Drug interactions
Fentanyl transdermal + Fexofenadine
Severity: Minor
Fentanyl transdermal 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
Fexofenadine is a second-generation antihistamine that rarely causes sedation, so it adds little to the CNS depression of transdermal fentanyl. The interaction is mainly theoretical.
What this interaction means in plain words
Fentanyl transdermal 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.
Why it happens
Fexofenadine has minimal CNS penetration, so additive sedative effects are only theoretical.
What to do
No dose change is needed; continue routine monitoring of sedation and breathing during fentanyl therapy.
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
Frequently asked questions
Can I take Fentanyl transdermal with Fexofenadine?
MediHelp rates the interaction as minor. Fentanyl transdermal 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. Fexofenadine is a second-generation antihistamine that rarely causes sedation, so it adds little to the CNS depression of transdermal fentanyl. The interaction is mainly theoretical.
How serious is the interaction between Fentanyl transdermal 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 change is needed; continue routine monitoring of sedation and breathing during fentanyl therapy.
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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