Lithium and Valsartan: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Lithium and Valsartan unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Lithium interacts with Valsartan

Angiotensin II receptor blockers reduce renal sodium and lithium excretion through afferent arteriolar effects, raising serum lithium by 20-40%.

What you should do

Check lithium level 5-7 days after initiating or up-titrating the ARB and adjust lithium dose; reinforce hydration during illness or hot weather.

Key facts

Severity

Major — avoid combination

Mechanism

Angiotensin II receptor blockers reduce renal sodium and lithium excretion through afferent arteriolar effects, raising ...

Action

Check lithium level 5-7 days after initiating or up-titrating the ARB and adjust lithium dose; reinforce hydration durin...

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 Valsartan together?

No — this combination should generally be avoided. Check lithium level 5-7 days after initiating or up-titrating the ARB and adjust lithium dose; reinforce hydration during illness or hot weather.

What is the severity of this interaction?

The interaction between Lithium and Valsartan is classified as Major — avoid combination. Angiotensin II receptor blockers reduce renal sodium and lithium excretion through afferent arteriolar effects, raising serum lithium by 20-40%.

What should I do if I'm prescribed both?

Check lithium level 5-7 days after initiating or up-titrating the ARB and adjust lithium dose; reinforce hydration during illness or hot weather. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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