Bai Hua She She Cao
StarHedyotis diffusa Willd.
Traditionally used for
- Nose & throat
- Urinary & fluids
Cautions & contraindications
- Pregnancy
☯ TCM Properties
Clears Heat and Resolves Toxicity; Promotes Urination and Relieves Stranguria; Clears Damp-Heat; Disperses Swelling and Dissipates Abscesses; Invigorates Blood and Alleviates Pain
Traditional Chinese Uses
Bai Hua She She Cao (hedyotis herb, oldenlandia) is a cold, bitter herb widely used in Chinese medicine to clear Heat toxin, reduce swelling, and promote urination. It is one of the most important herbs for inflammatory and infectious conditions, including appendicitis, snake bites, carbuncles, and sore throat. Modern Chinese medicine also uses it extensively in oncology-adjacent protocols for its anti-inflammatory and immune-modulating properties. It is commonly combined with Ban Zhi Lian for synergistic effect in Heat toxin conditions.
Pharmacological Effects
- Effect on reticuloendothelial function: Oral aqueous extract increased leukocyte phagocytosis (threefold in rabbits) and enhanced human leukocyte phagocytosis in vitro; despite negligible in vitro antibacterial activity it treated experimental appendicitis in rabbits, attributed to enhanced nonspecific immunity.
- Effect on adrenocortical function: i.p. herb preparation (0.46 g) reduced thymus weight in mice, suggesting increased adrenocortical function.
- Antispermatogenic: Three weeks oral dosing arrested spermatogenesis in mice; in 77% of 102 adult volunteers given the herb for 3 weeks sperm count fell by 1/3 to 1/10.
Source: Zhu YP. Chinese Materia Medica: Chemistry, Pharmacology and Applications. Harwood Academic, 1998, p. 213.
Relationships
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Botanical Description
Hedyotis diffusa (syn. Oldenlandia diffusa), snake-needle grass, is a slender annual herb of the family Rubiaceae native to moist grasslands, ditches, rice-paddy margins and waste ground throughout southern China, Southeast Asia, Japan and Korea. It produces a slender taproot and many prostrate to ascending, quadrangular, glabrous stems 15-50 cm long that branch repeatedly from the base. The opposite, sessile, linear to narrowly lanceolate leaves are 1-3.5 cm long and only 1-3 mm wide, with revolute margins and a single midvein, subtended by small membranous stipules. Tiny solitary or paired axillary flowers about 2 mm long have a four-toothed calyx and a four-lobed white tubular corolla, followed by small flattened-globose capsules 2-3 mm across crowned by the persistent calyx and containing numerous angular seeds. The whole flowering herb with root is harvested in summer.
Active Constituents
Ursolic acid
Pentacyclic triterpenoidConcentration: Major triterpenoid, reported around 4.6-4.8% by HPLC in some samples
A key bioactive triterpenoid; induces apoptosis, cell-cycle arrest and anti-angiogenic effects in cancer cell models and shows anti-inflammatory activity, underpinning the herb's heat-clearing, toxin-resolving reputation.
Oleanolic acid
Pentacyclic triterpenoidConcentration: Reported around 1.9% by HPLC in some samples
An isomer of ursolic acid with hepatoprotective, anti-inflammatory and cytotoxic activity contributing to the herb's antitumor and detoxifying effects.
Asperuloside / iridoid glycosides
Iridoid glycosideConcentration: Iridoids form one of the largest constituent classes (dozens identified)
Iridoids such as asperuloside, scandoside and E-6-O-p-coumaroyl scandoside methyl ester contribute anti-inflammatory and antitumor activity.
2-Hydroxy-3-methylanthraquinone
AnthraquinoneConcentration: Representative of the anthraquinone fraction
Anthraquinones from the herb show pro-apoptotic and antiproliferative activity against tumor cell lines in vitro.
Flavonoids (quercetin and kaempferol glycosides)
FlavonoidConcentration: Numerous flavonoids identified across the aerial parts
Flavonoid glycosides provide antioxidant, anti-inflammatory and immunomodulatory activity.
Polysaccharides
PolysaccharideConcentration: Water-soluble fraction of the whole herb
Reported to stimulate immune cells and contribute to the immunomodulatory component of the herb's antitumor activity.
