Drug interactions
Pentobarbital + Perphenazine
Severity: Major
Pentobarbital and Perphenazine: 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
Pentobarbital is a barbiturate that depresses the CNS, and perphenazine adds to sedation and may lower the seizure threshold. Together they can cause marked drowsiness, hypotension and respiratory depression. Barbiturates also induce hepatic enzymes and may reduce perphenazine concentrations.
What this interaction means in plain words
Pentobarbital and Perphenazine 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 CNS depression plus CYP enzyme induction by pentobarbital that may lower perphenazine levels.
What to do
Use the lowest effective doses and monitor sedation, breathing and blood pressure. Watch for reduced antipsychotic effect with prolonged barbiturate use.
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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Pentobarbital with Perphenazine?
MediHelp rates the interaction as major. Pentobarbital and Perphenazine 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 is a barbiturate that depresses the CNS, and perphenazine adds to sedation and may lower the seizure threshold. Together they can cause marked drowsiness, hypotension and respiratory depression. Barbiturates also induce hepatic enzymes and may reduce perphenazine concentrations.
How serious is the interaction between Pentobarbital and Perphenazine?
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 the lowest effective doses and monitor sedation, breathing and blood pressure. Watch for reduced antipsychotic effect with prolonged barbiturate use.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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