Drug interactions
Hydrochlorothiazide-olmesartan + Telmisartan
Severity: Major
Hydrochlorothiazide-olmesartan and Telmisartan: 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
Adding telmisartan to a regimen already containing olmesartan duplicates angiotensin receptor blockade. Dual RAS blockade increases the risk of hypotension, hyperkalemia and renal impairment without added outcome benefit.
What this interaction means in plain words
Hydrochlorothiazide-olmesartan and Telmisartan 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-olmesartan belongs to Cardiovascular; Telmisartan belongs to Cardiovascular.
Why it happens
Duplicate angiotensin II receptor blockade causing additive hemodynamic and potassium-retaining effects.
What to do
Avoid using two ARBs together and select a single agent. If combined exposure has occurred, 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 Hydrochlorothiazide-olmesartan
- Aliskiren + Hydrochlorothiazide-olmesartan Contraindicated
- Dofetilide + Hydrochlorothiazide-olmesartan Contraindicated
- Hydrochlorothiazide-olmesartan + Sparsentan Contraindicated
- Acemetacin + Hydrochlorothiazide-olmesartan Major
- Amifostine + Hydrochlorothiazide-olmesartan Major
- Amiloride + Hydrochlorothiazide-olmesartan Major
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 Hydrochlorothiazide-olmesartan with Telmisartan?
MediHelp rates the interaction as major. Hydrochlorothiazide-olmesartan and Telmisartan 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. Adding telmisartan to a regimen already containing olmesartan duplicates angiotensin receptor blockade. Dual RAS blockade increases the risk of hypotension, hyperkalemia and renal impairment without added outcome benefit.
How serious is the interaction between Hydrochlorothiazide-olmesartan and Telmisartan?
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 select a single agent. If combined exposure has occurred, monitor potassium, creatinine and blood pressure.
What other medicines interact with Hydrochlorothiazide-olmesartan?
MediHelp also lists interactions of Hydrochlorothiazide-olmesartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-olmesartan page.
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