Furosemide and Buprenorphine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Buprenorphine
Furosemide
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 this means for you: Furosemide (Lasix) is a water pill that helps your body get rid of extra fluid. Buprenorphine, an opioid pain or dependence medicine, may make your body hold onto more water by triggering a hormone that tells your kidneys to keep fluid in. Because of this, your water pill might not work quite as well while you take both.
You might notice less swelling relief, or your blood pressure could shift. The good news is this is easy for your care team to handle. Keep taking both medicines as prescribed, and let your pharmacist or doctor know if you feel more puffy, gain water weight, or feel lightheaded.
Effect: Opioids including buprenorphine may reduce the diuretic efficacy of furosemide.
Mechanism: Opioid-induced release of antidiuretic hormone (ADH/vasopressin) promotes water retention, opposing furosemide's natriuretic/diuretic action. This is a pharmacodynamic interaction; neither drug is a prodrug and no CYP pathway is implicated.
Evidence: Theoretical; onset unspecified; magnitude not quantified.
Management:
- Monitor for diminished diuresis (edema, fluid weight, urine output) and blood pressure changes.
- The furosemide dose may need to be adjusted and individualized based on response.
- Continue both agents as prescribed unless directed otherwise.
What happens
Reduced efficacy of diuretics
Interaction Deep Dive
When opioids such as buprenorphine are given together with diuretics, the effectiveness of the diuretics may be lowered because opioids can trigger the release of antidiuretic hormone. Watch patients for indications of reduced diuresis and/or changes in blood pressure, and raise the diuretic dose as required1.
Why it happens (mechanism)
Induction of antidiuretic hormone release
How to manage this interaction
How to manage this: This is a theoretical interaction, so it may not affect everyone, but it is worth watching for.
- Keep taking both buprenorphine and furosemide exactly as prescribed.
- Your care team may monitor you more closely for signs your water pill is working less well, such as new or worsening swelling, water weight gain, less urination, or blood pressure changes.
- If needed, your furosemide dose may be adjusted and individualized by your care team.
Tell your pharmacist or doctor if you notice increased swelling, sudden weight gain, or feel unusually lightheaded.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Furosemide and Buprenorphine together?
Buprenorphine may make furosemide (Lasix) a bit less effective at removing fluid by causing your body to retain water. Keep taking both as prescribed and report new swelling, weight gain, or blood pressure changes so your team can adjust your dose if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Furosemide and Buprenorphine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Furosemide and Buprenorphine interaction managed?
How to manage this: This is a theoretical interaction, so it may not affect everyone, but it is worth watching for. Keep taking both buprenorphine and furosemide exactly as prescribed. Your care team may monitor you more closely for signs your water pill is working less well, such as new or worsening swelling, water weight gain, less urination, or blood pressure changes. If needed, your furosemide… Management is individual — always follow your own care team's guidance.
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 Furosemide or Buprenorphine 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 (1)
- Product Information: BRIXADI(TM) subcutaneous extended-release injection, buprenorphine subcutaneous extended-release injection. Braeburn Inc (per FDA), Plymouth Meeting, PA, 2023. DailyMed
Keep reading about Buprenorphine
Keep reading about Furosemide
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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