Gua Di (Melon Pedicle)

Chinese Herb Actions

Chinese Herb Dosage

• What is the dosage ceiling for Gua Di?

  Materia medica sources record one of the smallest dose ranges of any commonly cited herb: roughly 0.3–1 g as a powder or pill, or up to about 1.5–6 g in decoction — reflecting its status as a potent, toxic emetic where the effective and harmful doses sit close together. This is reference information from the historical/materia medica literature, not a prescription; Gua Di is not a self-administered herb.

  • Powder/pill form — roughly 0.3–1 g cited across sources; this is the traditional form used to trigger emesis.
  • Decoction form — sources vary, citing ranges from about 1.5–6 g; decoction is used far less often than the powder form for this herb.
  • Formula-specific example — the classical formula Gua Di San records roughly 1–3 g of dry-fried Gua Di powder as its lead ingredient.

  Note: cited decoction ranges vary somewhat by source (e.g., 1.5–6 g vs. 2.5–5 g); this looks like ordinary materia medica rounding rather than a substantive disagreement, so the range is reported rather than a single figure.

  Source: cross-referenced materia medica dosage figures for Gua Di / Pedicellus Melo; the Gua Di San formula record. Reference only — not a prescription; this is a toxic herb used only under qualified professional supervision.

Chinese Herb Contraindications & Cautions

• Are there cautions or contraindications for Gua Di?

  Yes — Gua Di is contraindicated in pregnancy and the postpartum period, in weak/deficient or elderly patients, and in anyone with a bleeding disorder or history of gastrointestinal or other hemorrhage. As a forced-vomiting herb it is reserved in traditional practice for excess-pattern presentations in patients robust enough to tolerate the emetic action; it is not given to patients whose constitution or condition could be worsened by it.

  • Pregnancy & postpartum — contraindicated; the strain of forced vomiting is considered unsafe in pregnancy and unsuitable during postpartum recovery.
  • Weak, deficient, or elderly patients — contraindicated; traditional sources restrict emetic herbs to patients with sufficient underlying strength to withstand the reaction.
  • Bleeding disorders / hemorrhage history — contraindicated where there is hematemesis, hemoptysis, gastrointestinal bleeding, or another bleeding tendency, since forced vomiting can provoke or worsen bleeding.
  • Professional supervision — consistently described across sources as an herb for trained-practitioner use only, not a general-use or self-administered substance.

  Source: cross-referenced materia medica cautions for Gua Di / Pedicellus Melo; the Gua Di San formula record (contraindications for pregnancy, postpartum, elderly, and constitutionally weak patients). Neutral reference disclosure, not usage guidance.

Chinese Herb Toxicity & Overdose

• Gua Di is a genuinely toxic herb; the current record classifies it as slightly toxic, though other materia medica sources classify it simply as toxic — sources agree on the underlying caution even where the toxicity label differs. Its emetic and irritant action is attributed to cucurbitacins, intensely bitter triterpenoid compounds concentrated in the pedicel, which are directly irritating to the gastrointestinal tract and can produce systemic toxicity in excess. Overdose is reported to develop rapidly — within roughly 30 minutes of ingestion — with abdominal pain, persistent vomiting, severe diarrhea, restlessness, thirst, and hypotension, illustrating how narrow the margin is between an emetic dose and a harmful one. This is the basis for the very small dose ceiling and the professional-supervision requirement described above.

  Note: the current record lists Gua Di’s toxicity as “Slightly Toxic,” while a number of materia medica sources classify it simply as “Toxic.” Both labels agree the herb requires small dosing and professional supervision; the difference reads as a labeling/grading variation rather than a substantive disagreement about safety, so it is flagged here rather than resolved.

  Source: cross-referenced materia medica toxicity descriptions for Gua Di; cucurbitacin pharmacology/toxicity review, PMID 36460279 (Pharmacology Research, 2023). Reference note, not a safety guarantee — this herb is for professional use only.

• This herb is considered slightly toxic.
  (while some Chinese herbs are toxic, it must be noted that many come prepared, or are combined, to mitigate their toxicity)

Herb-Drug Interactions

• No well-established clinical herb–drug interaction studies exist for Gua Di specifically. Given that its active cucurbitacin constituents have documented hepatic and cytotoxic pharmacology in laboratory research (below), and that its traditional use itself induces vomiting and gastrointestinal distress, practitioner awareness is reasonable when a patient is taking anticoagulants, antiplatelet medication, or hepatotoxic drugs — this is precautionary reasoning based on the herb’s pharmacology and traditional bleeding-risk cautions, not a demonstrated clinical interaction. (Flagged for practitioner confirmation.)

