Buprenorphine and Meperidine: 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
Meperidine
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.
Buprenorphine and meperidine (Demerol) don't work well together. Buprenorphine only partially turns on the body's opioid receptors, and it grips them very tightly. When it's on board, it can block meperidine from working the way it should. That means meperidine may not relieve pain well, and if you're used to full opioids, you could even feel withdrawal (sweating, chills, aches, upset stomach).
There's also a second concern: both drugs can raise a body chemical called serotonin. Too much can cause serotonin syndrome, with symptoms like agitation, fast heartbeat, fever, shakiness, or muscle stiffness. This can be serious. The good news is your care team can plan around this safely, so talk with your doctor or pharmacist before using both.
Direction: Buprenorphine, a high-affinity partial mu-opioid agonist with antagonist properties, can displace/block full agonist activity, reducing meperidine's analgesic effect and potentially precipitating withdrawal in opioid-dependent patients.
- Mechanism: opioid receptor competition/antagonism; additive serotonergic activity (meperidine is a serotonin reuptake inhibitor).
- Serotonin syndrome risk: increased; onset hours to days. Watch for mental status changes, autonomic instability, neuromuscular abnormalities, GI symptoms.
- Evidence: theoretical; severity major.
- Management: avoid concomitant use. Monitor closely during initiation/titration; discontinue offending agent(s) if serotonin syndrome is suspected.
What happens
Reduced analgesic effect or precipitation of withdrawal symptoms, and an increased risk of serotonin syndrome
Interaction Deep Dive
Do not use meperidine together with a mixed opioid agonist/antagonist or a partial agonist opioid analgesic, because this combination can diminish meperidine's analgesic effect and may trigger withdrawal symptoms. When meperidine is combined with other agents that act on the serotonergic system, monitor the patient closely, particularly at the start of therapy and during dose adjustments, since the likelihood of serotonin syndrome rises; stop treatment if it is suspected. Serotonin syndrome typically develops within hours to days, can present with altered mental status, autonomic instability, neuromuscular abnormalities, and/or gastrointestinal symptoms, and may be fatal12.
Why it happens (mechanism)
Opioid receptor antagonism; additive serotonergic effects
How to manage this interaction
The main advice here is to avoid using these two together when possible, because buprenorphine can blunt meperidine's pain relief and may trigger withdrawal, and combining them raises the risk of serotonin syndrome.
- Keep taking your medications exactly as prescribed. Do not start, stop, or change either drug on your own.
- Tell every prescriber and your pharmacist that you take both, so they can choose a safer plan or adjust and individualize your therapy.
- Your team may monitor you more closely, especially when a dose is started or changed.
- Seek help right away for agitation, fever, fast heartbeat, muscle twitching or stiffness, sweating, or stomach upset.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
Common questions
Can I take Buprenorphine and Meperidine together?
Buprenorphine can block meperidine's pain relief, may cause withdrawal, and together they raise the risk of serotonin syndrome, so this combination is generally avoided. Talk with your doctor or pharmacist before using both. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Meperidine 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 Meperidine interaction managed?
The main advice here is to avoid using these two together when possible, because buprenorphine can blunt meperidine's pain relief and may trigger withdrawal, and combining them raises the risk of serotonin syndrome. Keep taking your medications exactly as prescribed. Do not start, stop, or change either drug on your own. Tell every prescriber and your pharmacist that you take both, so they can cho… 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 Meperidine 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: MEPERGAN intramuscular, intravenous injection, meperidine HCl, promethazine HCl intramuscular, intravenous injection. West-Ward Pharmaceuticals Corp (per FDA), Eatontown, NJ, 2023.
- Product Information: Demerol(TM) intramuscular, subcutaneous, intravenous injection, meperidine HCl intramuscular, subcutaneous, intravenous injection. Hospira Inc (per FDA), Lake Forest, IL, 2022.
Keep reading about Buprenorphine
Keep reading about Meperidine
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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