Drug interactions
Carisoprodol + Diazepam
Severity: Major
Carisoprodol and Diazepam: 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 converted to meprobamate, a sedative with barbiturate-like activity, and together with diazepam can cause marked sedation and respiratory depression. Misuse of this combination is also a recognised concern.
What this interaction means in plain words
Carisoprodol and Diazepam 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; Diazepam belongs to Musculoskeletal.
Why it happens
Additive CNS and respiratory depression through GABA-A modulation by diazepam and by meprobamate.
What to do
Avoid the combination where possible and limit carisoprodol to short courses. If used together, use the lowest doses and monitor sedation and respiratory status.
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 Diazepam
Other interactions of Carisoprodol
Frequently asked questions
Can I take Carisoprodol with Diazepam?
MediHelp rates the interaction as major. Carisoprodol and Diazepam 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 converted to meprobamate, a sedative with barbiturate-like activity, and together with diazepam can cause marked sedation and respiratory depression. Misuse of this combination is also a recognised concern.
How serious is the interaction between Carisoprodol and Diazepam?
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 and limit carisoprodol to short courses. If used together, use the lowest doses and monitor sedation and respiratory status.
What other medicines interact with Diazepam?
MediHelp also lists interactions of Diazepam with, for example, Calcium / magnesium / potassium / sodium oxybates, Alfentanil, Alprazolam. The full list is on the Diazepam page.
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