Drug interactions
Hydrochlorothiazide-olmesartan + Potassium phosphates
Severity: Major
Hydrochlorothiazide-olmesartan and Potassium phosphates: 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
Olmesartan reduces aldosterone-mediated potassium excretion, and intravenous potassium phosphates deliver a potassium load. Together they can produce clinically significant hyperkalemia, especially in renal impairment.
What this interaction means in plain words
Hydrochlorothiazide-olmesartan and Potassium phosphates 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.
Why it happens
Additive increase in serum potassium from reduced renal potassium excretion plus potassium supplementation.
What to do
Monitor serum potassium and renal function closely and give the lowest effective potassium dose. Use an alternative phosphate source such as sodium phosphate if appropriate.
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
Frequently asked questions
Can I take Hydrochlorothiazide-olmesartan with Potassium phosphates?
MediHelp rates the interaction as major. Hydrochlorothiazide-olmesartan and Potassium phosphates 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. Olmesartan reduces aldosterone-mediated potassium excretion, and intravenous potassium phosphates deliver a potassium load. Together they can produce clinically significant hyperkalemia, especially in renal impairment.
How serious is the interaction between Hydrochlorothiazide-olmesartan and Potassium phosphates?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium and renal function closely and give the lowest effective potassium dose. Use an alternative phosphate source such as sodium phosphate if appropriate.
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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