Drug interactions
Disopyramide + Moxifloxacin
Severity: Contraindicated
Disopyramide and Moxifloxacin: 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 the QT interval, and combined use raises the risk of torsades de pointes and other serious ventricular arrhythmias. Disopyramide is a class Ia antiarrhythmic with notable proarrhythmic potential.
What this interaction means in plain words
Disopyramide and Moxifloxacin 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.
Disopyramide belongs to Cardiovascular; Moxifloxacin belongs to Anti Bacterial.
Why it happens
Additive blockade of cardiac potassium channels (hERG) causing delayed repolarization and QT prolongation.
What to do
Avoid the combination and choose a non-QT-prolonging antibacterial such as a beta-lactam. If unavoidable, ECG and electrolyte monitoring are essential.
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 Moxifloxacin
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
- Ibutilide + Moxifloxacin Contraindicated
Other interactions of Disopyramide
- Amisulpride + Disopyramide Contraindicated
- Desipramine + Disopyramide Contraindicated
- Disopyramide + Dronedarone Contraindicated
- Disopyramide + Itraconazole Contraindicated
- Disopyramide + Ketoconazole Contraindicated
- Disopyramide + Maprotiline Contraindicated
Frequently asked questions
Can I take Disopyramide with Moxifloxacin?
MediHelp rates the interaction as contraindicated. Disopyramide and Moxifloxacin 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 the QT interval, and combined use raises the risk of torsades de pointes and other serious ventricular arrhythmias. Disopyramide is a class Ia antiarrhythmic with notable proarrhythmic potential.
How serious is the interaction between Disopyramide and Moxifloxacin?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and choose a non-QT-prolonging antibacterial such as a beta-lactam. If unavoidable, ECG and electrolyte monitoring are essential.
What other medicines interact with Moxifloxacin?
MediHelp also lists interactions of Moxifloxacin with, for example, Amiodarone, Arsenic trioxide, Dofetilide. The full list is on the Moxifloxacin page.
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