Answer
In adult interaction studies, taking fexofenadine with erythromycin or ketoconazole increased fexofenadine plasma levels 2–3-fold, without effects on the QT interval or increased adverse reactions compared with the medicines given individually.
Sources for this answer
- Telfast 30mg tabletsOpella POM UK Limited · emc · SmPC §4.5 Interaction with other medicinal products · Version 16Document updated
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