Black-Tail Snake

Chinese
乌梢蛇
Pinyin
Wu Shao She
Latin
Zaocys

TCM Properties

Taste
sweet
Temperature
neutral
Channels
Liver

Traditional Use

Primary Actions

  • Dispels Wind-Damp and unblocks the collaterals - used for stubborn wind-damp arthralgia, numbness, spasms, and chronic weakness of the limbs when the channels need a penetrating animal medicinal.
  • Extinguishes wind and stops convulsions - applied for childhood convulsions, tetanus, tremor, and post-stroke spasticity when internal wind lodges in the channels.
  • Searches out wind to relieve itching - valued for rubella, pruritic skin disorders, and chronic itchy dermatoses that resist gentler wind-relieving herbs.
  • Offers a milder snake-medicine option than toxic viper drugs - Wu Shao She is traditionally chosen when the practitioner wants the collateral-unblocking action of snake medicines without the stronger toxicity of Bai Hua She.

Secondary Actions

  • Because it is neutral and non-toxic by classical comparison, Wu Shao She can be used more flexibly and for longer courses than more forceful venomous snake medicinals.
  • It is often stir-baked with wine or made into powder to enhance channel-penetrating use in chronic Wind-Damp Bi and sequelae of windstroke.

Classic Formulas

  • Da Huoluo Dan (大活络丹) - major wind-damp and stroke-sequelae formula in which Wu Shao She joins other animal and plant medicinals to dredge collaterals, alleviate pain, and calm internal wind.
  • Classical snake-pair prescriptions combining Wu Shao She with Bai Hua She or Wu Gong - used when deeper channel wind, spasms, or resistant skin disease require stronger search-out action than plant medicinals alone.

Classical References

  • TCM Wiki and Me and Qi describe Wu Shao She as sweet and neutral, entering the Liver channel and dispelling wind-damp, unblocking collaterals, stopping convulsions, and relieving itching.
  • TCM Wiki specifically notes its use for long-standing wind-damp arthralgia, hemiplegia after windstroke, childhood convulsions, tetanus, and pruritic skin disease.
  • Me and Qi contrasts Wu Shao She with more toxic snake medicinals and presents it as the gentler non-toxic snake option within the wind-damp category.

Modern Research

Active Compounds

  • Collagen-rich structural proteins (animal proteins) - part of the dried-body matrix that underlies the powder and decoction material
  • Bioactive peptides and amino acids (protein-derived constituents) - likely contributors to broad modern biochemical interest in animal medicinal substances
  • Phospholipids and fatty acids (lipid fraction) - part of the whole-body nutrient and membrane matrix of the prepared snake material
  • Trace minerals and connective-tissue matrix components (animal tissue matrix) - contribute to the complex profile of the dried-body medicinal

Studied Effects

  • Modern PubMed literature on Wu Shao She is weighted more toward authentication and quality control than toward direct pharmacology; a PCR-based assay was developed specifically to verify Zaocys dhumnades in the medicinal trade (PMID 28035866)
  • Conservation and sourcing have become increasingly important research themes - a 2023 barcoding study of Chinese snakes highlighted hidden diversity and the need for accurate species-level identification in medicinal use (PMID 36924341)
  • Safety-oriented zoological research found very high Spirometra spargana prevalence in wild Zaocys dhumnades populations, underscoring why proper sourcing and processing matter for this animal medicinal (PMID 32103785)

PubMed References

Safety & Interactions

Contraindications

  • Severe Qi and Blood deficiency without concurrent Wind-Damp, spasm, or itching pathology
  • Cases where a non-animal wind-damp herb would adequately address the presentation

Cautions

  • Although Wu Shao She is considered non-toxic by traditional comparison, animal-derived material still requires careful sourcing, cleaning, and processing
  • Wild-caught snakes may harbor parasites, so only properly processed medicinal-grade material should be used
  • MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database

Conditions