Bumetanide and Lithium Carbonate: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Bumetanide
Lithium Carbonate
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
An increased risk of lithium toxicity
Interaction Deep Dive
Loop diuretics may affect renal function and increase serum lithium concentrations1. Concomitant furosemide and lithium therapy has resulted in sodium loss, reduced excretion of lithium, and symptoms of lithium toxicity. This is especially important in patients who are also sodium restricted, which may lead to a further decline in lithium excretion 34567. If concomitant use is unavoidable, reduce the initial lithium dosage and titrate slowly to clinical response. Monitor serum lithium levels frequently and observe for signs and symptoms of lithium toxicity 1.
Why it happens (mechanism)
Unknown
Literature reports
3 reports — tap to read
a) Furosemide had no effect on plasma lithium levels during concomitant administration in a 12-week study. The dose of furosemide ranged from 20 mg to 80 mg daily with potassium supplementation. These data indicate the safety of furosemide administration with lithium, unlike thiazides which can precipitate lithium toxicity due to sodium depletion. However, close monitoring of lithium levels is also advised during concomitant furosemide therapy 2.
b) A 76-year-old woman developed reversible chorea a few weeks after starting furosemide 40 mg once daily and potassium 20 mEq once daily for hypertension. Her chorea was attributed to lithium toxicity. The patient was previously taking lithium 300 mg twice daily and no other regular medications. Upon admission to the emergency room, the patient was lethargic, confused, and dysarthric. Serum laboratory studies revealed a lithium level of 2.2 mEq/L (therapeutic range, 0.6 to 1.2 mEq/L). Approximately 18 hours after admission, the patient became more alert but developed involuntary choreiform movements in her head, neck, trunk, and extremities. Lithium levels declined slowly over the next week, with associated improvement in speech and the chorea 3.
c) A 65-year-old patient who was previously stabilized on lithium developed trembling, ataxia, and confusion following the addition of bumetanide 0.5 mg daily for one month. Serum lithium was 2.3 mEq/L on admission. The patient was also on a sodium-restricted diet which may have contributed to lithium toxicity. Lithium was discontinued for seven days and reinstated at a lower dosage, even though the patient remained slightly hypomanic 4.
Common questions
Can I take Bumetanide and Lithium Carbonate together?
An increased risk of lithium toxicity Always confirm with your pharmacist or prescriber before making any change.
How serious is the Bumetanide and Lithium Carbonate interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Bumetanide or Lithium Carbonate need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (7)
- Product Information: LITHOBID(R) oral extended release tablets, lithium carbonate oral extended release tablets. ANI Pharmaceuticals, Inc. (per FDA), Baudette, MN, 2016. DailyMed
- Saffer D & Coppen A: Frusemide: a safe diuretic during lithium therapy?. J Affect Disord 1983; 5:289-292. PubMed
- Podskalny GD & Factor SA: Chorea caused by lithium intoxication: a case report and literature review. Movement Disorders 1996; 11:733-737. DOI
- Huang LG: Lithium intoxication with coadministration of a loop-diuretic (letter). J Clin Psychopharmacol 1990; 10:228. PubMed
- Kerry RJ, Ludlow JM, & Owen G: Diuretics are dangerous with lithium. Br Med J 1980; 281:371. DOI
- Hurtig HI & Dyson WL: Lithium toxicity enhanced by diuresis (letter). N Engl J Med 1974; 290:748-749. DOI
- Oh TE: Frusemide and lithium toxicity. Anaesth Intensive Care 1977; 5:60-62. DOI
Keep reading about Bumetanide
Keep reading about Lithium Carbonate
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