Drug interactions
Procainamide + Triamterene
Severity: Moderate
Procainamide and Triamterene: 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
Both drugs are cationic and secreted by renal tubular transporters, so they may compete for elimination. Procainamide accumulation can cause QRS or QT prolongation and arrhythmias, particularly with renal impairment.
What this interaction means in plain words
Procainamide and Triamterene 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
Competition for renal tubular cationic secretion (OCT/MATE transporters).
What to do
Monitor ECG, procainamide and NAPA concentrations, and renal function; reduce procainamide dose if levels rise.
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 Triamterene
- Amiloride + Triamterene Contraindicated
- Eplerenone + Triamterene Contraindicated
- Potassium citrate / citric acid + Triamterene Contraindicated
- Potassium citrate + Triamterene Contraindicated
- Spironolactone + Triamterene Contraindicated
- Aceclofenac + Triamterene Major
Frequently asked questions
Can I take Procainamide with Triamterene?
MediHelp rates the interaction as moderate. Procainamide and Triamterene 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. Both drugs are cationic and secreted by renal tubular transporters, so they may compete for elimination. Procainamide accumulation can cause QRS or QT prolongation and arrhythmias, particularly with renal impairment.
How serious is the interaction between Procainamide and Triamterene?
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, procainamide and NAPA concentrations, and renal function; reduce procainamide dose if levels rise.
What other medicines interact with Triamterene?
MediHelp also lists interactions of Triamterene with, for example, Amiloride, Eplerenone, Potassium citrate / citric acid. The full list is on the Triamterene page.
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