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清热利水，通乳
煎服3–5g；力薄量轻。本品质轻性平和，与古方中之「木通」不同，现代临床常用通草替代木通以避免马兜铃酸肾毒性风险。
本平台仅供学术参考，不构成医疗建议。
通草主含多糖、三萜皂苷及钾盐，药理示轻度利尿作用。与含马兜铃酸的关木通来源及毒性完全不同，不含肾毒性成分，现代临床取代关木通。
Tong Cao contains polysaccharides, triterpenoid saponins and potassium salts with mild diuretic action. It is botanically and toxicologically distinct from Aristolochia-type Guan Mu Tong (which contains nephrotoxic aristolochic acid) and is used today to replace that deprecated herb.
《中国药典》收载通草为五加科植物通脱木的干燥茎髓，已于2005年起撤销关木通入药，强调二者不可混淆。
Chinese Pharmacopoeia lists Tong Cao as the dried stem pith of Tetrapanax papyrifer (Araliaceae). Guan Mu Tong (Aristolochia) was removed from the pharmacopoeia in 2005 — the two must not be confused.
Bensky 指出通草性平和利水而不伤正，为产后通乳及湿温病轻清利水之常用药。
Bensky notes Tong Cao is a mild diuretic that does not damage upright qi — commonly used for postpartum lactation support and light damp-warmth formulas.
WHO 植物药物安全性参考强调必须区分通草（Tetrapanax，安全）与马兜铃科关木通（有肾毒性），处方用名宜明确。
WHO herbal medicine safety references stress the distinction between Tetrapanax-type Tong Cao (safe) and Aristolochia-type Guan Mu Tong (nephrotoxic); prescribers should disambiguate.
本部分信息仅供学术参考，不构成医疗建议。
孕妇及气阴两虚、中寒无湿者忌用。本品与木通（含马兜铃酸的关木通历史使用争议）不同，通草质轻通利，无肾毒性。
【重要说明】通草为五加科植物通脱木 Tetrapanax papyrifer 的干燥茎髓，不含马兜铃酸，与马兜铃科关木通（Aristolochia manshuriensis，含马兜铃酸、有肾毒性）完全不同。古籍「木通」在近代时期存在关木通误用情况，现《中国药典》已撤销关木通入药资格，临床通利剂宜选用通草或木通（Akebia quinata 系）。孕妇禁用。
通草（通脱木），味甘、淡，性寒。气味俱薄，清肺热、利小便，通乳汁。
草部
@misc{bencaodian-tong-cao,
author = {{Bencaodian Editorial}},
title = {Tōng Cǎo 通草 (Tetrapanax Pith) — Tetrapanacis Medulla (Tetrapanax papyrifer)},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/zh/herbs/tong-cao},
urldate = {2026-04-09},
note = {CC BY-SA 4.0}
}