⚠ Drug Interactions
Hedyotis corymbosa (Shui Xian Cao) and Hedyotis tenelliflora sold as Bai Hua She She Cao
Hedyotis corymbosa and Hedyotis tenelliflora are documented market adulterants that are very hard to tell from Hedyotis diffusa morphologically once dried, and Hedyotis brachypoda is also reported. Chloroplast genome sequencing and DNA barcoding have been developed specifically to separate them, and a species-specific iridoid marker was proposed because the older chemical markers are shared. Since almost all of the published pharmacology names Hedyotis diffusa, material that is actually a congener has no evidence base at all.
Clinical note: Buy from suppliers who can document species identity. This is the single most important quality issue with this herb; it is far better characterised than any pharmacological interaction.
Cytotoxic chemotherapy and targeted anticancer agents
Hedyotis diffusa injection and decoctions are used adjunctively with chemotherapy in China, and the herb's constituents modulate apoptosis, angiogenesis and immune signalling in cell and animal models. But no controlled human study has measured whether the herb changes the exposure or the toxicity of any chemotherapeutic agent, and the reviews that describe the anticancer mechanisms are reviews of preclinical work. Treat any claim of a specific interaction, helpful or harmful, as unsupported.
Clinical note: Disclose use to the treating oncologist and do not present the herb as an evidence-based adjunct. Where a patient is in a trial or on a narrow-therapeutic-index agent, leave it out.
Pregnancy (not a drug interaction, but the standard caution for this herb)
Standard clinical references advise caution in pregnancy for this herb, which is used in large doses (15-60 g, and higher in oncology practice). There is no human reproductive safety data and the routine cancer-adjunct dosing is far above the doses characterised in the available toxicology.
Clinical note: Avoid in pregnancy. Note also that the only long-term toxicology available is for a three-herb hospital preparation rather than for Hedyotis diffusa alone.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 15–60 g | Daily | — | — | Standard oral dose per Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 53–72. Exact wording: Normally, 15–60 g is decocted with water as an oral |
Preparation Methods
Decoction of the whole herb
Parts: whole aerial plant, root
The dried whole plant is decocted (commonly 15-60 g, larger doses used in some clinical settings) to clear heat, resolve toxicity and drain damp-heat; frequently combined with other heat-clearing herbs.
Fresh herb juice / topical application
Parts: fresh whole plant
The fresh plant may be crushed for juice taken internally, or the pounded fresh herb applied topically to swellings, sores and snakebite in folk practice.
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Together they strengthen the clearing of heat toxin, resolving of damp and dispersing of toxic swellings beyond either alone.
Frequently used together in modern practice for toxic swellings and as adjunctive treatment in oncology.
Named pairing — Chen and Chen, Chinese Medical Herbology and Pharmacology (2004)
Evidence Tier
Strong evidence · 1 studyRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
1
1 verified · 0 unverified
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
0
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Antitumor potential of Hedyotis diffusa Willd: A systematic review of bioactive constituents and underlying molecular mechanisms
This systematic review catalogues the antitumor constituents of Hedyotis diffusa (triterpenoids, flavonoids, iridoids and anthraquinones) and summarises multi-target, multi-pathway mechanisms including inhibition of proliferation and angiogenesis and promotion of apoptosis across several tumor types. Evidence is predominantly in vitro and animal-based.
⚠ Safety & Contraindications
- Pregnancy
Contraindications
Its use is prohibited in patients with dorsal furuncle and deficiency-cold of the spleen and stomach.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 53–72.
Historical Texts
Guangxi Zhongyaozhi (Guangxi Records of Chinese Medicinals) and other 20th-century provincial materia medica
Modern (20th century)Quanguo Zhongcaoyao Huibian (National Compendium of Chinese Herbal Medicine)
Modern (1975-1978)References
- Han X, Zhang X, Wang Q, Wang L, Yu S. Antitumor potential of Hedyotis diffusa Willd: A systematic review of bioactive constituents and underlying molecular mechanisms . Biomedicine & Pharmacotherapy (2020) [DOI]
- Chen R, He J, Tong X, Tang L, Liu M. The Hedyotis diffusa Willd. (Rubiaceae): A Review on Phytochemistry, Pharmacology, Quality Control and Pharmacokinetics . Molecules (2016) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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