Drug interactions
Brexpiprazole + Pentobarbital
Severity: Major
Brexpiprazole and Pentobarbital: major interaction.
Last updated Sources: Health Canada product monograph
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 induces CYP3A4 and can substantially lower brexpiprazole concentrations, risking loss of psychiatric control. Both drugs are also sedating, so additive drowsiness and respiratory depression may occur.
What this interaction means in plain words
Brexpiprazole 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
CYP3A4 induction by the barbiturate increases brexpiprazole clearance, plus additive CNS depression.
What to do
With prolonged barbiturate use, increase the brexpiprazole dose gradually toward double the usual dose over 1 to 2 weeks and monitor response. Reduce brexpiprazole back to the usual dose after the inducer is stopped, and monitor sedation.
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 Brexpiprazole
Frequently asked questions
Can I take Brexpiprazole with Pentobarbital?
MediHelp rates the interaction as major. Brexpiprazole 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 induces CYP3A4 and can substantially lower brexpiprazole concentrations, risking loss of psychiatric control. Both drugs are also sedating, so additive drowsiness and respiratory depression may occur.
How serious is the interaction between Brexpiprazole 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: With prolonged barbiturate use, increase the brexpiprazole dose gradually toward double the usual dose over 1 to 2 weeks and monitor response. Reduce brexpiprazole back to the usual dose after the inducer is stopped, and monitor sedation.
What other medicines interact with Brexpiprazole?
MediHelp also lists interactions of Brexpiprazole with, for example, Alfentanil, Amisulpride, Apalutamide. The full list is on the Brexpiprazole page.
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