Dicyclomine 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
Dicyclomine
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 pain and addiction medicine, and opioids are well known for causing constipation. Dicyclomine (Bentyl) is used for stomach cramps and also slows how your intestines move. When you take them together, those effects can add up.
In rare cases, the gut can slow down so much that it nearly stops. This is called paralytic ileus. You might also have trouble emptying your bladder. Watch for a bloated, painful belly, no bowel movements, throwing up, or being unable to pee. The good news is your care team can manage this by keeping an eye on you and adjusting things if needed.
Effect: Additive reduction in GI motility and smooth muscle tone, raising the risk of severe constipation, urinary retention, and potentially paralytic ileus.
Mechanism: Pharmacodynamic (additive), not pharmacokinetic. Buprenorphine reduces gut motility via mu-opioid receptor activity; dicyclomine adds antimuscarinic/antispasmodic slowing of GI and bladder smooth muscle. Neither is a prodrug relevant here.
- Direction/magnitude: Additive; magnitude unspecified
- Onset: Unspecified
- Evidence: Theoretical
- Monitor: Bowel function, abdominal distension, signs of ileus, and urinary retention
Consider bowel regimen, dose individualization, and closer monitoring; reassess if obstructive symptoms emerge.
What happens
An increased risk of paralytic ileus
Interaction Deep Dive
Using buprenorphine together with an anticholinergic drug can lead to urinary retention or serious constipation that progresses to paralytic ileus. When these agents are given concurrently, watch patients for indications of urinary retention or diminished 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 interaction is based on theoretical, additive effects, so it can usually be managed with awareness and monitoring.
- Your care team may monitor your bowel and bladder function more closely, and doses may be adjusted and individualized if needed.
- Stay hydrated and stay active if you are able, and ask about a stool-softener or laxative plan.
- Call your pharmacist or prescriber promptly if you notice a swollen, painful belly, no bowel movement for several days, nausea or vomiting, or trouble urinating.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Dicyclomine and Buprenorphine together?
Taking buprenorphine with dicyclomine can add up to slow your gut and bladder, so watch for severe constipation or trouble urinating and report those symptoms to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Dicyclomine 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 Dicyclomine and Buprenorphine interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This interaction is based on theoretical, additive effects, so it can usually be managed with awareness and monitoring. Your care team may monitor your bowel and bladder function more closely, and doses may be adjusted and individualized if needed. Stay hydrated and stay active if you are able, and ask about a sto… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Dicyclomine 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 Dicyclomine
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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