Drug interactions
Chlorthalidone + Valsartan
Severity: Minor
Chlorthalidone and Valsartan: minor 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
Valsartan reduces aldosterone-mediated potassium loss and tends to offset chlorthalidone-induced hypokalemia, while blood pressure lowering is additive. The combination is widely used and well tolerated, though hypotension or renal function changes may occur in volume-depleted patients.
What this interaction means in plain words
Chlorthalidone and Valsartan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Chlorthalidone belongs to Cardiovascular; Valsartan belongs to Cardiovascular.
Why it happens
Angiotensin receptor blockade counterbalances thiazide-type kaliuresis; antihypertensive effects add together.
What to do
Check potassium and creatinine after starting or adjusting doses and periodically thereafter.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Chlorthalidone
Other interactions of Valsartan
- Aliskiren + Valsartan Contraindicated
- Sparsentan + Valsartan Contraindicated
- Aldesleukin + Valsartan Major
- Amifostine + Valsartan Major
- Amiloride + Valsartan Major
- Amlodipine-benazepril + Valsartan Major
Frequently asked questions
Can I take Chlorthalidone with Valsartan?
MediHelp rates the interaction as minor. Chlorthalidone and Valsartan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Valsartan reduces aldosterone-mediated potassium loss and tends to offset chlorthalidone-induced hypokalemia, while blood pressure lowering is additive. The combination is widely used and well tolerated, though hypotension or renal function changes may occur in volume-depleted patients.
How serious is the interaction between Chlorthalidone and Valsartan?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check potassium and creatinine after starting or adjusting doses and periodically thereafter.
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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