considered, advice from a cardiologist should be sought1.
Why it happens (mechanism)
Additive effects on heart rate; additive QT interval prolongation
Common questions
Can I take Dofetilide and Ponesimod together?
Increased risk of bradycardia, an increased risk of QT interval prolongation and torsades de pointes Always confirm with your pharmacist or prescriber before making any change.
How serious is the Dofetilide and Ponesimod interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Dofetilide or Ponesimod 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 (1)
- Product Information: PONVORY(R) oral tablets, ponesimod oral tablets. Janssen Pharmaceuticals Inc (per FDA), Titusville, NJ, 2024. DailyMed
Keep reading about Dofetilide
Keep reading about Ponesimod
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.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist