Losartan and Spironolactone: Drug Interaction Guide

Quick answer: This combination requires caution. Losartan and Spironolactone can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Losartan interacts with Spironolactone

Combined RAAS blockade and potassium-sparing diuretic effect reduce renal potassium excretion, leading to clinically significant hyperkalaemia.

What you should do

Check potassium and creatinine at baseline, 1 week, and 1 month; avoid combination in eGFR <30 mL/min/1.73m².

Key facts

Severity

Moderate — caution required

Mechanism

Combined RAAS blockade and potassium-sparing diuretic effect reduce renal potassium excretion, leading to clinically sig...

Action

Check potassium and creatinine at baseline, 1 week, and 1 month; avoid combination in eGFR <30 mL/min/1.73m².

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Losartan and Spironolactone together?

With caution. Check potassium and creatinine at baseline, 1 week, and 1 month; avoid combination in eGFR <30 mL/min/1.73m².

What is the severity of this interaction?

The interaction between Losartan and Spironolactone is classified as Moderate — caution required. Combined RAAS blockade and potassium-sparing diuretic effect reduce renal potassium excretion, leading to clinically significant hyperkalaemia.

What should I do if I'm prescribed both?

Check potassium and creatinine at baseline, 1 week, and 1 month; avoid combination in eGFR <30 mL/min/1.73m². Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.