Drug interactions
Brexpiprazole + Butabarbital
Severity: Major
Brexpiprazole and Butabarbital: 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
Barbiturates produce marked CNS depression that adds to the sedation of brexpiprazole. Butabarbital is also an enzyme inducer and may lower brexpiprazole exposure over time, reducing efficacy.
What this interaction means in plain words
Brexpiprazole and Butabarbital 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 induction of CYP3A4 by barbiturates increasing brexpiprazole clearance.
What to do
Monitor sedation and respiratory status and watch for loss of antipsychotic effect. Increase brexpiprazole dose as needed per labeling for CYP3A4 inducers, or choose an alternative hypnotic.
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 Butabarbital?
MediHelp rates the interaction as major. Brexpiprazole and Butabarbital 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. Barbiturates produce marked CNS depression that adds to the sedation of brexpiprazole. Butabarbital is also an enzyme inducer and may lower brexpiprazole exposure over time, reducing efficacy.
How serious is the interaction between Brexpiprazole and Butabarbital?
MediHelp rates it major, 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 antipsychotic effect. Increase brexpiprazole dose as needed per labeling for CYP3A4 inducers, or choose an alternative hypnotic.
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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