Drug interactions
Hydrochlorothiazide-irbesartan + Losartan
Severity: Major
Hydrochlorothiazide-irbesartan and Losartan: 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 provides no added benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. Dual RAAS blockade is generally discouraged.
What this interaction means in plain words
Hydrochlorothiazide-irbesartan and Losartan 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.
Hydrochlorothiazide-irbesartan belongs to Cardiovascular; Losartan belongs to Cardiovascular.
Why it happens
Duplicate angiotensin II receptor blockade causing excessive RAAS inhibition.
What to do
Avoid using two ARBs together and keep only one agent. If dual blockade has occurred, monitor potassium and creatinine closely and stop one drug.
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 Hydrochlorothiazide-irbesartan
- Aliskiren + Hydrochlorothiazide-irbesartan Contraindicated
- Dofetilide + Hydrochlorothiazide-irbesartan Contraindicated
- Hydrochlorothiazide-irbesartan + Sparsentan Contraindicated
- Aldesleukin + Hydrochlorothiazide-irbesartan Major
- Amifostine + Hydrochlorothiazide-irbesartan Major
- Amiloride + Hydrochlorothiazide-irbesartan Major
Other interactions of Losartan
- Aliskiren + Losartan Contraindicated
- Losartan + Sparsentan Contraindicated
- Amifostine + Losartan Major
- Amiloride + Losartan Major
- Amlodipine-benazepril + Losartan Major
- Amlodipine-hydrochlorothiazide-valsartan + Losartan Major
Frequently asked questions
Can I take Hydrochlorothiazide-irbesartan with Losartan?
MediHelp rates the interaction as major. Hydrochlorothiazide-irbesartan and Losartan 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 provides no added benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. Dual RAAS blockade is generally discouraged.
How serious is the interaction between Hydrochlorothiazide-irbesartan and Losartan?
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 only one agent. If dual blockade has occurred, monitor potassium and creatinine closely and stop one drug.
What other medicines interact with Hydrochlorothiazide-irbesartan?
MediHelp also lists interactions of Hydrochlorothiazide-irbesartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-irbesartan page.
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