Drug interactions
Atenolol-chlorthalidone + Carbenoxolone
Severity: Major
Atenolol-chlorthalidone and Carbenoxolone: 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
Carbenoxolone causes mineralocorticoid-like sodium and water retention and potassium loss, which can raise blood pressure and oppose the antihypertensive effect. Combined with chlorthalidone, the risk of hypokalemia is considerably increased.
What this interaction means in plain words
Atenolol-chlorthalidone and Carbenoxolone 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.
Why it happens
Carbenoxolone inhibits 11-beta-hydroxysteroid dehydrogenase, producing mineralocorticoid excess that adds to thiazide-induced potassium wasting and counteracts antihypertensive therapy.
What to do
Avoid the combination where possible; if used, monitor serum potassium and blood pressure regularly and correct hypokalemia promptly.
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
Frequently asked questions
Can I take Atenolol-chlorthalidone with Carbenoxolone?
MediHelp rates the interaction as major. Atenolol-chlorthalidone and Carbenoxolone 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. Carbenoxolone causes mineralocorticoid-like sodium and water retention and potassium loss, which can raise blood pressure and oppose the antihypertensive effect. Combined with chlorthalidone, the risk of hypokalemia is considerably increased.
How serious is the interaction between Atenolol-chlorthalidone and Carbenoxolone?
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 the combination where possible; if used, monitor serum potassium and blood pressure regularly and correct hypokalemia promptly.
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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