Fexofenadine and Grapefruit Juice: Drug Interaction Guide

Quick answer: Fexofenadine and Grapefruit Juice have a minor interaction — typically manageable with awareness.

How Fexofenadine interacts with Grapefruit Juice

Grapefruit juice inhibits intestinal OATP1A2 transporters required for fexofenadine uptake, reducing its bioavailability by approximately 30-40%.

What you should do

Take fexofenadine with water rather than grapefruit, orange or apple juice to ensure full antihistamine effect.

Key facts

Severity

Minor — typically manageable

Mechanism

Grapefruit juice inhibits intestinal OATP1A2 transporters required for fexofenadine uptake, reducing its bioavailability...

Action

Take fexofenadine with water rather than grapefruit, orange or apple juice to ensure full antihistamine effect.

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Fexofenadine and Grapefruit Juice together?

Usually yes, with awareness. Take fexofenadine with water rather than grapefruit, orange or apple juice to ensure full antihistamine effect.

What is the severity of this interaction?

The interaction between Fexofenadine and Grapefruit Juice is classified as Minor — typically manageable. Grapefruit juice inhibits intestinal OATP1A2 transporters required for fexofenadine uptake, reducing its bioavailability by approximately 30-40%.

What should I do if I'm prescribed both?

Take fexofenadine with water rather than grapefruit, orange or apple juice to ensure full antihistamine effect. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: May 15, 2026 by iMedic Medical Editorial Team. Our editorial process.