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The dried ripe seeds of Pharbitis nil or P. purpurea (Convolvulaceae). Enters the Lung, Kidney, and Large Intestine channels. Purges downward to drain water while also eliminating accumulation and killing parasites. Slightly toxic.
入丸散。炒用，生用毒大。有小毒
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.
（时珍曰）牵牛子泻气分湿热，一切气壅滞者用之，通大小肠。
草部
@misc{bencaodian-qian-niu-zi,
author = {{Bencaodian Editorial}},
title = {Qiān Niú Zǐ 牵牛子 (Morning Glory Seed) — Pharbitidis Semen},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/qian-niu-zi},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
牵牛子含牵牛子苷（树脂苷类）为主要峻泻成分，并含微量麦角类生物碱，具泻下、利尿、驱虫作用。
Qian Niu Zi's principal cathartic is pharbitin (resin glycoside) with trace ergot-type indole alkaloids; produces drastic purgation, diuresis, and anthelmintic effects.
牵牛子苦寒有毒，泻水通便，消痰涤饮，杀虫攻积；孕妇禁用。
Bitter-cold and toxic; drains water, moves stool, transforms phlegm, and kills parasites; contraindicated in pregnancy.
This section is provided for academic reference only and does not constitute medical advice.