Drug interactions
Pentazocine + Pentobarbital
Severity: Major
Pentazocine and Pentobarbital: 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
Combining an opioid with a barbiturate can produce profound sedation, respiratory depression, coma and death. Pentobarbital is typically used for anesthesia or severe sedation, so the risk is greatest when doses are not carefully controlled.
What this interaction means in plain words
Pentazocine and Pentobarbital 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 central nervous system and respiratory depression via opioid receptor and GABA-A receptor mechanisms.
What to do
Avoid the combination when possible; if needed, use the lowest effective doses with continuous monitoring of respiratory rate, oxygen saturation and level of consciousness. Ensure resuscitation equipment is available.
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 Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
Frequently asked questions
Can I take Pentazocine with Pentobarbital?
MediHelp rates the interaction as major. Pentazocine and Pentobarbital 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. Combining an opioid with a barbiturate can produce profound sedation, respiratory depression, coma and death. Pentobarbital is typically used for anesthesia or severe sedation, so the risk is greatest when doses are not carefully controlled.
How serious is the interaction between Pentazocine and Pentobarbital?
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 when possible; if needed, use the lowest effective doses with continuous monitoring of respiratory rate, oxygen saturation and level of consciousness. Ensure resuscitation equipment is available.
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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