Drug interactions
Candesartan-hydrochlorothiazide + Irbesartan
Severity: Major
Candesartan-hydrochlorothiazide and Irbesartan: 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
Combining two angiotensin receptor blockers gives no added antihypertensive benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. The hydrochlorothiazide component offsets potassium retention only partly.
What this interaction means in plain words
Candesartan-hydrochlorothiazide and Irbesartan 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.
Candesartan-hydrochlorothiazide belongs to Cardiovascular; Irbesartan belongs to Cardiovascular.
Why it happens
Duplicate blockade of the AT1 receptor causes additive reductions in aldosterone-mediated potassium excretion and in glomerular efferent tone.
What to do
Avoid using two ARBs together and keep a single agent. If the combination is unavoidable, monitor potassium, creatinine, and blood pressure.
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 Candesartan-hydrochlorothiazide
- Aliskiren + Candesartan-hydrochlorothiazide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Sparsentan Contraindicated
- Acemetacin + Candesartan-hydrochlorothiazide Major
- Amifostine + Candesartan-hydrochlorothiazide Major
- Amiloride + Candesartan-hydrochlorothiazide Major
Other interactions of Irbesartan
- Aliskiren + Irbesartan Contraindicated
- Irbesartan + Sparsentan Contraindicated
- Amifostine + Irbesartan Major
- Amiloride + Irbesartan Major
- Amlodipine-benazepril + Irbesartan Major
- Amlodipine-hydrochlorothiazide-valsartan + Irbesartan Major
Frequently asked questions
Can I take Candesartan-hydrochlorothiazide with Irbesartan?
MediHelp rates the interaction as major. Candesartan-hydrochlorothiazide and Irbesartan 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. Combining two angiotensin receptor blockers gives no added antihypertensive benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. The hydrochlorothiazide component offsets potassium retention only partly.
How serious is the interaction between Candesartan-hydrochlorothiazide and Irbesartan?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using two ARBs together and keep a single agent. If the combination is unavoidable, monitor potassium, creatinine, and blood pressure.
What other medicines interact with Candesartan-hydrochlorothiazide?
MediHelp also lists interactions of Candesartan-hydrochlorothiazide with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Candesartan-hydrochlorothiazide page.
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