Drug interactions
Flecainide + Sodium citrate / citric acid
Severity: Moderate
Flecainide and Sodium citrate / citric acid: 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
Citrate is metabolized to bicarbonate and can alkalinize the urine, which lowers renal excretion of flecainide. Higher flecainide exposure may increase the risk of conduction abnormalities and arrhythmias.
What this interaction means in plain words
Flecainide and Sodium citrate / citric acid 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
Urinary alkalinization increases passive tubular reabsorption of flecainide, reducing renal clearance.
What to do
Monitor ECG and consider flecainide levels when citrate is used regularly. Reduce flecainide dose if signs of toxicity appear.
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 Sodium citrate / citric acid?
MediHelp rates the interaction as moderate. Flecainide and Sodium citrate / citric acid 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. Citrate is metabolized to bicarbonate and can alkalinize the urine, which lowers renal excretion of flecainide. Higher flecainide exposure may increase the risk of conduction abnormalities and arrhythmias.
How serious is the interaction between Flecainide and Sodium citrate / citric acid?
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 consider flecainide levels when citrate is used regularly. Reduce flecainide dose if signs of toxicity appear.
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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