Drug interactions
Calcium / magnesium / potassium / sodium oxybates + Morphine
Severity: Major
Calcium / magnesium / potassium / sodium oxybates 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
Oxybates are potent CNS depressants, and with morphine they can cause profound sedation, respiratory depression, coma and death. The risk is substantial even at therapeutic doses.
What this interaction means in plain words
Calcium / magnesium / potassium / sodium oxybates 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 CNS and respiratory depression through opioid receptor and GABA-B/GHB receptor effects.
What to do
Avoid concurrent use where possible; if unavoidable, use the minimum doses and durations and monitor closely for sedation and respiratory depression. Consider reducing or interrupting oxybate dosing if opioid treatment is required short term.
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
Frequently asked questions
Can I take Calcium / magnesium / potassium / sodium oxybates with Morphine?
MediHelp rates the interaction as major. Calcium / magnesium / potassium / sodium oxybates 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. Oxybates are potent CNS depressants, and with morphine they can cause profound sedation, respiratory depression, coma and death. The risk is substantial even at therapeutic doses.
How serious is the interaction between Calcium / magnesium / potassium / sodium oxybates 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 concurrent use where possible; if unavoidable, use the minimum doses and durations and monitor closely for sedation and respiratory depression. Consider reducing or interrupting oxybate dosing if opioid treatment is required short term.
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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