Drug interactions
Gabapentin + Morphine
Severity: Major
Gabapentin and Morphine: major interaction.
Last updated
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 gabapentin increases sedation and the risk of respiratory depression. Gabapentin can also raise morphine exposure modestly. Regulators have warned about serious breathing problems when gabapentinoids are combined with opioids, especially in older or respiratory-compromised patients.
What this interaction means in plain words
Gabapentin 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.
Gabapentin belongs to Central Nervous System; Morphine belongs to Musculoskeletal.
Why it happens
Additive CNS and respiratory depression, with a possible modest increase in morphine exposure.
What to do
Start with the lowest effective doses and titrate slowly, reducing the opioid dose if needed. Monitor for sedation and respiratory depression, particularly in the elderly, renal impairment or lung disease.
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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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 Gabapentin
Frequently asked questions
Can I take Gabapentin with Morphine?
MediHelp rates the interaction as major. Gabapentin 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 gabapentin increases sedation and the risk of respiratory depression. Gabapentin can also raise morphine exposure modestly. Regulators have warned about serious breathing problems when gabapentinoids are combined with opioids, especially in older or respiratory-compromised patients.
How serious is the interaction between Gabapentin 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: Start with the lowest effective doses and titrate slowly, reducing the opioid dose if needed. Monitor for sedation and respiratory depression, particularly in the elderly, renal impairment or lung disease.
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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