Drug interactions
Brimonidine + Fexofenadine
Severity: Minor
Brimonidine and Fexofenadine: minor 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
Brimonidine can cause drowsiness with systemic absorption, and fexofenadine is minimally sedating. A meaningful additive effect is unlikely, especially with eye drops.
What this interaction means in plain words
Brimonidine and Fexofenadine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Brimonidine belongs to Miscellaneous; Fexofenadine belongs to Respiratory.
Why it happens
Theoretical additive CNS depression; brimonidine is a central alpha-2 agonist when absorbed.
What to do
No dose changes are needed. Mention possible drowsiness to the patient.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Fexofenadine
- Danicopan + Fexofenadine Moderate
- Erdafitinib + Fexofenadine Moderate
- Fexofenadine + Glecaprevir / pibrentasvir Moderate
- Fexofenadine + Grapefruit Moderate
- Fexofenadine + Juice Moderate
- Acrivastine + Fexofenadine Minor
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 Fexofenadine?
MediHelp rates the interaction as minor. Brimonidine and Fexofenadine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Brimonidine can cause drowsiness with systemic absorption, and fexofenadine is minimally sedating. A meaningful additive effect is unlikely, especially with eye drops.
How serious is the interaction between Brimonidine and Fexofenadine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose changes are needed. Mention possible drowsiness to the patient.
What other medicines interact with Fexofenadine?
MediHelp also lists interactions of Fexofenadine with, for example, Danicopan, Erdafitinib, Glecaprevir / pibrentasvir. The full list is on the Fexofenadine page.
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