Drug interactions
Chlorthalidone + Telmisartan
Severity: Minor
Chlorthalidone and Telmisartan: 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
Telmisartan reduces aldosterone-mediated potassium excretion and tends to offset chlorthalidone-induced hypokalemia, while blood pressure lowering is additive. The combination is common and well tolerated, though hypotension or renal function changes can occur in volume-depleted patients.
What this interaction means in plain words
Chlorthalidone and Telmisartan 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; Telmisartan belongs to Cardiovascular.
Why it happens
Angiotensin receptor blockade counterbalances thiazide-type kaliuresis; antihypertensive effects are additive.
What to do
Monitor potassium and creatinine after initiation or dose changes 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 Telmisartan
- Aliskiren + Telmisartan Contraindicated
- Sparsentan + Telmisartan Contraindicated
- Amifostine + Telmisartan Major
- Amiloride + Telmisartan Major
- Amlodipine-benazepril + Telmisartan Major
- Amlodipine-hydrochlorothiazide-valsartan + Telmisartan Major
Frequently asked questions
Can I take Chlorthalidone with Telmisartan?
MediHelp rates the interaction as minor. Chlorthalidone and Telmisartan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Telmisartan reduces aldosterone-mediated potassium excretion and tends to offset chlorthalidone-induced hypokalemia, while blood pressure lowering is additive. The combination is common and well tolerated, though hypotension or renal function changes can occur in volume-depleted patients.
How serious is the interaction between Chlorthalidone and Telmisartan?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor potassium and creatinine after initiation or dose changes 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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