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The dried root and rhizome of Asarum heterotropoides var. mandshuricum, A. sieboldii, or A. sieboldii var. seoulense (Aristolochiaceae). Enters the Lung, Kidney, and Heart channels. Pungent and warm, this highly mobile and penetrating herb disperses wind-cold in the head and face, warms the Lung to transform thin mucus, and searches out wind-dampness from sinews and bones.
解表散寒，温肺化饮，通窍止痛
内服入汤剂一般1–3g，研末吞服0.5–1g；古有“细辛不过钱”之说，过量可致呼吸抑制及中毒。
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.
气虚多汗、阴虚阳亢头痛、阴虚肺热咳嗽者忌用。反藜芦（十八反）。内服煎汤一般不过钱（不超过3g），用量过大可致中毒。
细辛含黄樟醚（safrole）和马兜铃酸类成分，过量可引起恶心、呕吐、头痛、呼吸困难甚至呼吸麻痹。现行药典规定根及根茎入药，不用地上部分。孕妇慎用；不可与藜芦配伍。
味辛，温。主咳逆，头痛脑动，百节拘挛，风湿痹痛，死肌。久服明目，利九窍，轻身长年。
上品
@misc{bencaodian-xi-xin,
author = {{Bencaodian Editorial}},
title = {Xì Xīn 细辛 (Asarum) — Asari Radix et Rhizoma},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/xi-xin},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
细辛主含挥发油（甲基丁香酚、黄樟醚等）及木脂素，具有镇痛、解热、局部麻醉及抗炎作用；有潜在毒性。
Asarum herb contains volatile phenylpropanoids (methyl eugenol, safrole) and lignans, with analgesic, antipyretic, local anesthetic and anti-inflammatory effects; potentially toxic.
《中国药典》2005年版起已将细辛法定药用部位由全草改为根及根茎，以降低地上部分马兜铃酸暴露；规定含马兜铃酸I不得超过0.001%。
Since 2005, the Chinese Pharmacopoeia has restricted official Xi Xin to root and rhizome (not whole plant) to reduce aristolochic acid exposure, with a limit of aristolochic acid I not exceeding 0.001%.
黄樟醚具肝毒及潜在致癌性；马兜铃酸有明确肾毒性及致癌性，剂量与时间均应严格控制。
Safrole is hepatotoxic and potentially carcinogenic; aristolochic acid is definitively nephrotoxic and carcinogenic—dose and duration must be strictly controlled.
「细辛不过钱」为传统用量警戒，通常每剂不超过3g。
The adage 'Xi Xin no more than one qian' reflects traditional dose caution, generally not exceeding 3 g per dose.
This section is provided for academic reference only and does not constitute medical advice.