Maximum Dose of Fexofenadine
The maximum recommended dose of fexofenadine is 180 mg once daily (or 60 mg twice daily, which equals 120 mg/day) for adults and adolescents ≥12 years, and 30 mg twice daily (60 mg/day total) for children 6-11 years. 1
Dosing by Age Group
Adults and Adolescents ≥12 Years
- Standard dosing: 60 mg twice daily OR 180 mg once daily 1
- Maximum daily dose: 180 mg/day
- Renal impairment: Start with 60 mg once daily 1
Children 6-11 Years
- Standard dosing: 30 mg twice daily 1
- Maximum daily dose: 60 mg/day
- Renal impairment: Start with 30 mg once daily 1
Children 2-5 Years
- Standard dosing: 30 mg twice daily 2
- This age group requires liquid formulation (not tablets)
Important Safety Considerations
Fexofenadine has an exceptional safety profile even at supratherapeutic doses. Research demonstrates no sedation or cardiac effects at doses up to 800 mg once daily or 690 mg twice daily for 28 days 3. This distinguishes fexofenadine from other second-generation antihistamines:
- No sedation: Fexofenadine does not penetrate the blood-brain barrier and causes no sedation even at doses exceeding FDA-approved levels 4, 5
- No cardiac effects: No QTc prolongation occurs even at 10-fold higher than therapeutic doses 3
- No drug interactions: Safe when combined with erythromycin or ketoconazole 3
Comparison with Other Antihistamines
Unlike loratadine and desloratadine (which may cause sedation at higher-than-recommended doses) or cetirizine (which causes sedation at standard 10 mg doses in 13.7% of patients), fexofenadine maintains its non-sedating profile regardless of dose 4.
Clinical Pearls
- Do not exceed labeled maximum doses in routine practice: While research shows safety at much higher doses, the FDA-approved maximum (180 mg/day for adults, 60 mg/day for children 6-11 years) provides optimal efficacy 1
- Adjust for renal impairment: Reduce starting dose by 50% in patients with decreased renal function 1
- Take with water only: Avoid fruit juices which can decrease absorption
- Pediatric efficacy proven: Fexofenadine 30 mg twice daily shows statistical superiority over placebo for all symptoms including nasal congestion in children 6-11 years 6