Drug interactions
Losartan + Potassium
Severity: Moderate
Losartan and Potassium: moderate 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
Losartan reduces aldosterone-mediated potassium excretion, so potassium supplements can cause hyperkalemia. The risk is higher with renal impairment, diabetes or older age.
What this interaction means in plain words
Losartan and Potassium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Angiotensin II receptor blockade reduces aldosterone, decreasing renal potassium excretion and adding to potassium intake.
What to do
Monitor serum potassium and renal function regularly, especially after starting or changing doses. Avoid unnecessary potassium supplements.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Losartan with Potassium?
MediHelp rates the interaction as moderate. Losartan and Potassium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Losartan reduces aldosterone-mediated potassium excretion, so potassium supplements can cause hyperkalemia. The risk is higher with renal impairment, diabetes or older age.
How serious is the interaction between Losartan and Potassium?
MediHelp rates it moderate, 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 regularly, especially after starting or changing doses. Avoid unnecessary potassium supplements.
What other medicines interact with Losartan?
MediHelp also lists interactions of Losartan with, for example, Aliskiren, Sparsentan, Amifostine. The full list is on the Losartan page.
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