Drug interactions
Methohexital + Pentazocine
Severity: Major
Methohexital 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
Methohexital is a barbiturate anaesthetic that causes profound CNS and respiratory depression, and opioids add to this effect. Together they raise the risk of excessive sedation, hypoventilation and hypotension.
What this interaction means in plain words
Methohexital 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.
Methohexital belongs to Central Nervous System; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive CNS and respiratory depression from opioid receptor activation and GABA-A potentiation.
What to do
Use only in monitored settings with airway equipment and reduced doses titrated to effect. Monitor oxygen saturation, respiration and blood pressure continuously.
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 Methohexital
Frequently asked questions
Can I take Methohexital with Pentazocine?
MediHelp rates the interaction as major. Methohexital 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. Methohexital is a barbiturate anaesthetic that causes profound CNS and respiratory depression, and opioids add to this effect. Together they raise the risk of excessive sedation, hypoventilation and hypotension.
How serious is the interaction between Methohexital 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: Use only in monitored settings with airway equipment and reduced doses titrated to effect. Monitor oxygen saturation, respiration and blood pressure continuously.
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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