Lithium and Naproxen: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Lithium interacts with Naproxen

NSAIDs reduce renal prostaglandin synthesis, decreasing renal blood flow and lithium clearance, raising serum lithium by 25-60%.

What you should do

Monitor lithium levels within 5-7 days of starting an NSAID; consider paracetamol as a safer alternative analgesic.

Key facts

Severity

Moderate — caution required

Mechanism

NSAIDs reduce renal prostaglandin synthesis, decreasing renal blood flow and lithium clearance, raising serum lithium by...

Action

Monitor lithium levels within 5-7 days of starting an NSAID; consider paracetamol as a safer alternative analgesic.

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 Naproxen together?

With caution. Monitor lithium levels within 5-7 days of starting an NSAID; consider paracetamol as a safer alternative analgesic.

What is the severity of this interaction?

The interaction between Lithium and Naproxen is classified as Moderate — caution required. NSAIDs reduce renal prostaglandin synthesis, decreasing renal blood flow and lithium clearance, raising serum lithium by 25-60%.

What should I do if I'm prescribed both?

Monitor lithium levels within 5-7 days of starting an NSAID; consider paracetamol as a safer alternative analgesic. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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