Drug interactions
Buprenorphine + Morphine
Severity: Major
Buprenorphine 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
Buprenorphine is a high-affinity partial mu agonist and can displace morphine from receptors, which may reduce analgesia or precipitate withdrawal in opioid-dependent patients. Additive sedation and respiratory depression can also occur.
What this interaction means in plain words
Buprenorphine 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.
Buprenorphine belongs to Musculoskeletal; Morphine belongs to Musculoskeletal.
Why it happens
Partial agonism with high receptor affinity at mu-opioid receptors competes with and can antagonize full agonist effects, while also adding to CNS depression.
What to do
Avoid routine combination; if switching, follow a structured transition protocol and monitor for withdrawal and inadequate analgesia. If both are essential, use the lowest doses and monitor respiratory status closely.
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
Other interactions of Buprenorphine
- Alvimopan + Buprenorphine Contraindicated
- Buprenorphine + Calcium / magnesium / potassium / sodium oxybates Contraindicated
- Buprenorphine + Olanzapine / samidorphan Contraindicated
- Buprenorphine + Phenelzine Contraindicated
- Buprenorphine + Pimozide Contraindicated
- Buprenorphine + Thioridazine Contraindicated
Frequently asked questions
Can I take Buprenorphine with Morphine?
MediHelp rates the interaction as major. Buprenorphine 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. Buprenorphine is a high-affinity partial mu agonist and can displace morphine from receptors, which may reduce analgesia or precipitate withdrawal in opioid-dependent patients. Additive sedation and respiratory depression can also occur.
How serious is the interaction between Buprenorphine 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 routine combination; if switching, follow a structured transition protocol and monitor for withdrawal and inadequate analgesia. If both are essential, use the lowest doses and monitor respiratory status closely.
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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