Drug interactions
Pentobarbital + Pimozide
Severity: Moderate
Pentobarbital and Pimozide: 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
Both agents depress the CNS, so combined use can cause marked sedation and impaired psychomotor performance. Pentobarbital is also a CYP3A4 inducer and may lower pimozide exposure with repeated dosing, reducing antipsychotic effect.
What this interaction means in plain words
Pentobarbital and Pimozide 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
Additive CNS depression, plus barbiturate induction of CYP3A4-mediated pimozide metabolism.
What to do
Monitor sedation and respiratory status, and watch for loss of pimozide efficacy during prolonged barbiturate use. Adjust doses based on clinical response.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Frequently asked questions
Can I take Pentobarbital with Pimozide?
MediHelp rates the interaction as moderate. Pentobarbital and Pimozide 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. Both agents depress the CNS, so combined use can cause marked sedation and impaired psychomotor performance. Pentobarbital is also a CYP3A4 inducer and may lower pimozide exposure with repeated dosing, reducing antipsychotic effect.
How serious is the interaction between Pentobarbital and Pimozide?
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 sedation and respiratory status, and watch for loss of pimozide efficacy during prolonged barbiturate use. Adjust doses based on clinical response.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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