Han Fang Ji (Stephania Root)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Han Fang Ji?

  Reference materia medica place Han Fang Ji at roughly 4.5–9 grams per day in decoction, which is the range the Sacred Lotus records from both of its cited authorities. That is a moderate, conventional herb dose — Han Fang Ji is not a restricted or minute-dose substance in the way the toxic medicinals are.

  • Consistency across sources — the two standard English-language materia medica cited in our record give the same 4.5–9 g figure, an unusually clean agreement.
  • Context matters more than the number — the substantive dosing question for this herb is not quantity but identity: the safety of the dose depends entirely on the material actually being Stephania tetrandra and not a substituted Aristolochia species. See the identity and safety sections below.
  • Professional supervision — as with all Chinese herbal medicine, herbs are prescribed within a formula by a qualified practitioner, not taken singly on the basis of a reference range.

  Source: Sacred Lotus recorded dosage (4.5–9 g in decoction, two cited references in agreement); materia medica consensus (Bensky; Chen & Chen). Reference range for practitioners and students, not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions or contraindications for Han Fang Ji?

  Han Fang Ji itself is a conventional, non-restricted herb, but its cold, bitter, strongly draining character makes it inappropriate in deficiency patterns — and the overriding practical caution is sourcing. The Sacred Lotus record advises caution in yin deficiency and in Spleen and Stomach deficiency or cold, since a cold draining herb further depletes fluids and weakens digestive fire.

  • Yin deficiency — use with caution; the herb drains fluids downward, which works against an already fluid-depleted picture.
  • Spleen/Stomach deficiency or cold — use with caution; the cold nature can further impair digestion in an already cold, weak middle burner.
  • Sourcing and identification — the critical caution. Genuine Han Fang Ji does not contain aristolochic acid, but material sold under the bare name “Fang Ji” has historically been substituted with Aristolochia fangchi. Practitioners and suppliers should require botanical identification of the species, not merely the trade name.
  • Pregnancy — no absolute pregnancy contraindication is recorded for this herb in the Sacred Lotus; as with any strongly draining herb, use in pregnancy is a matter for professional judgement.

  Regulatory note (United Kingdom). The Medicines (Aristolochia and Mu Tong etc.) (Prohibition) Order 2001, SI 2001/1841, in force from 1 July 2001, prohibits the sale, supply and importation of medicinal products consisting of or containing any plant of the genus Aristolochia — and, in the same article, a named list of substitute plants that includes Stephania tetrandra, the species on this page, alongside Akebia quinata, Akebia trifoliata, Clematis armandii, Clematis montana and three Cocculus species. A further article prohibits any product whose label or accompanying document indicates that it consists of or contains “Mu Tong” or “Fangji”, or any term derived from those. The Order is deliberately name-based and precautionary: it catches the aristolochic-acid-free plants as well, precisely because the shared trade names could not be relied on to identify what was in the bag. Han Fang Ji falls inside it despite containing no aristolochic acid — the restriction addresses the substitution risk described above, not a hazard in Stephania tetrandra itself. Readers in the UK should be aware of the position; readers elsewhere should note that we do not assert any United States or European Union status here, as we were unable to verify those at primary-source level.

  Source: Sacred Lotus cautions record (yin deficiency; Spleen/Stomach deficiency or cold); UK prohibition per The Medicines (Aristolochia and Mu Tong etc.) (Prohibition) Order 2001, SI 2001 No. 1841, articles 2 and 3, read directly at legislation.gov.uk; PMID 32163850 (documented substitution/adulteration risk); PMID 18418355, DOI 10.1038/ki.2008.129 (substitution as a recurring global cause of aristolochic acid nephropathy). Reference information only — not medical advice.

Chinese Herb Toxicity & Overdose

• Is Han Fang Ji toxic? Does it cause kidney damage?

  Genuine Han Fang Ji does not contain aristolochic acid and is not the cause of “Chinese herb nephropathy.” That disease was caused by Aristolochia fangchi being substituted for Stephania tetrandra. The distinction matters enormously, because Han Fang Ji is widely and wrongly blamed for it.