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 Gua Di (Pedicellus Melo, Cucumis melo pedicel)?

  Yes — laboratory research on Gua Di’s cucurbitacin constituents (chiefly cucurbitacin B and D) supports both its traditional emetic/purgative action and its toxicity, with some preclinical hepatoprotective and anti-cancer findings; human clinical trials on Gua Di itself are lacking.

  • Gastrointestinal pharmacology (animal) — an ethanol extract of muskmelon base (Pedicellus Melo) showed prokinetic gastrointestinal action in animal models, supporting the traditional use for abdominal distention; cucurbitacin D was identified as a laxative-active constituent of the extract.
  • Hepatoprotective mechanism (preclinical) — cucurbitacin B, a principal constituent of the Cucumis melo pedicel, reduced cholestatic liver injury in animal/cell models by suppressing inflammation via the IL-6/STAT3/HIF-1α pathway — a modern pharmacological angle relevant to Gua Di’s traditional use for damp-heat jaundice, though this studied the isolated compound in animal/cell models, not Gua Di given to humans.
  • Anti-cancer research (preclinical) — a scoping review found cucurbitacin B derived from Cucumis melo pedicel showed anti-cancer activity across several tumor types in vitro and in animal models, while explicitly noting the absence of clinical trials and calling for further dosing and safety data before any clinical application.
  • Toxicity context (related cucurbits, not Gua Di itself) — human poisoning cases from other cucurbitacin-containing cucurbits document how dangerous this compound class can be: a case series of five adults after eating bitter bottle gourd developed rapid-onset vomiting, diarrhea, and gastrointestinal bleeding, and a separate case report describes a bottle-gourd drink causing severe distributive shock. These are not studies of Gua Di itself, but of the same toxic compound class it contains, and help explain why its traditional dose ceiling is kept so low.

  Overall: mechanistic and preclinical support for Gua Di’s traditional emetic, jaundice, and toxicity profile exists, but no human clinical trials of Gua Di itself were found; treat all of the above as laboratory/preclinical evidence and cross-species toxicity context, not clinical proof.

  Note: the current record gives the Latin as “Pedicellus Cucumeris,” while the research and wider materia medica literature more often uses “Pedicellus Melo” (from Cucumis melo, muskmelon). We believe these refer to the same substance; the identity field is left unchanged pending owner confirmation. The record also lists the Stomach channel only, while a number of materia medica sources also list the Spleen channel; noted here rather than changed.

  Sources: PMID 22543170 (ethanol extract of muskmelon base/Pedicellus Melo, prokinetic pharmacology); PMID 38104874 (cucurbitacin B and cholestatic liver injury, Journal of Ethnopharmacology); PMID 39247112 / PMC 11377003 (Cucumis melo anti-cancer scoping review); PMID 36460279 (cucurbitacin B pharmacology/toxicity review, Pharmacology Research); PMID 24360122 (bitter bottle gourd toxicity case series); DOI 10.7326/aimcc.2023.1037 (cucurbit-toxin distributive shock case report). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is Gua Di San, and how is Gua Di combined with other herbs?

  Gua Di’s best-known use is inside Gua Di San (Melon Pedicle Powder), a classical emergency formula that pairs it with Chi Xiao Dou (adzuki bean) and Dan Dou Chi (fermented soybean) to induce vomiting and clear phlegm or retained food from the chest and epigastrium. It is a narrow, purpose-built emetic prescription rather than a routine tonifying or symptom-management formula.

  • Gua Di (chief/king herb) — supplies the emetic action.
  • Chi Xiao Dou (adzuki bean, deputy) — traditionally described as assisting Gua Di’s action of draining accumulation from the chest.
  • Dan Dou Chi (fermented soybean, assistant) — decocted separately into a broth used to carry and moderate the powder.

  Traditional indications recorded for the formula include phlegm or undigested food obstructing the chest with a felt need to vomit but inability to do so spontaneously, and phlegm-obstruction presentations with breathing difficulty or restlessness. Outside of this formula, Gua Di is not commonly paired into everyday tonifying combinations, consistent with its narrow, emergency-only traditional role.

  Source: Gua Di San formula record (Sacred Lotus formula database); cross-referenced classical-formula descriptions of Gua Di San.

This herb is considered toxic