Ze Xie (Water Plantain Rhizome, Alisma)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Ze Xie?

  Roughly 5–10 g in decoction, up to about 30 g in severe damp-excess cases — a narrower range of about 4.5–9 g also appears in some materia medica sources for milder presentations. As with other water-draining herbs, the dose is generally adjusted to the severity of the damp/edema pattern being addressed.

  Source: Sacred Lotus legacy content, consistent with standard Bensky/Chen & Chen materia medica dosage ranges. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Ze Xie?

  Use caution in cases with Sunken Qi of the Middle Jiao — because Ze Xie drains downward and promotes urination, it is traditionally avoided (or used carefully) where Spleen qi is already sinking or prolapsing, since its draining action can aggravate that pattern.

  Source: Sacred Lotus legacy content, consistent with standard materia medica cautions for water-draining herbs.

Chinese Herb Toxicity & Overdose

• Low at standard doses; overdose or extended use can cause hematuria, electrolyte imbalance, nausea, vomiting, diarrhea, and abdominal pain. A 2017 review in the Annals of the New York Academy of Sciences covering the phytochemistry, pharmacology, and toxicology of Rhizoma Alismatis concluded that its extracts are “relatively safe” with no serious side effects reported within typical dose ranges.

  Note: A 2022 computational (network-toxicology/molecular-docking) study flagged theoretical hepato-nephrotoxicity risk from specific minor constituents (e.g. emodin) at the target-prediction level. This is an in-silico hypothesis, not clinical or experimental toxicity evidence, and the same authors state it requires in vivo/in vitro confirmation — it is noted here for completeness, not as an established risk.

  Source: Sacred Lotus legacy content; PMID 28662316 (safety review); PMID 36457705 (in-silico toxicity prediction, preliminary). Reference note, not a safety guarantee.

Herb-Drug Interactions

• Ze Xie promotes urination and may have an additive effect with diuretic medications (e.g. furosemide/Lasix), with a theoretical increased risk of excess fluid or electrolyte loss when combined. No controlled human interaction studies were located; this is a precautionary, mechanism-based note rather than a demonstrated clinical interaction.

  Source: Sacred Lotus legacy content (mechanism-based caution).

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 Ze Xie (Alisma orientale / Alisma plantago-aquatica)?

  Yes — a substantial body of preclinical (animal, cell, and computational) research supports Ze Xie’s traditional diuretic, lipid-lowering, and cardiovascular actions, though controlled human clinical trials remain limited. The dried rhizome (Rhizoma Alismatis) comes from Alisma orientale (syn. A. plantago-aquatica), and its protostane-type triterpenoids (the “alisols”) are the most studied bioactive constituents.

  • Diuretic mechanism — a 2020 study (RSC Advances) found that a defined ratio of three alisol-type triterpenoids drives Ze Xie’s diuretic effect in rats, increasing urine volume and electrolyte excretion while reducing aquaporin-2 expression in kidney tissue; supported by earlier work showing inhibition of kidney (Na⁺+K⁺)-ATPase. Animal/enzyme studies.
  • Lipid-lowering / cardiometabolic effects — a 2022 network-pharmacology and metabolomics study (Food & Function) in high-fat-diet mice identified PPAR-pathway targets underlying Ze Xie’s hypolipidemic action; a 2023 review (American Journal of Chinese Medicine) summarizes evidence that alisol-type constituents modulate macrophage lipid metabolism and vascular smooth muscle behavior relevant to cardiovascular disease and obesity. Preclinical/mechanistic, not human trial evidence.
  • Antitumor triterpenoids (in vitro) — alisol B acetate triggered apoptosis in human prostate cancer (PC-3) cells (Cancer Letters, 2006), and related triterpenoids isolated from Alismatis Rhizoma showed cytotoxicity against several cancer cell lines (Archives of Pharmaceutical Research, 2001). Laboratory cell-culture studies, not evidence of a cancer treatment.
  • Comprehensive review — a 2017 review (Annals of the New York Academy of Sciences) surveying ethnomedicinal use, phytochemistry, and pharmacology reports diuretic, antimetabolic-disorder, hepatoprotective, immunomodulatory, anti-inflammatory, antitumor, antibacterial, and antiviral activities across the literature, alongside a favorable safety profile at typical doses.

  Overall, mechanistic and animal evidence for the diuretic and lipid-lowering actions is substantial; well-controlled human clinical trials specific to Ze Xie are still limited.

  Sources: PMID 28662316 (comprehensive review); PMID 35383784 (Food & Function, hypolipidemic mechanism); PMID 36961296 (American Journal of Chinese Medicine review); PMID 16399228 (Cancer Letters); PMID 11794528 (Archives of Pharmaceutical Research); PMID 1647455 (Yakugaku Zasshi, kidney ATPase); PMID 3657386 (Life Sciences, alismol/calcium channel); PMID 36457705 (Frontiers in Pharmacology, in-silico toxicity, preliminary). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Ze Xie different from Fu Ling and Zhu Ling, and what does it combine with?

  Ze Xie, Fu Ling, and Zhu Ling all promote urination and drain dampness, but Ze Xie is the coldest of the three and uniquely also drains Kidney deficiency fire — Fu Ling additionally tonifies the Spleen and calms the shen (it does not purely drain), while Zhu Ling is the most purely draining of the group with no tonifying action. Ze Xie’s sweet-bland-cold nature is described as excellent for draining damp specifically because it is cold enough to offset heat that would otherwise build up when it is combined with warm tonifying herbs.

  • Liu Wei Di Huang Wan — Ze Xie is one of the formula’s “three drains” (with Fu Ling and Mu Dan Pi), balancing the “three tonics” (Shu Di Huang, Shan Zhu Yu, Shan Yao) so the tonifying herbs do not become cloying or stagnating.
  • Jin Gui Shen Qi Wan — the same three-drain/three-tonic structure, here paired with the warming Fu Zi and Gui Zhi; Ze Xie’s cold, bland nature is traditionally understood to keep the warm Kidney-yang tonics from generating excess heat.
  • Wu Ling San — combined with Fu Ling, Zhu Ling, Bai Zhu, and Gui Zhi as a core water-metabolism formula for edema and difficult urination with Spleen involvement.
  • Zhu Ling Tang — combined with Zhu Ling, Fu Ling, Hua Shi, and E Jiao to drain damp-heat while still nourishing yin, for urinary difficulty with concurrent yin deficiency.
  • Also appears in Long Dan Xie Gan Tang, Dang Gui Shao Yao San, Gui Ling Gan Lu Yin, Ji Chuan Jian, and Zhong Man Fen Xiao Wan. (Traditional formula context, not treatment advice.)

  Source: Sacred Lotus ingredient links (verified herb–formula pairings and gram amounts); standard TCM comparison of the damp-draining herbs (Bensky/Chen & Chen).