Drug interactions
Buprenorphine long-acting + Morphine
Severity: Major
Buprenorphine long-acting and Morphine: 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
Combining morphine with long-acting buprenorphine injection adds opioid-related sedation and respiratory depression. Buprenorphine's high receptor affinity and prolonged presence can also partly block morphine's analgesia, making pain control unpredictable and overdose risk difficult to manage.
What this interaction means in plain words
Buprenorphine long-acting and Morphine 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
Additive mu-opioid CNS and respiratory depression, with competitive receptor binding by buprenorphine, a partial agonist with high affinity.
What to do
Avoid the combination where alternatives exist; if both are needed, use the lowest effective morphine dose with monitoring of sedation and respiratory rate. Ensure naloxone is accessible.
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 Morphine
- Alvimopan + Morphine Contraindicated
- Isocarboxazid + Morphine Contraindicated
- Morphine + Olanzapine / samidorphan Contraindicated
- Morphine + Phenelzine Contraindicated
- Morphine + Tranylcypromine Contraindicated
- Alfentanil + Morphine Major
Frequently asked questions
Can I take Buprenorphine long-acting with Morphine?
MediHelp rates the interaction as major. Buprenorphine long-acting and Morphine 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. Combining morphine with long-acting buprenorphine injection adds opioid-related sedation and respiratory depression. Buprenorphine's high receptor affinity and prolonged presence can also partly block morphine's analgesia, making pain control unpredictable and overdose risk difficult to manage.
How serious is the interaction between Buprenorphine long-acting and Morphine?
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 the combination where alternatives exist; if both are needed, use the lowest effective morphine dose with monitoring of sedation and respiratory rate. Ensure naloxone is accessible.
What other medicines interact with Morphine?
MediHelp also lists interactions of Morphine with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Morphine page.
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