All-Grass of Common Ducksmeat

Chinese
浮萍
Pinyin
Fu Ping
Latin
Herba Spirodelae

TCM Properties

Taste
acrid
Temperature
cold
Channels
Lung, Urinary Bladder

Traditional Use

Primary Actions

  • Releases the exterior and disperses Wind-Heat — used for Wind-Heat exterior patterns with fever, headache, and absence of sweating
  • Vents rashes and relieves itching — used for measles (before rash has fully expressed), urticaria, and wind-heat skin eruptions

Secondary Actions

  • Promotes urination and reduces edema — used for superficial edema and oliguria from water retention with exterior heat
  • Dispels Wind and relieves itching — used topically for pruritus and eczema from wind-heat in the skin

Modern Research

Active Compounds

  • Luteolin and apigenin — primary flavones; potent anti-inflammatory via NF-κB inhibition; luteolin and apigenin show strong binding affinity for TNF and IL-6 targets
  • Orientin and vitexin — flavone C-glycosides; antioxidant and anti-inflammatory
  • β-Carotene and lutein — carotenoids; antioxidant
  • β-Sitosterol — phytosterol with anti-inflammatory and cholesterol-lowering properties
  • Potassium acetate and potassium chloride — mineral salts contributing to diuretic effect
  • Choline and betaine — nitrogen-containing compounds with membrane and metabolic roles

Studied Effects

  • Anti-inflammatory (in vitro) — ethanolic extract inhibits LPS-induced NO, PGE2, IL-6, and TNF-α production in RAW264.7 macrophages; suppresses iNOS and COX-2 via NF-κB p65 attenuation; flavonoid content 0.25–8.77 mg/g (PMID 22303922)
  • Anti-inflammatory contact dermatitis (in vivo) — extract ameliorates DNFB-induced skin lesions and histopathological abnormalities in mice; inhibits inflammatory cytokines TNF-α and IL-6, validating traditional use for skin heat conditions (PMID 37686078)

PubMed References

Safety & Interactions

Contraindications

  • Exterior deficiency with spontaneous sweating — acrid diaphoretic nature worsens spontaneous perspiration from Qi deficiency
  • Blood deficiency without exterior pathogen — drains superficial Wei Qi and Ying-Qi; avoid in interior vacuity without exterior condition

Cautions

  • Short-term use recommended — diaphoretic herbs deplete superficial Wei Qi with prolonged use; limit to acute exterior conditions
  • MSK page not found — drug interaction data not available from Memorial Sloan Kettering integrative medicine database

Conditions