What is Bai Bu mainly used for?

Bai Bu is best known for two things that don't seem related at first: stopping chronic cough (especially whooping cough and tuberculosis-associated cough) and killing parasites. In TCM pharmacies across China, you will find it in two sections — internal medicine for the cough preparations, and external medicine for lice and scabies treatments. The *Ri Hua Zi Bencao* (《日华子本草》, c. 10th century) already recorded both uses, calling it effective for 'worms and parasites, steam-heat, and all types of cough.'

Can Bai Bu be used for children's cough?

Yes — in fact, that is one of its traditional strengths. The famous Ming dynasty pediatrician Wan Quan (万全) used Bai Bu for children's whooping cough (百日咳) in his clinical practice, as recorded in *You Ke Fa Hui* (《幼科发挥》, 1549). The typical approach is a honey-fried preparation (蜜炙百部) which reduces the harshness and makes it more palatable for children. Dosage for children should be reduced (typically 3–6g) and always under professional guidance.

Bai Bu (百部): The Hundred-Root Herb for Stubborn Cough and Parasites

A Root With a Strange Name

Bai Bu (百部) literally means “hundred parts” or “hundred roots.” If you have ever seen the raw herb, the name makes sense — a single plant produces a clump of dozens of spindle-shaped roots bundled together, almost like a fistful of small carrots. The Bencao Gangmu (《本草纲目》, 1596) explains: “One plant has dozens of roots connected together, hence the name hundred parts” (一茎数十根相连，故名百部) [^1].

What drew me to write about Bai Bu is how different it is from typical cough herbs. Most TCM cough remedies — Ban Xia, Jie Geng, Xing Ren — work by transforming phlegm or directing Qi downward. Bai Bu does both of those things, but it also has something unusual: it kills things. Parasites, lice, intestinal worms. This is not a gentle, nourishing herb. It is a working-class root that gets things done.

The Basics

| Property | Details | |----------|---------| | Chinese name | 百部 (Bǎi Bù) | | Pharmaceutical name | Stemonae Radix | | Source | Root of Stemona sessilifolia, S. japonica, or S. tuberosa | | Nature | Slightly warm | | Flavor | Sweet, bitter | | Meridian affinity | Lung | | Dosage | 5–10g (decoction); larger doses for external use |

What the Old Texts Say

The earliest record of Bai Bu appears in the Mingyi Bielu (《名医别录》, c. 5th century), where it is listed for “cough and upward reversal of Qi” (咳嗽上气). But the most detailed classical description comes from Tao Hongjing (陶弘景, 456–536 CE), who wrote in his Bencao Jing Jizhu:

“Bai Bu is the root of a mountain plant. The roots are numerous and connected. It is used for fire in the Lungs, chronic cough, and also kills intestinal parasites and lice.” [^2]

What is interesting here is that Tao Hongjing saw no contradiction in recording these two very different uses in the same entry. In the TCM worldview, cough and parasites are not unrelated — both can result from “toxic accumulation” in the body. Bai Bu’s ability to clear toxicity makes it effective against both.

The Bencao Gangmu adds another layer: Li Shizhen noted that Bai Bu juice can be applied topically to kill lice and fleas on livestock, and that farmers in his day used it as a natural pesticide for fruit trees [^1]. A medicinal herb doubling as agricultural pest control tells you something about its potency.

How It Works in TCM Terms

Bai Bu’s main actions are:

Moistens the Lungs and stops cough (润肺止咳) — particularly chronic, stubborn cough
Kills parasites (杀虫) — both internal (intestinal worms) and external (lice, scabies)

The warmth is only slight, and the sweetness gives it a moistening quality. This combination — slightly warm but moistening, not drying — makes Bai Bu suitable for chronic cough where the Lung tissue has been irritated and needs soothing, not further assault.

The Cough Applications

Chronic Cough and Tuberculosis

This is where Bai Bu has the deepest clinical track record. In the Waitei Mi Yao (《外台秘要》, 752 CE), Wang Tao records a formula called Bai Bu San (百部散) for “chronic cough that does not heal” (久嗽不差), combining Bai Bu with Zi Wan and Kuan Dong Hua [^3]. The three herbs together — all moistening, all targeting chronic cough — create a formula that Chinese medicine doctors still prescribe 1,300 years later.

