Drug interactions
Chlorothiazide + Sotalol
Severity: Major
Chlorothiazide and Sotalol: 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
Thiazide diuretics can cause hypokalemia and hypomagnesemia. These electrolyte disturbances increase the risk of QT prolongation and torsade de pointes with sotalol.
What this interaction means in plain words
Chlorothiazide 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.
Chlorothiazide belongs to Cardiovascular; Sotalol belongs to Cardiovascular.
Why it happens
Diuretic-induced hypokalemia and hypomagnesemia potentiate sotalol's QT-prolonging effect.
What to do
Check potassium and magnesium before and during therapy, replace deficits, and monitor the ECG for QTc prolongation.
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 Sotalol
- Arsenic trioxide + Sotalol Contraindicated
- Artemether / lumefantrine + Sotalol Contraindicated
- Disopyramide + Sotalol Contraindicated
- Dofetilide + Sotalol Contraindicated
- Dronedarone + Sotalol Contraindicated
- Droperidol + Sotalol Contraindicated
Other interactions of Chlorothiazide
Frequently asked questions
Can I take Chlorothiazide with Sotalol?
MediHelp rates the interaction as major. Chlorothiazide 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. Thiazide diuretics can cause hypokalemia and hypomagnesemia. These electrolyte disturbances increase the risk of QT prolongation and torsade de pointes with sotalol.
How serious is the interaction between Chlorothiazide 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 during therapy, replace deficits, and monitor the ECG for QTc prolongation.
What other medicines interact with Sotalol?
MediHelp also lists interactions of Sotalol with, for example, Arsenic trioxide, Artemether / lumefantrine, Disopyramide. The full list is on the Sotalol page.
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