Drug interactions
Chlorthalidone + Olmesartan
Severity: Minor
Chlorthalidone and Olmesartan: 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
Olmesartan lessens aldosterone-driven potassium loss and so tends to offset chlorthalidone-induced hypokalemia, while their antihypertensive effects add together. The combination is widely used, but volume-depleted patients may develop hypotension or renal function changes.
What this interaction means in plain words
Chlorthalidone and Olmesartan 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; Olmesartan belongs to Cardiovascular.
Why it happens
Angiotensin receptor blockade reduces aldosterone-mediated kaliuresis, counterbalancing thiazide-type potassium wasting.
What to do
Check potassium and creatinine after starting or changing doses and periodically afterwards. Correct volume depletion before initiating.
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 Olmesartan
- Aliskiren + Olmesartan Contraindicated
- Olmesartan + Sparsentan Contraindicated
- Aldesleukin + Olmesartan Major
- Amifostine + Olmesartan Major
- Amiloride + Olmesartan Major
- Amlodipine-benazepril + Olmesartan Major
Frequently asked questions
Can I take Chlorthalidone with Olmesartan?
MediHelp rates the interaction as minor. Chlorthalidone and Olmesartan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Olmesartan lessens aldosterone-driven potassium loss and so tends to offset chlorthalidone-induced hypokalemia, while their antihypertensive effects add together. The combination is widely used, but volume-depleted patients may develop hypotension or renal function changes.
How serious is the interaction between Chlorthalidone and Olmesartan?
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 changing doses and periodically afterwards. Correct volume depletion before initiating.
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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