Drug interactions
Diazepam + Pentazocine
Severity: Major
Diazepam and Pentazocine: 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
Opioids combined with benzodiazepines can cause profound sedation, respiratory depression, coma and death. Pentazocine with diazepam carries this class risk, and diazepam's long-acting metabolites prolong exposure.
What this interaction means in plain words
Diazepam and Pentazocine 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.
Diazepam belongs to Musculoskeletal; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive central nervous system and respiratory depression via opioid receptor and GABA-A receptor activity.
What to do
Avoid concurrent use when possible; if needed, use the lowest doses for the shortest duration and monitor for respiratory depression and sedation. Counsel patients to avoid 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 Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
Other interactions of Diazepam
Frequently asked questions
Can I take Diazepam with Pentazocine?
MediHelp rates the interaction as major. Diazepam and Pentazocine 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. Opioids combined with benzodiazepines can cause profound sedation, respiratory depression, coma and death. Pentazocine with diazepam carries this class risk, and diazepam's long-acting metabolites prolong exposure.
How serious is the interaction between Diazepam and Pentazocine?
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 when possible; if needed, use the lowest doses for the shortest duration and monitor for respiratory depression and sedation. Counsel patients to avoid alcohol.
What other medicines interact with Pentazocine?
MediHelp also lists interactions of Pentazocine with, for example, Calcium / magnesium / potassium / sodium oxybates, Olanzapine / samidorphan, Phenelzine. The full list is on the Pentazocine page.
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