Clidinium 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
Clidinium
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. Buprenorphine is an opioid, and opioids are well known for causing constipation. Clidinium is an anticholinergic, which also slows how your stomach and intestines move and can make it harder to empty your bladder.
Taken together, they can add up and, in rare cases, slow the gut so much that it nearly stops. This is called paralytic ileus. This concern is based on how the drugs work rather than lots of reported cases, so try not to worry. Watch for constipation, belly bloating or pain, and trouble urinating, and let your care team know. They can manage this well.
Effect: Additive reduction in GI motility, with theoretical increased risk of severe constipation, urinary retention, and paralytic ileus.
Mechanism: Pharmacodynamic. Buprenorphine (opioid mu-agonist) reduces gut motility; clidinium (anticholinergic) further inhibits smooth muscle motility and bladder emptying. Neither is a prodrug here; this is a PD, not PK, interaction.
Evidence/onset: Theoretical basis; onset unspecified. Severity major.
- Monitor for constipation, abdominal distension, reduced bowel sounds, and urinary retention.
- Consider prophylactic bowel regimen; individualize dosing and consider alternatives if motility compromised.
What happens
An increased risk of paralytic ileus
Interaction Deep Dive
Using buprenorphine together with an anticholinergic agent can lead to urinary retention or severe constipation that progresses to paralytic ileus. When buprenorphine is given alongside anticholinergic drugs, watch patients for indications of urinary retention or decreased gastric motility1.
Why it happens (mechanism)
Additive effects on gastric motility
How to manage this interaction
The good news is this is manageable with awareness and monitoring. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Watch for constipation, a swollen or painful belly, nausea, or trouble passing urine.
- Report these promptly to your pharmacist or prescriber.
- Ask whether a stool softener, fiber, or extra fluids would help prevent constipation.
- Your care team may monitor you more closely or adjust and individualize your doses to keep you comfortable.
Seek prompt care if you cannot have a bowel movement, cannot pass urine, or have severe belly pain.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Clidinium and Buprenorphine together?
Buprenorphine and clidinium both slow the gut and bladder, so together they can raise the risk of severe constipation, urinary retention, or (rarely) a stalled bowel. Keep taking both as prescribed, watch for these symptoms, and tell your care team right away. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Clidinium 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 Clidinium and Buprenorphine interaction managed?
The good news is this is manageable with awareness and monitoring. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Watch for constipation, a swollen or painful belly, nausea, or trouble passing urine. Report these promptly to your pharmacist or prescriber. Ask whether a stool softener, fiber, or extra fluids would help prevent constipation. Your care te… 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 Clidinium 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 Buprenorphine
Keep reading about Clidinium
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