Dispels Wind-Damp and relieves Bi syndrome — principal indication; rheumatic joint and muscle pain, especially with cold-damp predominance and stiffness
Warms the channels and disperses Cold — deep cold-obstructed pain in joints, the lumbar region, and knees
Relaxes sinews and resolves contracture — muscle spasm, sinew tightening, and impaired movement from chronic Wind-Cold-Damp Bi
Activates Blood and disperses stasis — traumatic injury, post-injury swelling, and bruising
Secondary Actions
Promotes menstruation — Blood-moving action used for dysmenorrhea and amenorrhea with cold-type stagnation pattern
External use: decoction wash for arthritic joints, traumatic injury, and skin conditions in north China folk medicine
Classic Formulas
Tou Gu Cao Tang (透骨草汤) — classical decoction for Wind-Cold-Damp Bi syndrome; Tou Gu Cao combined with Chuan Wu (川乌, processed), Cao Wu (草乌, processed), Ma Qian Zi (马钱子, processed), and Ru Xiang (乳香) — used externally as a hot soak for severe chronic joint pain
Combined with Wei Ling Xian (威灵仙), Du Huo (独活), and Ji Xue Teng (鸡血藤) in oral formulas for rheumatoid arthritis and osteoarthritis with cold-predominant Wind-Damp pattern
Classical References
Ben Cao Gang Mu Shi Yi (本草纲目拾遗): records Tou Gu Cao (透骨草, 'penetrate-bone herb', named for its ability to relieve deep bone-level pain) as a powerful pungent-warm herb that 'enters the sinews and bones to dispel cold-damp, open the channels, and stop severe pain — superior for Bi syndrome that has become entrenched in the deeper tissues'
SPECIES NOTE: The official Chinese Pharmacopoeia 2020 source for Tou Gu Cao is Speranskia tuberculata (Bunge) Baill. (Euphorbiaceae); the name Tou Gu Cao is also applied to other plants in regional folk medicine including Impatiens balsamina (herb #84 in this database, 凤仙透骨草); the two variants share Wind-Damp Bi indications but Speranskia tuberculata is the pharmacopoeial standard
Modern Research
Active Compounds
Speranskin and related diterpenoids (Euphorbiaceae characteristic; anti-inflammatory)
Kaempferol, quercetin, and luteolin glycosides (flavonoids; anti-inflammatory, antioxidant)
Gallic acid and ellagic acid (hydrolysable tannins; antioxidant, antimicrobial)
β-Sitosterol and daucosterol (phytosterols; anti-inflammatory)
Phenylpropanoids: chlorogenic acid, caffeic acid
Studied Effects
Anti-inflammatory and analgesic: flavonoid and diterpenoid fractions from Speranskia tuberculata inhibit COX-2 and prostaglandin synthesis; rodent models confirm significant analgesic effect in hot-plate, tail-flick, and acetic acid writhing tests — pharmacological basis for the Bi-syndrome pain-relieving application
Anti-arthritic: aqueous extract of S. tuberculata reduces joint swelling, synovial inflammation, and pro-inflammatory cytokine (IL-1β, TNF-α) levels in complete Freund's adjuvant-induced arthritis models; anti-arthritic efficacy comparable to low-dose aspirin in joint histopathology — validates the cold-Damp rheumatic arthritis indication
Antioxidant: gallic acid and quercetin glycosides from S. tuberculata demonstrate significant DPPH and ABTS radical scavenging; reduction of lipid peroxidation in articular tissue may contribute to the anti-arthritic therapeutic effect
Safety & Interactions
Contraindications
Heat-type Bi syndrome (hot, red, swollen joints with fever and rapid pulse) — warm-pungent nature contraindicated with Heat
Yin Deficiency with internal Heat
Cautions
Standard dose: 9–15 g dried herb in decoction; external soak/wash: 30–60 g
Topical concentrated decoction: prolonged skin contact may cause mild irritation; dilute or limit soak time if irritation occurs
Blood-moving activity: use with caution in patients on anticoagulant or antiplatelet therapy
Pregnancy: pungent-warm Blood-moving herb; traditional contraindication in pregnancy