Symptom → Plant Sources
Butterbur (Petasites hybridus) as a tool for helping with Asthma
Evidence
Antispasmodic support in bronchial asthma
Petasites hybridus (Butterbur root) extract in the treatment of asthma--an open trial
Find this paper In an open trial, a butterbur (Petasites hybridus) root extract reduced the number, duration and severity of asthma attacks and improved peak flow and FEV1, with many patients reducing their asthma medication, supporting an antispasmodic/bronchodilator use of butterbur.
2 sources supporting Butterbur for Asthma. Includes scientific publications, books, monographs and traditional-use references.
Mechanistic basis
This use is associated with the plant's bronchodilator / anti-asthmatic action.