  • What actually happened — in Belgium between 1990 and 1992, a slimming preparation dispensed to weight-loss clinic patients contained, through a manufacturing/sourcing error, Aristolochia fangchi in place of Stephania tetrandra. More than a hundred patients developed progressive renal interstitial fibrosis. Among 39 patients with end-stage disease who underwent prophylactic removal of the native kidneys and ureters, 18 (46%) were found to have urothelial carcinoma, and every tissue sample analysed contained aristolochic-acid–derived DNA adducts; cumulative aristolochia dose was a significant risk factor.
  • Not a one-off — aristolochic acid nephropathy has since been documented worldwide, and substitution within complex pharmacopoeias is identified in the nephrology literature as a recurring mechanism of exposure. Aristolochic acid is also implicated in Balkan endemic nephropathy through contaminated grain.
  • Carcinogen status — the International Agency for Research on Cancer classifies aristolochic acid and plants containing it as carcinogenic to humans (Group 1). Aristolochic acid leaves a distinctive mutational signature that has since been detected in kidney cancer genomes across multiple countries in large-scale sequencing work.
  • Han Fang Ji’s own toxicity profile — the Sacred Lotus record notes that overdose can produce vomiting, tremor, ataxia, convulsions, quadriplegia, hypertonicity and respiratory failure. Separately, laboratory research on tetrandrine, the herb’s principal alkaloid, has examined dose-dependent liver injury in animal models and mechanisms for mitigating it — relevant context at high or prolonged exposure, and preclinical rather than clinical.

  In short: the danger associated with the name “Fang Ji” is a danger of misidentification and substitution in the supply chain. It is not a property of Stephania tetrandra.

  Source: PMID 10841870, DOI 10.1056/NEJM200006083422301 (Nortier et al., urothelial carcinoma associated with Aristolochia fangchi; the Belgian cohort); PMID 18418355, DOI 10.1038/ki.2008.129 (aristolochic acid nephropathy as a worldwide problem; substitution mechanism); PMID 11423353 (aristolochic-acid DNA adducts in Chinese herb nephropathy patients); PMID 30548302, DOI 10.1111/jcpt.12789 (review of aristolochic acid toxicity recognition); PMID 38693263, DOI 10.1038/s41586-024-07368-2 (aristolochic acid mutational signature in kidney cancer genomes, Nature 2024); IARC Monographs vol. 100A (aristolochic acid, Group 1); PMID 32163850 (absence of aristolochic acid in authenticated Stephania tetrandra); PMID 35820303, DOI 10.1016/j.phymed.2022.154325 (tetrandrine hepatotoxicity mechanism, preclinical); Sacred Lotus toxicity record (overdose signs). Toxicology reference, not medical advice.

Herb-Drug Interactions

• Does Han Fang Ji interact with medications?

  No well-established clinical herb–drug interaction table exists for Han Fang Ji, but two precautionary areas are worth knowing. The Sacred Lotus record advises caution alongside diuretic medications — including thiazides such as chlorothiazide and hydrochlorothiazide, and loop diuretics such as furosemide, bumetanide and torsemide — on the straightforward reasoning that a herb whose primary action is to promote urination may compound a diuretic effect.

  • Diuretics — theoretical additive effect on fluid and electrolyte loss. Precautionary, not a demonstrated clinical interaction.
  • Transporter-level activity (preclinical) — tetrandrine and fangchinoline, the herb’s main alkaloids, have been shown in laboratory studies to inhibit P-glycoprotein and thereby reverse multidrug resistance in cancer cell lines. P-glycoprotein handles the disposition of many conventional drugs, so this is a mechanistically plausible interaction route. It has not been established as a clinical interaction: a mouse study reported that tetrandrine reached plasma concentrations capable of reversing multidrug resistance in vitro yet had no apparent effect on doxorubicin pharmacokinetics in vivo.
  • What is not claimed — we are aware of no controlled human interaction studies for this herb, and none are asserted here. (Flagged for practitioner confirmation.)

  Source: Sacred Lotus drug-interaction record (diuretic caution); PMID 24856768, DOI 10.1016/j.phymed.2014.04.029 (tetrandrine and fangchinoline reverse multidrug resistance via P-glycoprotein inhibition, in vitro); PMID 17273824, DOI 10.1007/s00280-007-0420-0 (tetrandrine plasma concentrations vs. doxorubicin pharmacokinetics in mice). Precautionary reference, not a medical claim.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Han Fang Ji (Stephania tetrandra)?

  Yes — a large and unusually well-defined literature, almost all of it centred on tetrandrine, the herb’s dominant bisbenzylisoquinoline alkaloid, together with its close structural relative fangchinoline. The two molecules are identical except for a single methoxy-versus-hydroxyl substitution at C7, and both are calcium-channel-active compounds with broad reported bioactivity.

