Hempleaf Negundo Chastetree Leaf Classic Formulas … Natural Herb Library

Primary Actions

Releases the exterior and transforms dampness - Mu Jing Ye is used for wind-cold or damp-type early illness with headache, heaviness, body discomfort, and lingering exterior obstruction.
Transforms phlegm and calms wheezing - traditional indications include cough, abundant phlegm, and asthma-like breathing difficulty.
Regulates the middle and relieves pain - older use extends to abdominal pain, damp summer disorders, and dysenteric or gastroenteritic patterns.
Resolves toxicity and relieves itching - external use includes rashes, foot fungal conditions, swollen breasts, and bites or minor toxic swellings.

Leaf-decoction exterior and cough treatments - traditional use for wind-cold with phlegm or wheezing.
Mu Jing Ye washes and poultices - local-use strategy for itching, damp skin problems, and toxic swelling.
Respiratory combinations with qi-descending or phlegm-transforming herbs - the practical pattern when cough and wheeze dominate.

The official Chinese reference platform describes Mu Jing Ye as pungent, bitter, and neutral, with actions of releasing the exterior, transforming dampness, relieving wheezing, and resolving toxicity.
Broader Chinese materia medica summaries place the leaf in a Lung-Liver-Stomach style pattern space, reflecting its use for respiratory, damp, and pain presentations.