Fexofenadine: prescribing and clinical use
Focused clinical detail for use alongside current product information, local policy and patient-specific assessment.
Fexofenadine: clinical details
Prescribing considerations
- Confirm the selected product's licensed indication and age group.
- Seek medical oversight in older people and those with renal or hepatic impairment because product-specific experience is limited.
- Assess current or previous cardiovascular disease because tachycardia and palpitations have been reported with antihistamines.
- Review antacids, fruit-juice intake and medicines affecting P-glycoprotein or OATP transport.
Contraindications and cautions
- Hypersensitivity to fexofenadine hydrochloride or any product excipient.
Monitoring
- Routine laboratory monitoring is not specified; assess symptom response and adverse effects clinically.
- Advise prompt assessment of palpitations or tachycardia.
- During breastfeeding, monitor the infant for drowsiness, irritability, poor feeding and inadequate weight gain.
Clinical pharmacology
Fexofenadine is the active metabolite of terfenadine and selectively antagonises peripheral H1 receptors. It is rapidly absorbed, is 60–70% protein bound, undergoes negligible metabolism and is eliminated mainly through biliary excretion, with a smaller unchanged urinary component. It is a P-glycoprotein and OATP substrate.
Formulation and product differences
- The selected products are oral, pink, oval, biconvex film-coated tablets marked “FXF” and “180”.
- They contain Allura Red AC Lake (E129), which may cause allergic reactions.
- Excipients and tablet appearance can differ between manufacturers; check the product-specific SmPC when allergy or swallowing considerations matter.
Fexofenadine preparations and strengths
Tablet
Route: Oral
Strengths: 30 mg, 120 mg, 180 mg
Fexofenadine interactions
Check other medicines with a pharmacist or prescriber. Important examples include:
Antacids containing aluminium or magnesium
They can reduce fexofenadine absorption.
Apple, orange or grapefruit juice
These drinks can reduce absorption and make fexofenadine less effective; use water instead.
Erythromycin or ketoconazole
These P-glycoprotein inhibitors can increase fexofenadine exposure, although studied increases were not accompanied by QT changes or more adverse reactions.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.