Scopolamine 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
Scopolamine
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 your body down in similar ways. Buprenorphine is an opioid that can make you sleepy or dizzy, and scopolamine can add to that drowsiness and foggy feeling. When you take them together, those effects can stack up.
There is another thing to watch for. Both drugs can slow your gut and bladder, so together they may cause bad constipation or trouble urinating. In rare cases the gut can nearly stop moving. This is a theoretical concern based on how the drugs work, so please don't stop either one on your own. Your care team can manage this safely by watching how you feel and adjusting as needed.
Effect: Additive CNS depression and additive anticholinergic/opioid effects on GI and urinary motility. Combining buprenorphine (opioid partial agonist) with scopolamine (anticholinergic) may potentiate sedation, dizziness, and disorientation, and increase risk of urinary retention, severe constipation, and paralytic ileus.
Mechanism: Pharmacodynamic (additive), not PK. Neither agent's metabolism drives this.
Evidence: Theoretical. Severity: Major. Onset: Unspecified.
- Prefer one agent over the other based on clinical need.
- If combined, monitor for excess sedation, mental status changes, urinary retention, and reduced bowel motility.
- Consider a proactive bowel regimen and dose individualization by the care team.
What happens
Increased or potentiated scopolamine effects, an increased risk of CNS depression and an increased risk of paralytic ileus
Interaction Deep Dive
When scopolamine is taken together with other agents known to produce CNS adverse effects such as drowsiness, dizziness, or disorientation (for example sedatives, hypnotics, opiates, and anxiolytics), including buprenorphine, the effects of scopolamine may be intensified. Based on which medication matters more for the patient, select either scopolamine or buprenorphine. Should the two need to be given together, watch patients for CNS adverse reactions2. In addition, giving buprenorphine alongside scopolamine, an anticholinergic agent, can lead to urinary retention or severe constipation that progresses to paralytic ileus. When buprenorphine is combined with anticholinergic drugs, observe patients for indications of urinary retention or diminished gastric motility1.
Why it happens (mechanism)
Additive CNS depression; additive effects on gastric motility
How to manage this interaction
Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your care team may decide that only one of these is truly needed, or they may keep both and watch you more closely.
- Watch for extra drowsiness, dizziness, or confusion, especially early on.
- Report constipation or trouble urinating. Severe, worsening constipation or belly bloating and pain needs prompt attention.
- Your team may suggest steps to keep your bowels moving and may adjust and individualize your doses.
Ask your pharmacist or prescriber before making any changes, and check in if new symptoms appear.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Scopolamine and Buprenorphine together?
Taken together, buprenorphine and scopolamine can add up to more drowsiness and a higher risk of severe constipation or urinary retention, so watch for these and tell your care team, who can manage it by monitoring and tailoring your doses. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Scopolamine 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 Scopolamine and Buprenorphine interaction managed?
Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your care team may decide that only one of these is truly needed, or they may keep both and watch you more closely. Watch for extra drowsiness, dizziness, or confusion, especially early on. Report constipation or trouble urinating. Severe, worsening constipation or belly bloating and pain needs prompt atte… 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 Scopolamine 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 (2)
- Product Information: BRIXADI(TM) subcutaneous extended-release injection, buprenorphine subcutaneous extended-release injection. Braeburn Inc (per FDA), Plymouth Meeting, PA, 2023. DailyMed
- Product Information: TRANSDERM SCOP transdermal system patch, scopolamine transdermal system patch. Baxter Healthcare Corporation (per FDA), Deerfield, IL, 2025. DailyMed
Keep reading about Buprenorphine
Keep reading about Scopolamine
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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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