Drug interactions
Amiloride + Chlorthalidone
Severity: Moderate
Amiloride and 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
Chlorthalidone wastes potassium while amiloride retains it, so the combination is often used to keep serum potassium stable. Individual response varies, and either hypokalemia or hyperkalemia can occur, especially with renal impairment or diabetes.
What this interaction means in plain words
Amiloride and 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; Chlorthalidone belongs to Cardiovascular.
Why it happens
Opposing effects on renal potassium handling: thiazide-like increased distal potassium excretion versus amiloride ENaC blockade reducing potassium secretion.
What to do
Check serum potassium and renal function within the first weeks of therapy and periodically afterwards. Avoid potassium supplements unless hypokalemia is documented.
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 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 Chlorthalidone?
MediHelp rates the interaction as moderate. Amiloride and 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. Chlorthalidone wastes potassium while amiloride retains it, so the combination is often used to keep serum potassium stable. Individual response varies, and either hypokalemia or hyperkalemia can occur, especially with renal impairment or diabetes.
How serious is the interaction between Amiloride and 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: Check serum potassium and renal function within the first weeks of therapy and periodically afterwards. Avoid potassium supplements unless hypokalemia is documented.
What other medicines interact with Chlorthalidone?
MediHelp also lists interactions of Chlorthalidone with, for example, Amifostine, Atenolol-chlorthalidone, Candesartan-hydrochlorothiazide. The full list is on the Chlorthalidone page.
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