Drug interactions
Pentobarbital + Risperidone
Severity: Moderate
Pentobarbital and Risperidone: 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
Pentobarbital is a barbiturate with strong sedative effects. With risperidone, additive CNS depression, hypotension and impaired alertness can occur. Barbiturates may also lower risperidone exposure through enzyme induction.
What this interaction means in plain words
Pentobarbital and Risperidone 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 CYP3A4 induction by barbiturates that may reduce risperidone exposure.
What to do
Monitor sedation and respiratory status, and reassess antipsychotic response if barbiturate therapy is prolonged. Adjust the risperidone dose according to clinical effect.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Pentobarbital with Risperidone?
MediHelp rates the interaction as moderate. Pentobarbital and Risperidone 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. Pentobarbital is a barbiturate with strong sedative effects. With risperidone, additive CNS depression, hypotension and impaired alertness can occur. Barbiturates may also lower risperidone exposure through enzyme induction.
How serious is the interaction between Pentobarbital and Risperidone?
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 reassess antipsychotic response if barbiturate therapy is prolonged. Adjust the risperidone dose according to clinical effect.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
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