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The dried aerial part of Eupatorium fortunei (Asteraceae). Enters the Spleen, Stomach, and Lung channels. Pungent and neutral, it is the key aromatic dampness-transforming herb, often paired with huo xiang in synergy. While pei lan is neutral and excels at transforming dampness and arousing the Spleen, huo xiang is slightly warm and excels at harmonizing the middle and stopping vomiting. The Nei Jing recommends pei lan for Spleen impediment (pi dan) with sweet taste in the mouth.
化湿解暑力强，夏令暑湿证尤宜
芳香化湿，醒脾开胃
鲜品加倍（15–30g），暑湿、湿温证以鲜佩兰为佳。不宜久煎。
Reference range for non-pregnant adults. Not a personalized prescription. Pregnancy, lactation, and pediatric use require specialist supervision.
Protective guidance only — when to avoid or use with caution. This block deliberately omits pregnancy, lactation, and pediatric dosing: any such use must be managed by a qualified TCM practitioner or appropriate specialist.
阴虚血燥者、气虚者不宜。
《黄帝内经·素问·奇病论》载有治脾瘅一方：治之以兰，除陈气也，即指本品。为治口甘苔腻、湿浊困脾之专药。不宜久煎以免香气散失。
有病口甘者，病名为何？何以得之？岐伯曰：此五气之溢也，名曰脾瘅。治之以兰，除陈气也。
@misc{bencaodian-pei-lan,
author = {{Bencaodian Editorial}},
title = {Pèi Lán 佩兰 (Eupatorium Herb) — Eupatorii Herba},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/pei-lan},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
佩兰为菊科泽兰，含挥发油及香豆素类成分，具抗炎、祛痰与抑菌作用，对应传统芳香化湿、醒脾开胃之功。
Eupatorium (Pei Lan) yields a volatile oil and coumarin compounds with anti-inflammatory, expectorant, and antimicrobial actions, corresponding to its traditional aromatic dampness-transforming and appetite-rousing use.
《中药学》（Bensky）强调佩兰常与藿香同用化湿，宜后下以保存挥发油。
Bensky notes Pei Lan is typically paired with Huo Xiang for dampness transformation and should be added late in decoction to preserve its volatile oil.
Chen & Chen 记载佩兰挥发油对多种呼吸道病原菌有抑制作用。
Chen & Chen report that Pei Lan volatile oil inhibits several respiratory pathogens in vitro.
This section is provided for academic reference only and does not constitute medical advice.