Drug interactions
Atenolol-chlorthalidone + Squill
Severity: Major
Atenolol-chlorthalidone and Squill: 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
Squill has digitalis-like cardiac glycoside activity, and potassium loss from chlorthalidone can increase its arrhythmogenic toxicity. Beta-blockade may add bradycardia and AV block.
What this interaction means in plain words
Atenolol-chlorthalidone and Squill 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
Diuretic-induced hypokalemia and hypomagnesemia sensitize the myocardium to glycoside toxicity, with additive AV nodal slowing from atenolol.
What to do
Avoid the combination where possible. If used, monitor potassium, magnesium and ECG regularly and correct deficits.
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 Squill?
MediHelp rates the interaction as major. Atenolol-chlorthalidone and Squill 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. Squill has digitalis-like cardiac glycoside activity, and potassium loss from chlorthalidone can increase its arrhythmogenic toxicity. Beta-blockade may add bradycardia and AV block.
How serious is the interaction between Atenolol-chlorthalidone and Squill?
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 potassium, magnesium and ECG regularly and correct deficits.
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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