Lithium and Losartan: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Lithium interacts with Losartan

Angiotensin II receptor blockers reduce renal perfusion and aldosterone-mediated sodium handling, decreasing renal lithium clearance and raising serum lithium levels.

What you should do

Monitor serum lithium 5-7 days after starting losartan and after dose changes; reduce lithium dose if levels rise toward toxicity.

Key facts

Severity

Moderate — caution required

Mechanism

Angiotensin II receptor blockers reduce renal perfusion and aldosterone-mediated sodium handling, decreasing renal lithi...

Action

Monitor serum lithium 5-7 days after starting losartan and after dose changes; reduce lithium dose if levels rise toward...

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 Lithium and Losartan together?

With caution. Monitor serum lithium 5-7 days after starting losartan and after dose changes; reduce lithium dose if levels rise toward toxicity.

What is the severity of this interaction?

The interaction between Lithium and Losartan is classified as Moderate — caution required. Angiotensin II receptor blockers reduce renal perfusion and aldosterone-mediated sodium handling, decreasing renal lithium clearance and raising serum lithium levels.

What should I do if I'm prescribed both?

Monitor serum lithium 5-7 days after starting losartan and after dose changes; reduce lithium dose if levels rise toward toxicity. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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