Medication·Interactions·Reviewed June 9, 2026
Fexofenadine interactions.
Fexofenadine has 3 documented interactions in the NutriStack database. The full interaction list is below. None of this is a substitute for your prescriber's advice.
Fexofenadine at a glance.
A quick, data-grounded summary. The full tables are below.
Fexofenadine has 3 documented interactions in the NutriStack database. The full interaction list is below. None of this is a substitute for your prescriber's advice.
Substances that interact with fexofenadine.
Every supplement and medication in the NutriStack database with a documented interaction with this drug, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Quercetin | Caution | High-dose quercetin can raise fexofenadine exposure. In a controlled volunteer study, quercetin 500 mg three times daily for 7 days increased... details → |
| St. John's Wort | Caution | St. John's Wort can change fexofenadine exposure through transporter effects. A single St. John's Wort dose increased fexofenadine peak... details → |
| Green Tea Extract | Timing Sensitive | Green tea extract can sharply reduce fexofenadine absorption when taken together. In a randomized crossover study, an EGCG-rich green tea extract... details → |
The full fexofenadine profile.
Uses, typical dosing, side effects, and the cited evidence for this medication.
Common fexofenadine questions.
Quick answers drawn from the tables above.
What interacts with Fexofenadine?
In the NutriStack database, Fexofenadine has 3 documented interactions. The most notable include Quercetin, St. John's Wort, and Green Tea Extract. Check any specific combination before taking it and confirm with your prescriber.
Is it safe to take Quercetin with Fexofenadine?
NutriStack classifies the Quercetin and Fexofenadine pairing as caution: High-dose quercetin can raise fexofenadine exposure. In a controlled volunteer study, quercetin 500 mg three times daily for 7 days increased fexofenadine AUC by 55%... Use caution with high-dose quercetin if you also take fexofenadine daily. Keep the quercetin dose consistent and watch for new drowsiness,... Always confirm with your prescriber.
Check your whole stack
See how fexofenadine fits your supplements.
NutriStack screens your full routine for interactions and depletions, and updates the moment you change it.