Drug interactions
Amiloride + Atenolol-chlorthalidone
Severity: Moderate
Amiloride and Atenolol-chlorthalidone: 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
Amiloride is a potassium-sparing diuretic that raises potassium, and beta-blockers like atenolol can impair cellular potassium uptake. Chlorthalidone offsets this by promoting potassium loss, so the net effect varies and hyperkalemia can still occur, especially with renal impairment. Hyponatremia and hypotension are also possible.
What this interaction means in plain words
Amiloride and Atenolol-chlorthalidone 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.
Amiloride belongs to Cardiovascular; Atenolol-chlorthalidone belongs to Cardiovascular.
Why it happens
Opposing potassium effects: amiloride blocks renal ENaC and retains potassium, atenolol reduces cellular uptake, and chlorthalidone increases renal loss.
What to do
Monitor serum potassium, sodium and renal function after starting and periodically thereafter; be most cautious in diabetes, elderly patients and renal impairment.
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 Amiloride
- Amiloride + Eplerenone Contraindicated
- Amiloride + Spironolactone Contraindicated
- Amiloride + Triamterene Contraindicated
- Aceclofenac + Amiloride Major
- Acemetacin + Amiloride Major
- Amiloride + Amlodipine-benazepril Major
Frequently asked questions
Can I take Amiloride with Atenolol-chlorthalidone?
MediHelp rates the interaction as moderate. Amiloride and Atenolol-chlorthalidone 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. Amiloride is a potassium-sparing diuretic that raises potassium, and beta-blockers like atenolol can impair cellular potassium uptake. Chlorthalidone offsets this by promoting potassium loss, so the net effect varies and hyperkalemia can still occur, especially with renal impairment. Hyponatremia and hypotension are also possible.
How serious is the interaction between Amiloride and Atenolol-chlorthalidone?
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, sodium and renal function after starting and periodically thereafter; be most cautious in diabetes, elderly patients and renal impairment.
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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