Drug interactions
Carisoprodol + Diamorphine
Severity: Major
Carisoprodol and Diamorphine: 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
Diamorphine (heroin) is a potent opioid, and combining it with carisoprodol causes additive CNS and respiratory depression. This raises the risk of profound sedation, respiratory failure, coma and death.
What this interaction means in plain words
Carisoprodol and Diamorphine 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.
What to do
Avoid the combination where possible; if both are required, use the lowest effective doses and monitor sedation and respiratory rate closely. Ensure naloxone access and counsel on overdose signs.
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 Carisoprodol
Frequently asked questions
Can I take Carisoprodol with Diamorphine?
MediHelp rates the interaction as major. Carisoprodol and Diamorphine 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. Diamorphine (heroin) is a potent opioid, and combining it with carisoprodol causes additive CNS and respiratory depression. This raises the risk of profound sedation, respiratory failure, coma and death.
How serious is the interaction between Carisoprodol and Diamorphine?
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 both are required, use the lowest effective doses and monitor sedation and respiratory rate closely. Ensure naloxone access and counsel on overdose signs.
What other medicines interact with Carisoprodol?
MediHelp also lists interactions of Carisoprodol with, for example, Alfentanil, Alprazolam, Amobarbital. The full list is on the Carisoprodol page.
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