Drug interactions
Clonazepam + Pentazocine
Severity: Major
Clonazepam 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. Regulators have issued boxed warnings for this class combination, and it applies to pentazocine and clonazepam.
What this interaction means in plain words
Clonazepam 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.
Clonazepam belongs to Central Nervous System; 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 and caregivers about warning signs and avoiding 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 Clonazepam
- Calcium / magnesium / potassium / sodium oxybates + Clonazepam Contraindicated
- Clonazepam + Sodium oxybate Contraindicated
- Alfentanil + Clonazepam Major
- Alprazolam + Clonazepam Major
- Amobarbital + Clonazepam Major
- Belladonna and opium + Clonazepam Major
Frequently asked questions
Can I take Clonazepam with Pentazocine?
MediHelp rates the interaction as major. Clonazepam 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. Regulators have issued boxed warnings for this class combination, and it applies to pentazocine and clonazepam.
How serious is the interaction between Clonazepam 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 and caregivers about warning signs and avoiding 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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