Drug interactions
Brimonidine + Phenobarbital
Severity: Moderate
Brimonidine and Phenobarbital: 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
Phenobarbital causes dose-related sedation. Systemic brimonidine may add to drowsiness and reduced alertness.
What this interaction means in plain words
Brimonidine and Phenobarbital 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 from GABA-A potentiation and central alpha-2 agonism.
What to do
Monitor for excessive sedation, particularly in children, older adults, or after dose changes. Advise against driving until tolerance is established.
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 Brimonidine
- Brimonidine + Isocarboxazid Contraindicated
- Brimonidine + Linezolid Contraindicated
- Brimonidine + Phenelzine Contraindicated
- Brimonidine + Procarbazine Contraindicated
- Brimonidine + Rasagiline Contraindicated
- Brimonidine + Selegiline Contraindicated
Frequently asked questions
Can I take Brimonidine with Phenobarbital?
MediHelp rates the interaction as moderate. Brimonidine and Phenobarbital 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. Phenobarbital causes dose-related sedation. Systemic brimonidine may add to drowsiness and reduced alertness.
How serious is the interaction between Brimonidine and Phenobarbital?
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 for excessive sedation, particularly in children, older adults, or after dose changes. Advise against driving until tolerance is established.
What other medicines interact with Brimonidine?
MediHelp also lists interactions of Brimonidine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Brimonidine page.
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