Buprenorphine and Quinethazone: 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
Quinethazone
No brand names on record
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.
Here's what's going on. Buprenorphine is a strong pain medicine (an opioid). Quinethazone is a water pill (diuretic) that helps your body get rid of extra fluid and can help lower blood pressure. When you take an opioid, it can make your body hold on to more water by releasing a hormone that tells your kidneys to keep fluid in. That may make your water pill work a little less well.
The good news: this is mostly a theoretical concern, not something proven to happen often. Your care team can watch how well the water pill is working and adjust things if needed. Please don't change either medicine on your own. Just let your doctor or pharmacist know you take both.
Interaction: Opioids such as buprenorphine may reduce the efficacy of thiazide-type diuretics like quinethazone.
- Mechanism: opioid-induced release of antidiuretic hormone (ADH), promoting water retention and counteracting diuresis. Neither agent's activation depends on the other's metabolism; this is a PD interaction, not PK.
- Direction: reduced diuretic/antihypertensive effect.
- Evidence: theoretical; onset unspecified; on-file severity major.
- Management: monitor urine output, edema, weight, and blood pressure. The diuretic dose may need to be individualized and titrated upward if diminished diuresis is observed.
What happens
Reduced efficacy of diuretics
Interaction Deep Dive
When opioids such as buprenorphine are given together with diuretics, the diuretic's effectiveness may be lessened 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 when required1.
Why it happens (mechanism)
Induction of antidiuretic hormone release
How to manage this interaction
How your care team may handle this:
- Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your team may watch for signs the water pill is working less well, such as swelling, weight gain, or higher blood pressure.
- If needed, the diuretic dose can be adjusted and individualized by your care team.
What to do: Tell your pharmacist and doctor you take both. Report new swelling in your legs or feet, sudden weight gain, or blood pressure readings that seem higher than usual. These are things your team can manage by monitoring you and tailoring your dose.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Quinethazone together?
Buprenorphine may slightly weaken how well quinethazone removes fluid and controls blood pressure, but this is theoretical and your care team can manage it by monitoring and adjusting the diuretic dose if needed. Keep taking both as prescribed and report any new swelling or higher blood pressure. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Quinethazone 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 Buprenorphine and Quinethazone interaction managed?
How your care team may handle this: Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your team may watch for signs the water pill is working less well, such as swelling, weight gain, or higher blood pressure. If needed, the diuretic dose can be adjusted and individualized by your care team. What to do: Tell your pharmacist and doctor you take both. Repor… 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 Buprenorphine or Quinethazone 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 Quinethazone
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