Drug interactions
Fosinopril-hydrochlorothiazide + Valsartan
Severity: Major
Fosinopril-hydrochlorothiazide and Valsartan: major interaction.
Last updated Sources: US FDA label
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 an ACE inhibitor with an angiotensin receptor blocker gives dual renin-angiotensin blockade. It increases the risk of hypotension, hyperkalemia and acute kidney injury without a meaningful outcome benefit in most patients.
What this interaction means in plain words
Fosinopril-hydrochlorothiazide and Valsartan 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.
Fosinopril-hydrochlorothiazide belongs to Cardiovascular; Valsartan belongs to Cardiovascular.
Why it happens
Additive inhibition of the renin-angiotensin-aldosterone system at two points, reducing aldosterone and efferent arteriolar tone.
What to do
Avoid the combination in most patients and use a single RAS blocker. If it is used, monitor potassium, creatinine and blood pressure closely.
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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References
Other interactions of Fosinopril-hydrochlorothiazide
- Aliskiren + Fosinopril-hydrochlorothiazide Contraindicated
- Dofetilide + Fosinopril-hydrochlorothiazide Contraindicated
- Fosinopril-hydrochlorothiazide + Protein a column Contraindicated
- Fosinopril-hydrochlorothiazide + Sacubitril / valsartan Contraindicated
- Aldesleukin + Fosinopril-hydrochlorothiazide Major
- Amifostine + Fosinopril-hydrochlorothiazide Major
Other interactions of Valsartan
- Aliskiren + Valsartan Contraindicated
- Sparsentan + Valsartan Contraindicated
- Aldesleukin + Valsartan Major
- Amifostine + Valsartan Major
- Amiloride + Valsartan Major
- Amlodipine-benazepril + Valsartan Major
Frequently asked questions
Can I take Fosinopril-hydrochlorothiazide with Valsartan?
MediHelp rates the interaction as major. Fosinopril-hydrochlorothiazide and Valsartan 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 an ACE inhibitor with an angiotensin receptor blocker gives dual renin-angiotensin blockade. It increases the risk of hypotension, hyperkalemia and acute kidney injury without a meaningful outcome benefit in most patients.
How serious is the interaction between Fosinopril-hydrochlorothiazide and Valsartan?
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 the combination in most patients and use a single RAS blocker. If it is used, monitor potassium, creatinine and blood pressure closely.
What other medicines interact with Fosinopril-hydrochlorothiazide?
MediHelp also lists interactions of Fosinopril-hydrochlorothiazide with, for example, Aliskiren, Dofetilide, Protein a column. The full list is on the Fosinopril-hydrochlorothiazide page.
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