Drug interactions
Flecainide + Tropisetron
Severity: Moderate
Flecainide and Tropisetron: moderate 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
Tropisetron, a 5-HT3 antagonist, may prolong cardiac conduction and QT interval, and flecainide adds proarrhythmic risk. Tropisetron is also metabolized by CYP2D6 so competition may modestly alter exposure.
What this interaction means in plain words
Flecainide and Tropisetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive effects on cardiac conduction and repolarization, with possible CYP2D6 competition.
What to do
Monitor ECG and correct electrolytes when combining. Avoid further QT-prolonging drugs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Frequently asked questions
Can I take Flecainide with Tropisetron?
MediHelp rates the interaction as moderate. Flecainide and Tropisetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tropisetron, a 5-HT3 antagonist, may prolong cardiac conduction and QT interval, and flecainide adds proarrhythmic risk. Tropisetron is also metabolized by CYP2D6 so competition may modestly alter exposure.
How serious is the interaction between Flecainide and Tropisetron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and correct electrolytes when combining. Avoid further QT-prolonging drugs.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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