Buprenorphine and Chlorothiazide: 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
Chlorothiazide
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.
You've been prescribed buprenorphine (a pain or opioid-dependence medicine) along with chlorothiazide (a water pill, or diuretic). Here's the idea: opioids like buprenorphine can nudge your body to hold onto more water by releasing a hormone that tells your kidneys to keep fluid. That may make your water pill work a little less well, so you might not lose as much fluid or your blood pressure control might slip a bit.
The good news is this is a theoretical concern, not something proven to happen in everyone. Your care team can easily keep an eye on your blood pressure and swelling and adjust your diuretic dose if needed. Please keep taking both exactly as prescribed and bring up any questions with your pharmacist or doctor.
Effect: Potential reduced diuretic efficacy when buprenorphine is coadministered with chlorothiazide.
Mechanism: Opioids may stimulate antidiuretic hormone (ADH/vasopressin) release, promoting renal water retention and counteracting the natriuretic/diuretic effect of the thiazide. This is a pharmacodynamic interaction; neither agent alters the other's metabolism.
Direction: Diminished diuretic response (reduces drug effect).
- Onset: Unspecified
- Evidence: Theoretical
- Management: Monitor diuresis, edema, blood pressure, and body weight. The diuretic dose may need to be adjusted and individualized by the care team if diminished response is observed.
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 lessened because the opioid triggers 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
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This is a theoretical concern, and it is manageable.
- Your care team may monitor you more closely, watching your blood pressure, any swelling in your legs or ankles, and your weight.
- If your water pill seems to be working less well, your diuretic dose may be adjusted and individualized by your care team.
- Tell your pharmacist or doctor if you notice new or worse swelling, sudden weight gain, or higher blood pressure readings.
A quick check-in with your pharmacist can confirm this fits your situation.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Chlorothiazide together?
Buprenorphine may slightly reduce how well chlorothiazide works by prompting water retention, but this is theoretical. Keep taking both as prescribed and let your care team monitor your blood pressure, swelling, and weight so they can adjust the diuretic if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Chlorothiazide 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 Chlorothiazide interaction managed?
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This is a theoretical concern, and it is manageable. Your care team may monitor you more closely, watching your blood pressure, any swelling in your legs or ankles, and your weight. If your water pill seems to be working less well, your diuretic dose may be adjusted and individualized by your care team. Tell 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 Buprenorphine or Chlorothiazide 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 Chlorothiazide
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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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