Drug interactions
Pentobarbital + Quinidine
Severity: Moderate
Pentobarbital and Quinidine: moderate 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
Barbiturates induce hepatic enzymes and can lower quinidine concentrations, potentially causing loss of efficacy. Additive CNS depression is not a concern from quinidine itself but the loss of antiarrhythmic control may be.
What this interaction means in plain words
Pentobarbital and Quinidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Pentobarbital induces CYP3A4, increasing quinidine clearance.
What to do
Monitor quinidine concentrations and ECG response, increasing the dose if needed. Reassess dosing when the barbiturate is stopped to avoid toxicity.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Quinidine
- Adagrasib + Quinidine Contraindicated
- Arsenic trioxide + Quinidine Contraindicated
- Artemether / lumefantrine + Quinidine Contraindicated
- Chloroquine + Quinidine Contraindicated
- Dofetilide + Quinidine Contraindicated
- Dronedarone + Quinidine Contraindicated
Frequently asked questions
Can I take Pentobarbital with Quinidine?
MediHelp rates the interaction as moderate. Pentobarbital and Quinidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Barbiturates induce hepatic enzymes and can lower quinidine concentrations, potentially causing loss of efficacy. Additive CNS depression is not a concern from quinidine itself but the loss of antiarrhythmic control may be.
How serious is the interaction between Pentobarbital and Quinidine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor quinidine concentrations and ECG response, increasing the dose if needed. Reassess dosing when the barbiturate is stopped to avoid toxicity.
What other medicines interact with Quinidine?
MediHelp also lists interactions of Quinidine with, for example, Adagrasib, Arsenic trioxide, Artemether / lumefantrine. The full list is on the Quinidine page.
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