Drug interactions
Atenolol-chlorthalidone + Chlorthalidone
Severity: Major
Atenolol-chlorthalidone and Chlorthalidone: major 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
The combination product already contains chlorthalidone, so adding more duplicates diuretic therapy. This increases the risk of volume depletion, hypotension, hypokalemia, hyponatremia and hyperuricemia.
What this interaction means in plain words
Atenolol-chlorthalidone and Chlorthalidone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Atenolol-chlorthalidone belongs to Cardiovascular; Chlorthalidone belongs to Cardiovascular.
Why it happens
Therapeutic duplication of thiazide-like diuretic activity causing additive natriuresis and potassium loss.
What to do
Avoid concurrent use; prescribe a single chlorthalidone source and monitor electrolytes and blood pressure if doses are adjusted.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Atenolol-chlorthalidone
Other interactions of Chlorthalidone
Frequently asked questions
Can I take Atenolol-chlorthalidone with Chlorthalidone?
MediHelp rates the interaction as major. Atenolol-chlorthalidone and Chlorthalidone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. The combination product already contains chlorthalidone, so adding more duplicates diuretic therapy. This increases the risk of volume depletion, hypotension, hypokalemia, hyponatremia and hyperuricemia.
How serious is the interaction between Atenolol-chlorthalidone and Chlorthalidone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use; prescribe a single chlorthalidone source and monitor electrolytes and blood pressure if doses are adjusted.
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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