Please note that you should never self-prescribe TCM ingredients. A TCM ingredient is almost never eaten on its own but as part of a formula containing several ingredients that act together. Please consult a professional TCM practitioner, they will be best able to guide you.
Preparation: Collect the leaves and dry.
Dosage: 6-15 grams
Main actions according to TCM*: Expels hot phlegm in the Lungs and redirects rebellious Lung Qi. Cools stomach Heat and redirects rebellious Stomach Qi. Relieves cough and vomiting.
Source date: 1658 AD
Number of ingredients: 9 herbs
Formula key actions: Clears dryness. Moistens the Lungs.
Pi Pa Ye is an assistant ingredient in Qing Zao Jiu Fei Tang. This means that it either serves to reinforces the effect of other ingredients or it moderates their toxicity.
In Traditional Chinese Medicine (TCM), Pi Pa Ye belongs to the 'Herbs that relieve coughing and wheezing' category. In TCM Phlegm is a condition of Stagnation of Fluids which tends to start in the Spleen and then goes to the Lungs. If this overly accumulates it thickens and becomes pathological Phlegm. Phlegm, being a form of Stagnation, often starts as being Cool and transforms to Hot as the condition progresses. Herbs that relieve coughing and wheezing treat branch symptoms of this Stagnation and tend to have antitussive, expectorant, diuretic or laxative properties.
Furthermore Pi Pa Ye is Cool in nature. This means that Pi Pa Ye tends to help people who have too much 'Heat' in their body, although with less effect than a plant that would be Cold in nature. Balance between Yin and Yang is a key health concept in TCM. Those who have too much Heat in their body are said to either have a Yang Excess (because Yang is Hot in nature) or a Yin deficiency (Yin is Cold in Nature). Depending on your condition Pi Pa Ye can help restore a harmonious balance between Yin and Yang.
Pi Pa Ye also tastes Bitter. The so-called 'Five Phases' theory in Chinese Medicine states that the taste of TCM ingredients is a key determinant of their action in the body. Bitter ingredients like Pi Pa Ye tends to have a cleansing action on the body by clearing Heat, drying Dampness and promoting elimination via urination or bowel movements.
The tastes of ingredients in TCM also determine what Organs and Meridians they target. As such Pi Pa Ye is thought to target the Stomach and the Lung. In TCM the Stomach is responsible for receiving and ripening ingested food and fluids. It is also tasked with descending the digested elements downwards to the Small Intestine. In addition to performing respiration, the Lungs are thought in TCM to be a key part of the production chain for Qi and the Body Fluids that nourish the body.
A study on rabbits has shown that Loquat leaves exhibit anti-inflammatory activity, have anti-viral properties and a significant hypoglycemic effect.1
1. Nunziatina De Tommasi, Francesco De Simone, Cosimo Pizza, Naheed Mahmood, Patrick S. Moore, Cinzia Conti, Nicola Orsi, and Maria L. Stein (1992). Constituents of Eriobotrya japonica. A Study of Their Antiviral Properties. Journal of Natural Products 55 (8), 1067-1073. DOI: 10.1021/np50086a006