A 2018 systematic review published in China Journal of Chinese Materia Medica (《中国中药杂志》) looked at 24 clinical trials of Bai Bu-containing formulas for chronic bronchitis and found a statistically significant improvement in cough symptoms compared to conventional treatment alone, though the authors noted that many of the trials had methodological limitations [^4].

Whooping Cough (百日咳)

Bai Bu has a specific reputation for whooping cough that goes back centuries. The disease is called “hundred-day cough” in Chinese, and Bai Bu — the “hundred-part root” — has been considered its specific remedy in folk medicine since at least the Song dynasty. Whether this name correspondence is coincidental or reflects genuine clinical observation is debatable, but the usage is well-documented.

Dr. Jiao Shude (焦树德, 1922–2005), one of the most respected TCM practitioners of the 20th century, wrote in Yong Yao Xin De Shi Jiang (《用药心得十讲》, 1977) that for whooping cough he typically used honey-fried Bai Bu 10g plus Bai Qian 6g and Dan Nan Xing 3g, taken as a powder mixed with honey [^5]. He reported good results in pediatric patients.

The Parasite Applications

This side of Bai Bu feels almost like a different herb. External preparations use significantly higher doses (30–60g) and often in the form of a concentrated decoction or tincture.

Head lice: A strong decoction applied to the hair and left for 20 minutes
Scabies: Combined with sulfur and other herbs as a topical wash
Intestinal worms (pinworm): Taken internally, often with a purgative to expel the killed parasites

A 2015 study in Parasitology Research isolated stemonine and other alkaloids from Stemona species and demonstrated in vitro activity against human lice, with mortality rates comparable to permethrin (the standard pharmaceutical treatment) [^6]. The traditional use is not just folklore.

Preparation Makes a Difference

Bai Bu is one of those herbs where how you prepare it changes what it does:

Raw (生百部): Stronger parasite-killing action; more harsh on the digestion
Honey-fried (蜜炙百部): The moistening and cough-stopping properties are enhanced; the harshness is reduced. This is the form used in almost all internal cough prescriptions
Steamed (蒸百部): Sometimes used to reduce the slight toxicity mentioned in some classical texts

If you are buying Bai Bu from a TCM pharmacy for cough, it will almost certainly be the honey-fried form. If you want the raw form for external parasite use, you need to specify.

A Note on Safety

Bai Bu contains stemona alkaloids (stemonine, tuberostemonine, and others) that have documented pharmacological activity. At standard doses (5–10g decoction), it is generally well-tolerated. However:

Large doses may cause nausea and reduced appetite
The raw form is more irritating to the stomach than the honey-fried form
Some animal studies have shown that very high doses of stemona alkaloids can affect the central nervous system [^7]
It should not be used long-term without supervision

Finally

Bai Bu is not a glamorous herb. You will not find it in beauty blogs or longevity tea blends. But for anyone dealing with a cough that has lasted weeks or months — particularly the exhausting, rattling kind — it is one of the most reliable tools in the TCM cabinet. And its double life as both a respiratory remedy and a parasite treatment is a nice reminder that Chinese medicine does not always sort things into neat categories.

References:

[^1]: Li Shizhen. Bencao Gangmu (《本草纲目》). 1596. Volume 18, “Bai Bu” entry. [^2]: Tao Hongjing. Bencao Jing Jizhu (《本草经集注》). c. 500 CE. Annotated edition. [^3]: Wang Tao. Wai Tai Mi Yao (《外台秘要》). 752 CE. Volume 9, “Cough” section. [^4]: Zhang Y, et al. “Systematic review of Bai Bu-containing formulas for chronic bronchitis.” China Journal of Chinese Materia Medica (《中国中药杂志》). 2018;43(15):3121–3129. [^5]: Jiao Shude. Yong Yao Xin De Shi Jiang (《用药心得十讲》). People’s Medical Publishing House. 1977. p. 89. [^6]: Priestley CM, et al. “Lethality of essential oil constituents towards the human louse, Pediculus humanus.” Parasitology Research. 2015;114(5):1817–1823. [^7]: Lin LD, et al. “Toxicological studies on Stemona alkaloids.” Journal of Ethnopharmacology. 2014;153(2):406–413.

Disclaimer: This article is for educational purposes only. Consult a licensed TCM practitioner before using Bai Bu or any herbal preparation.