Drug interactions
Chloroquine + Ponesimod
Severity: Major
Chloroquine and Ponesimod: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Ponesimod slows heart rate at treatment initiation and chloroquine prolongs the QT interval. Bradycardia increases susceptibility to torsades de pointes, so the combination can raise arrhythmia risk.
What this interaction means in plain words
Chloroquine and Ponesimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Chloroquine belongs to Anti Parasitic; Ponesimod belongs to Central Nervous System.
Why it happens
Sphingosine-1-phosphate receptor modulation causes bradycardia, which combined with chloroquine-induced QT prolongation increases proarrhythmic risk.
What to do
Avoid starting ponesimod in patients taking QT-prolonging drugs unless a cardiologist has reviewed the case. If used, perform ECG before initiation and monitor heart rate and QTc.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Chloroquine
- Chloroquine + Cisapride Contraindicated
- Chloroquine + Dofetilide Contraindicated
- Chloroquine + Dronedarone Contraindicated
- Chloroquine + Droperidol Contraindicated
- Chloroquine + Panobinostat Contraindicated
- Chloroquine + Pimozide Contraindicated
Other interactions of Ponesimod
- Fingolimod + Ponesimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Amiodarone + Ponesimod Major
- Amisulpride + Ponesimod Major
- Anagrelide + Ponesimod Major
- Anti-thymocyte + Ponesimod Major
Frequently asked questions
Can I take Chloroquine with Ponesimod?
MediHelp rates the interaction as major. Chloroquine and Ponesimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Ponesimod slows heart rate at treatment initiation and chloroquine prolongs the QT interval. Bradycardia increases susceptibility to torsades de pointes, so the combination can raise arrhythmia risk.
How serious is the interaction between Chloroquine and Ponesimod?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid starting ponesimod in patients taking QT-prolonging drugs unless a cardiologist has reviewed the case. If used, perform ECG before initiation and monitor heart rate and QTc.
What other medicines interact with Chloroquine?
MediHelp also lists interactions of Chloroquine with, for example, Cisapride, Dofetilide, Dronedarone. The full list is on the Chloroquine page.
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