Drug interactions
Clonazepam + Pentobarbital
Severity: Major
Clonazepam and Pentobarbital: 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
Pentobarbital and clonazepam both depress the central nervous system, and together can cause marked sedation and respiratory depression. Barbiturates may also lower clonazepam exposure through enzyme induction, making the net effect unpredictable.
What this interaction means in plain words
Clonazepam 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 GABA-A mediated CNS depression, with barbiturate-induced CYP3A4 metabolism of clonazepam.
What to do
Monitor respiratory status and level of sedation and use the lowest effective doses of each drug. Reassess clonazepam efficacy if the barbiturate is given long term.
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 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 Pentobarbital?
MediHelp rates the interaction as major. Clonazepam 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. Pentobarbital and clonazepam both depress the central nervous system, and together can cause marked sedation and respiratory depression. Barbiturates may also lower clonazepam exposure through enzyme induction, making the net effect unpredictable.
How serious is the interaction between Clonazepam 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: Monitor respiratory status and level of sedation and use the lowest effective doses of each drug. Reassess clonazepam efficacy if the barbiturate is given long term.
What other medicines interact with Clonazepam?
MediHelp also lists interactions of Clonazepam with, for example, Calcium / magnesium / potassium / sodium oxybates, Sodium oxybate, Alfentanil. The full list is on the Clonazepam page.
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