Furosemide and Lithium: Drug Interaction Guide
Quick answer: This combination requires caution. Furosemide and Lithium can be used together with adjustments and monitoring.
How Furosemide interacts with Lithium
Loop diuretics reduce sodium reabsorption, leading to compensatory increased proximal tubular reabsorption of lithium, raising serum lithium levels and toxicity risk.
What you should do
Monitor lithium levels within 1 week of initiating or changing furosemide dose; consider lithium dose reduction of 25-50% and watch for tremor, confusion, and ataxia.
Key facts
Severity
Moderate — caution required
Mechanism
Loop diuretics reduce sodium reabsorption, leading to compensatory increased proximal tubular reabsorption of lithium, r...
Action
Monitor lithium levels within 1 week of initiating or changing furosemide dose; consider lithium dose reduction of 25-50...
Frequently asked questions
Can I take Furosemide and Lithium together?
With caution. Monitor lithium levels within 1 week of initiating or changing furosemide dose; consider lithium dose reduction of 25-50% and watch for tremor, confusion, and ataxia.
What is the severity of this interaction?
The interaction between Furosemide and Lithium is classified as Moderate — caution required. Loop diuretics reduce sodium reabsorption, leading to compensatory increased proximal tubular reabsorption of lithium, raising serum lithium levels and toxicity risk.
What should I do if I'm prescribed both?
Monitor lithium levels within 1 week of initiating or changing furosemide dose; consider lithium dose reduction of 25-50% and watch for tremor, confusion, and ataxia. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.