  • Chemistry — comprehensive mass-spectrometric profiling has annotated several hundred isoquinoline alkaloids across roughly twenty structural classes in Stephania tetrandra, with tetrandrine and fangchinoline the two recognised markers. The same study demonstrated direct authentication of crude slices and confirmed no aristolochic-acid signals.
  • Anti-inflammatory and pulmonary work — tetrandrine has a long-standing research literature in inflammatory lung disease, and is used in China for pneumoconiosis/silicosis. A retrospective cohort study of artificial-stone-associated silicosis and a controlled study combining tetrandrine tablets with acetylcysteine both report changes in pulmonary function and exercise tolerance measures. These are limited, mostly non-randomised clinical datasets from a single national context, and should be read as such rather than as established efficacy.
  • Oncology (preclinical) — tetrandrine and fangchinoline are widely studied against cancer cell lines, with reported apoptosis induction, G1 cell-cycle arrest and inhibition of migration and invasion, plus the P-glycoprotein-mediated multidrug-resistance reversal noted above. This is cell and animal work, not clinical evidence.
  • Toxicology — tetrandrine-associated liver injury has been characterised mechanistically in animal models, giving a preclinical basis for caution at high or prolonged exposure.

  The clinically strongest and most consequential body of evidence connected to the name “Fang Ji” concerns not this herb but its historical substitute — the aristolochic acid nephropathy literature summarised in the toxicity section above.

  Sources: PMID 32163850, DOI 10.1016/j.jpba.2020.113225 (isoquinoline profiling and authentication); PMID 33583757, DOI 10.1016/j.joim.2021.01.001 (tetrandrine and fangchinoline chemistry, pharmacology and anticancer properties); PMID 26899361, DOI 10.1016/j.phytochem.2016.02.005 (tetrandrine, a molecule of wide bioactivity); PMID 12466048 (pharmacological actions of tetrandrine in inflammatory pulmonary diseases); PMID 36873890, DOI 10.3389/fmed.2023.1107967 (tetrandrine in artificial-stone-associated silicosis, retrospective cohort); PMID 32765668, DOI 10.3892/etm.2020.8858 (acetylcysteine plus tetrandrine in silicosis); PMID 24856768 (P-glycoprotein/multidrug resistance, in vitro); PMID 35820303, DOI 10.1016/j.phymed.2022.154325 (tetrandrine hepatotoxicity, preclinical). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is the difference between Han Fang Ji and Guang Fang Ji?

  This is the single most important thing to know about this herb. “Fang Ji” is a shared trade name covering two botanically unrelated roots: Han Fang Ji (also called Fen Fang Ji), the root of Stephania tetrandra S. Moore, family Menispermaceae — and Guang Fang Ji, the root of Aristolochia fangchi, family Aristolochiaceae, which contains aristolochic acid. Han Fang Ji is the safe one. Guang Fang Ji is not. Confusing them caused one of the most serious herbal-safety disasters on record.

  • Han Fang Ji (Stephania tetrandra) — the Sacred Lotus record for this herb. Its characteristic constituents are the bisbenzylisoquinoline alkaloids tetrandrine and fangchinoline. Analytical authentication work profiling Stephania tetrandra by high-resolution mass spectrometry explicitly confirmed the absence of aristolochic-acid-related mass signals in genuine material. Han Fang Ji does not contain aristolochic acid.
  • Guang Fang Ji (Aristolochia fangchi) — held in the Sacred Lotus as a separate record, marked toxic and noted as banned, and carrying no formula links in our data. It contains aristolochic acid, a nephrotoxin and human carcinogen.
  • Why the confusion happens — the two roots have similar names and genuinely similar sliced appearance, and the same analytical literature notes that Stephania tetrandra “is often mistakenly substituted and adulterated with the nephrotoxic Aristolochia fangchi.” The risk is therefore a supply-chain and identification risk, not a property of Han Fang Ji itself.
  • Formula attribution in our own data — Xuan Bi Tang and Xiao Xu Ming Tang are recorded against Han Fang Ji in the Sacred Lotus, which is the correct and safe attribution for these classical formulas; Guang Fang Ji carries no formula links at all. Fang Ji Huang Qi Tang likewise resolves to Han Fang Ji.
  • Practical takeaway — when a source, supplier or label says only “Fang Ji,” the name alone is not sufficient. Botanical identification of the material is what establishes safety.

  Note on the identity fields: the Sacred Lotus records the Chinese characters for this entry as 防己 (“Fang Ji”) rather than the disambiguating 汉防己 / 粉防己 (Han Fang Ji / Fen Fang Ji) used in the Chinese Pharmacopoeia and the analytical literature, while the Guang Fang Ji record correctly carries 广防己. The Latin name recorded here (Radix Stephaniae Tetrandrae) is unambiguous and correct. We flag the bare 防己 for owner review rather than altering an identity field, since on a page whose whole subject is name confusion the ambiguous form is worth resolving.

  Source: Sacred Lotus herb records for both Han Fang Ji and Guang Fang Ji, and their formula links; PMID 32163850, DOI 10.1016/j.jpba.2020.113225 (comprehensive profiling and direct authentication of Stephania tetrandra; absence of aristolochic-acid signals; documented substitution risk); PMID 10841870, DOI 10.1056/NEJM200006083422301 (the substitution event). Reference information; not medical advice.