Bendroflumethiazide 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
Bendroflumethiazide
No brand names on recordBuprenorphine
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's going on: Bendroflumethiazide is a water pill (diuretic) that helps your body get rid of extra fluid and lower blood pressure. Buprenorphine is an opioid pain and dependence medicine. When taken together, the opioid may cause your body to hold onto more water by releasing a hormone that reduces urine output. That can make your water pill work a little less well.
Please don't change anything on your own. This is based mostly on theory rather than strong studies, and it's very manageable. Your care team can simply keep an eye on your blood pressure, swelling, and how much you're urinating, and adjust your diuretic dose if needed. Bring it up at your next visit.
Effect: Reduced diuretic efficacy of bendroflumethiazide (a thiazide) when combined with buprenorphine.
Mechanism: Opioids may stimulate antidiuretic hormone (ADH/vasopressin) release, promoting water retention and opposing the natriuretic/diuretic action. This is a PD interaction; neither agent is a prodrug relevant here.
- Direction: Diminished diuresis and possible blunting of BP control.
- Onset: Unspecified.
- Evidence: Theoretical; magnitude not quantified.
- Management: Monitor urine output, edema, weight, and blood pressure. Titrate diuretic dose as clinically indicated.
What happens
Reduced efficacy of diuretics
Interaction Deep Dive
Giving opioids such as buprenorphine together with diuretics can lessen how well the diuretics work, because these opioids 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 when necessary1.
Why it happens (mechanism)
Induction of antidiuretic hormone release
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This interaction can be handled with monitoring.
- Your care team may watch your blood pressure, weight, swelling (ankles/legs), and urine output more closely.
- If the water pill seems less effective, your diuretic dose may need to be adjusted and individualized by your team.
- Tell your pharmacist or prescriber if you notice more swelling, sudden weight gain, or your blood pressure creeping up.
Because the evidence here is mainly theoretical, this is often a matter of routine follow-up rather than a reason to worry.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Bendroflumethiazide and Buprenorphine together?
Buprenorphine may slightly weaken how well bendroflumethiazide removes fluid, so your team may monitor your blood pressure, weight, and swelling and adjust the water pill dose if needed. Keep taking both as prescribed and report any new swelling or rising blood pressure. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Bendroflumethiazide 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 Bendroflumethiazide and Buprenorphine interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This interaction can be handled with monitoring. Your care team may watch your blood pressure, weight, swelling (ankles/legs), and urine output more closely. If the water pill seems less effective, your diuretic dose may need to be adjusted and individualized by your team. Tell your pharmacist or prescriber if you… 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.
Questions for your pharmacist
- Does my dose of Bendroflumethiazide 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 Bendroflumethiazide
Keep reading about Buprenorphine
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