Buprenorphine and Stramonium: 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
Stramonium
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.
Both of these medicines can slow down your gut and bladder. Buprenorphine is a strong pain medicine (an opioid), and one of its most common side effects is constipation. Stramonium is a plant-based product with anticholinergic effects, which also slow the movement of your intestines and can make it harder to empty your bladder.
When you take them together, those effects can add up. In rare cases this could lead to severe constipation where the bowel stops moving (called paralytic ileus) or trouble passing urine. This is a theoretical concern, not something proven to happen often, but it is worth watching. The good news is your care team can manage this by keeping an eye on you.
Additive reduction in GI and urinary motility. Buprenorphine (mu-opioid partial agonist) and stramonium (belladonna alkaloids with anticholinergic activity) both decrease gut motility. Combined use may produce additive effects leading to severe constipation, paralytic ileus, or urinary retention.
- Direction: additive pharmacodynamic effect (both reduce motility); neither is a relevant prodrug here.
- Evidence: theoretical.
- Onset: unspecified.
- Management: monitor for reduced gastric motility, abdominal distension, and urinary retention; ensure bowel regimen; adjust or reconsider therapy if symptoms develop.
What happens
An increased risk of paralytic ileus
Interaction Deep Dive
When buprenorphine is given together with an anticholinergic drug, the combination may lead to urinary retention or severe constipation that can progress to paralytic ileus. In patients receiving buprenorphine along with anticholinergic agents, watch for indications of urinary retention or decreased gastric motility1.
Why it happens (mechanism)
Additive effects on gastric motility
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This is mainly a caution to watch for symptoms.
- Watch for severe or worsening constipation, belly pain or bloating, no bowel movements, or trouble passing urine.
- Your care team may monitor you more closely and may suggest steps to keep your bowels moving.
- Your doses may need to be adjusted and individualized by your care team if symptoms appear.
- Call your pharmacist or doctor promptly if you notice these symptoms, and seek urgent care if your belly becomes very painful or swollen.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Stramonium together?
Taking buprenorphine with stramonium can add up to cause severe constipation or trouble urinating. Keep taking both as prescribed, stay alert for these symptoms, and contact your pharmacist or doctor if they occur. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Stramonium 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 Stramonium interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This is mainly a caution to watch for symptoms. Watch for severe or worsening constipation, belly pain or bloating, no bowel movements, or trouble passing urine. Your care team may monitor you more closely and may suggest steps to keep your bowels moving. Your doses may need to be adjusted and individualized by yo… 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 Stramonium 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 Stramonium
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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