Drug interactions
Dofetilide + Quinidine
Severity: Contraindicated
Dofetilide and Quinidine: contraindicated 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
Both drugs prolong cardiac repolarization, and concurrent use raises the risk of torsades de pointes and sudden death. Quinidine may also reduce renal clearance of dofetilide, increasing its exposure.
What this interaction means in plain words
Dofetilide and Quinidine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Dofetilide belongs to Cardiovascular; Quinidine belongs to Anti Parasitic.
Why it happens
Additive potassium channel blockade causing QT prolongation, with possible reduced renal elimination of dofetilide.
What to do
Do not coadminister; allow adequate washout of the first antiarrhythmic before starting the other, under ECG monitoring.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Quinidine
- Adagrasib + Quinidine Contraindicated
- Arsenic trioxide + Quinidine Contraindicated
- Artemether / lumefantrine + Quinidine Contraindicated
- Chloroquine + Quinidine Contraindicated
- Dronedarone + Quinidine Contraindicated
- Droperidol + Quinidine Contraindicated
Other interactions of Dofetilide
- Amiodarone + Dofetilide Contraindicated
- Amisulpride + Dofetilide Contraindicated
- Amlodipine-hydrochlorothiazide-valsartan + Dofetilide Contraindicated
- Amlodipine-olmesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Captopril-hydrochlorothiazide + Dofetilide Contraindicated
Frequently asked questions
Can I take Dofetilide with Quinidine?
MediHelp rates the interaction as contraindicated. Dofetilide and Quinidine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Both drugs prolong cardiac repolarization, and concurrent use raises the risk of torsades de pointes and sudden death. Quinidine may also reduce renal clearance of dofetilide, increasing its exposure.
How serious is the interaction between Dofetilide and Quinidine?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not coadminister; allow adequate washout of the first antiarrhythmic before starting the other, under ECG monitoring.
What other medicines interact with Quinidine?
MediHelp also lists interactions of Quinidine with, for example, Adagrasib, Arsenic trioxide, Artemether / lumefantrine. The full list is on the Quinidine page.
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