Drug interactions
Chlorthalidone + Sotalol
Severity: Major
Chlorthalidone and Sotalol: major interaction.
Last updated Sources: US FDA label
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-induced hypokalemia and hypomagnesemia markedly increase the risk of QT prolongation and torsades de pointes with sotalol. Sotalol does not offset potassium loss, so this is a serious arrhythmia risk.
What this interaction means in plain words
Chlorthalidone and Sotalol 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.
Chlorthalidone belongs to Cardiovascular; Sotalol belongs to Cardiovascular.
Why it happens
Diuretic-induced hypokalemia and hypomagnesemia potentiate the QT-prolonging effect of sotalol.
What to do
Check potassium and magnesium before and regularly during therapy and keep them in the normal range. Monitor ECG and QTc, and consider an alternative if electrolyte disturbances persist.
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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References
Other interactions of Chlorthalidone
Other interactions of Sotalol
- Arsenic trioxide + Sotalol Contraindicated
- Artemether / lumefantrine + Sotalol Contraindicated
- Disopyramide + Sotalol Contraindicated
- Dofetilide + Sotalol Contraindicated
- Dronedarone + Sotalol Contraindicated
- Droperidol + Sotalol Contraindicated
Frequently asked questions
Can I take Chlorthalidone with Sotalol?
MediHelp rates the interaction as major. Chlorthalidone and Sotalol 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. Chlorthalidone-induced hypokalemia and hypomagnesemia markedly increase the risk of QT prolongation and torsades de pointes with sotalol. Sotalol does not offset potassium loss, so this is a serious arrhythmia risk.
How serious is the interaction between Chlorthalidone and Sotalol?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check potassium and magnesium before and regularly during therapy and keep them in the normal range. Monitor ECG and QTc, and consider an alternative if electrolyte disturbances persist.
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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