Drug interactions
Morphine + Nalbuphine
Severity: Major
Morphine and Nalbuphine: 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
Nalbuphine is a mixed kappa-agonist and mu-antagonist and may partly reverse morphine analgesia. In patients physically dependent on morphine it can precipitate withdrawal. In opioid-naive patients the two add to sedation and respiratory depression.
What this interaction means in plain words
Morphine and Nalbuphine 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.
Morphine belongs to Musculoskeletal; Nalbuphine belongs to Musculoskeletal.
Why it happens
Nalbuphine competes at mu-opioid receptors as an antagonist or partial antagonist while adding to opioid CNS and respiratory depression.
What to do
Avoid giving nalbuphine to patients on regular morphine unless reversal of opioid effects is intended. If used, give small doses and monitor for withdrawal, loss of analgesia and respiratory depression.
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 Nalbuphine
- Alvimopan + Nalbuphine Contraindicated
- Nalbuphine + Olanzapine / samidorphan Contraindicated
- Alprazolam + Nalbuphine Major
- Amobarbital + Nalbuphine Major
- Benzhydrocodone / acetaminophen + Nalbuphine Major
- Brexanolone + Nalbuphine Major
Frequently asked questions
Can I take Morphine with Nalbuphine?
MediHelp rates the interaction as major. Morphine and Nalbuphine 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. Nalbuphine is a mixed kappa-agonist and mu-antagonist and may partly reverse morphine analgesia. In patients physically dependent on morphine it can precipitate withdrawal. In opioid-naive patients the two add to sedation and respiratory depression.
How serious is the interaction between Morphine and Nalbuphine?
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 giving nalbuphine to patients on regular morphine unless reversal of opioid effects is intended. If used, give small doses and monitor for withdrawal, loss of analgesia and respiratory depression.
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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