Drug interactions
Buprenorphine long-acting + Fentanyl
Severity: Major
Buprenorphine long-acting and Fentanyl: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Long-acting buprenorphine injections sustain high mu-receptor occupancy, which can reduce fentanyl effect while still contributing to sedation and respiratory depression. Pain management becomes unpredictable.
What this interaction means in plain words
Buprenorphine long-acting and Fentanyl can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Partial agonist receptor occupancy competes with fentanyl, plus additive CNS depression.
What to do
Avoid unless alternatives are inadequate; use monitored settings with careful titration and watch for respiratory depression and withdrawal.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Fentanyl
- Alvimopan + Fentanyl Contraindicated
- Fentanyl + Isocarboxazid Contraindicated
- Fentanyl + Olanzapine / samidorphan Contraindicated
- Fentanyl + Phenelzine Contraindicated
- Fentanyl + Tranylcypromine Contraindicated
- Alfentanil + Fentanyl Major
Frequently asked questions
Can I take Buprenorphine long-acting with Fentanyl?
MediHelp rates the interaction as major. Buprenorphine long-acting and Fentanyl can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Long-acting buprenorphine injections sustain high mu-receptor occupancy, which can reduce fentanyl effect while still contributing to sedation and respiratory depression. Pain management becomes unpredictable.
How serious is the interaction between Buprenorphine long-acting and Fentanyl?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid unless alternatives are inadequate; use monitored settings with careful titration and watch for respiratory depression and withdrawal.
What other medicines interact with Fentanyl?
MediHelp also lists interactions of Fentanyl with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Fentanyl page.
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