Drug interactions
Fosinopril-hydrochlorothiazide + Potassium phosphates
Severity: Major
Fosinopril-hydrochlorothiazide and Potassium phosphates: 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
Potassium phosphate supplements add a potassium load, and ACE inhibitors reduce renal potassium excretion, so hyperkalemia can develop. The thiazide partially offsets this, but risk remains high in renal impairment or with intravenous administration.
What this interaction means in plain words
Fosinopril-hydrochlorothiazide 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
ACE inhibition lowers aldosterone-mediated potassium excretion while the supplement increases potassium intake.
What to do
Monitor serum potassium and renal function closely and use cautious dosing and infusion rates; ECG monitoring is advisable with IV potassium.
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
Frequently asked questions
Can I take Fosinopril-hydrochlorothiazide with Potassium phosphates?
MediHelp rates the interaction as major. Fosinopril-hydrochlorothiazide 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. Potassium phosphate supplements add a potassium load, and ACE inhibitors reduce renal potassium excretion, so hyperkalemia can develop. The thiazide partially offsets this, but risk remains high in renal impairment or with intravenous administration.
How serious is the interaction between Fosinopril-hydrochlorothiazide 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 use cautious dosing and infusion rates; ECG monitoring is advisable with IV potassium.
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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