Spironolactone 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
Spironolactone
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: Buprenorphine is a strong pain medicine (an opioid), and spironolactone (Aldactone) is a water pill that helps your body get rid of extra fluid. Opioids like buprenorphine can cause your body to hold onto more water, which may make your water pill work a little less well. You might notice less of the fluid loss you expect, or changes in your blood pressure.
The good news is this concern is theoretical, meaning it is based on how these drugs might behave rather than strong proof. Your care team can easily keep an eye on this and adjust your water pill dose if needed. Keep taking both as prescribed and let your pharmacist or doctor know if you notice swelling or blood pressure changes.
Effect: Opioids such as buprenorphine may reduce the efficacy of diuretics, including spironolactone, via induction of antidiuretic hormone (ADH) release, promoting water retention and attenuating diuresis.
- Direction: Reduced diuretic/antihypertensive effect (PD interaction, not CYP-mediated). Neither agent is affected by prodrug considerations here.
- Evidence: Theoretical; magnitude and onset unspecified.
- Severity on file: Major.
- Management: Monitor for diminished diuresis, weight/fluid status, edema, and blood pressure. The diuretic dose may need to be individualized and increased as clinically indicated.
What happens
Reduced efficacy of diuretics
Interaction Deep Dive
When opioids such as buprenorphine are given together with diuretics, the diuretic effect may be lessened because opioids can trigger the release of antidiuretic hormone. Watch patients for indications of reduced urine output 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 manageable with routine monitoring. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Your care team may watch for signs the water pill is working less well, such as new or worsening swelling, weight gain, or blood pressure changes.
- Your spironolactone dose may need to be adjusted and individualized by your care team if reduced fluid removal is seen.
- Tell your pharmacist or doctor if you notice ankle or leg swelling, sudden weight gain, or unusual blood pressure readings.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Spironolactone and Buprenorphine together?
Buprenorphine may slightly reduce how well spironolactone removes fluid, but this is theoretical and easily managed with monitoring; keep taking both as prescribed and report swelling or blood pressure changes to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Spironolactone 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 Spironolactone and Buprenorphine interaction managed?
How to manage this: This is manageable with routine monitoring. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your care team may watch for signs the water pill is working less well, such as new or worsening swelling, weight gain, or blood pressure changes. Your spironolactone dose may need to be adjusted and individualized by your care team if reduc… 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 Spironolactone 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 Spironolactone
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.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist