Drug interactions
Carisoprodol + Morphine
Severity: Major
Carisoprodol 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
Carisoprodol is a sedating muscle relaxant whose active metabolite meprobamate adds to the central depressant effect of morphine. Together they can produce excessive drowsiness, impaired psychomotor function and respiratory depression.
What this interaction means in plain words
Carisoprodol 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.
Carisoprodol belongs to Musculoskeletal; Morphine belongs to Musculoskeletal.
Why it happens
Additive central nervous system and respiratory depression.
What to do
Avoid the combination where possible; if it is necessary, use the lowest effective doses for the shortest duration and monitor sedation and respiratory rate. Counsel patients to avoid driving and alcohol.
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 Carisoprodol
Frequently asked questions
Can I take Carisoprodol with Morphine?
MediHelp rates the interaction as major. Carisoprodol 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. Carisoprodol is a sedating muscle relaxant whose active metabolite meprobamate adds to the central depressant effect of morphine. Together they can produce excessive drowsiness, impaired psychomotor function and respiratory depression.
How serious is the interaction between Carisoprodol 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 possible; if it is necessary, use the lowest effective doses for the shortest duration and monitor sedation and respiratory rate. Counsel patients to avoid driving and alcohol.
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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