Drug interactions
Atenolol-chlorthalidone + Triamterene
Severity: Moderate
Atenolol-chlorthalidone 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
Triamterene is a potassium-sparing diuretic that can cause hyperkalemia, and atenolol may add slightly to this by reducing cellular potassium uptake. Chlorthalidone causes potassium loss and partly counteracts it, but the net effect is unpredictable. Hyperkalemia can be dangerous in renal impairment.
What this interaction means in plain words
Atenolol-chlorthalidone 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.
Atenolol-chlorthalidone belongs to Cardiovascular; Triamterene belongs to Cardiovascular.
Why it happens
Triamterene blocks renal epithelial sodium channels, reducing potassium excretion, while beta-blockade impairs cellular potassium uptake and thiazide-type diuresis opposes the effect.
What to do
Monitor serum potassium and creatinine at baseline, within the first weeks and periodically afterwards. Avoid potassium supplements and reassess triamterene if potassium rises.
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 Atenolol-chlorthalidone
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 Atenolol-chlorthalidone with Triamterene?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone 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. Triamterene is a potassium-sparing diuretic that can cause hyperkalemia, and atenolol may add slightly to this by reducing cellular potassium uptake. Chlorthalidone causes potassium loss and partly counteracts it, but the net effect is unpredictable. Hyperkalemia can be dangerous in renal impairment.
How serious is the interaction between Atenolol-chlorthalidone 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 serum potassium and creatinine at baseline, within the first weeks and periodically afterwards. Avoid potassium supplements and reassess triamterene if potassium rises.
What other medicines interact with Atenolol-chlorthalidone?
MediHelp also lists interactions of Atenolol-chlorthalidone with, for example, Acebutolol, Aldesleukin, Amiodarone. The full list is on the Atenolol-chlorthalidone page.
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