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The dried root of Panax quinquefolius (Araliaceae), originally from North America and introduced to China during the Qing Qianlong era. Enters the Heart, Lung, and Kidney channels. Sweet, slightly bitter, and cool, it supplements qi while nourishing yin. In contrast to ren shen (warm in nature), xi yang shen provides cool supplementation without warm dryness, making it appropriate for vacuity patterns with fire exuberance and yin damage. First recorded in Ben Cao Cong Xin (Wu Yiluo, 1757).
补气养阴，清火生津
煎服3–6g，另煎兑服为佳；或研末吞服，每次0.5–1g。
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.
性凉，中阳衰微、胃有寒湿、阳气不足、寒证泄泻者忌服。不宜与藜芦同用（十八反）。
凉润之品，阳虚体质及寒湿内盛者不宜。服药期间忌饮浓茶及食萝卜，以免减弱补益之效。
西洋参，苦微甘，寒。味厚气薄，补肺降火，生津液，除烦倦。虚而有火者相宜。
@misc{bencaodian-xi-yang-shen,
author = {{Bencaodian Editorial}},
title = {Xī Yáng Shēn 西洋参 (American Ginseng) — Panacis Quinquefolii Radix},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/xi-yang-shen},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
西洋参主含人参皂苷Rb1、Re、Rg1及拟人参皂苷F11（区别于人参的标志物），具有补气养阴、抗疲劳、免疫调节及降血糖作用。
American ginseng contains ginsenosides Rb1, Re, Rg1 and pseudoginsenoside F11 (distinguishing it from Asian ginseng), with qi-and-yin tonifying, anti-fatigue, immunomodulatory and hypoglycemic effects.
WHO专论收录Radix Panacis Quinquefolii，用于气阴两虚及作为补益剂。
WHO monograph lists Radix Panacis Quinquefolii as a qi-and-yin tonic.
可能影响华法林药效；与降糖药合用应监测血糖。
May alter warfarin effect; monitor blood glucose when combined with hypoglycemic agents.
拟人参皂苷F11为西洋参特征性成分，可用于与人参鉴别。
Pseudoginsenoside F11 is a characteristic marker distinguishing American ginseng from Asian ginseng.
This section is provided for academic reference only and does not constitute medical advice.