Is Fexofenadine Safe with Butterbur?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Combining butterbur with fexofenadine may be acceptable but should be discussed with a healthcare provider. Monitor for over-sedation or excessive allergy symptom suppression.
Why this interaction occurs
Butterbur (Petasites hybridus) exhibits antihistamine-like and leukotriene-inhibiting properties. When combined with fexofenadine, additive H1-receptor antagonism may occur, potentially causing greater symptom relief but also increasing risk of overlapping side effects.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 59 reports mentioning Butterbur. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Butterbur + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Fexofenadine interactions → · All Butterbur interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.