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Leech, Shui Zhi 水蛭Shui Zhi (TCM)
Jonk, Pichchian, Jonkan (Unani) |
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Dioscorides Materia Medica, Mathias, 1563
Materia Medica Animalia, Peter Peyto Good, 1853
Dried Leech as used in TCM.
(Chengdu Medicine Market, Adam, 2009)
(Chengdu Medicine Market, Adam, 2009)
Entomological name:
Hirudo and Whitmania spp.
In TCM, the primary species used are H. nipponica Whitman, W. acranulata, W. pigra. Over 50 different species supply the market in TCM. H. medicinalis was used in Europe to draw blood.
Three main different types of Leech have been noted in Chinese texts:
1. Small Leech, or Gold-margined Leech; less than 5cm long (considered best)
2. Large or Wide Leech
3. Long and narrow Leech, also called Willow-leaf Leech
Parts used:
Dried and prepared Leech
Temperature & Taste:
Neutral, Salty, Bitter, slightly Toxic
Classification:
K. Move the Blood
Hirudo and Whitmania spp.
In TCM, the primary species used are H. nipponica Whitman, W. acranulata, W. pigra. Over 50 different species supply the market in TCM. H. medicinalis was used in Europe to draw blood.
Three main different types of Leech have been noted in Chinese texts:
1. Small Leech, or Gold-margined Leech; less than 5cm long (considered best)
2. Large or Wide Leech
3. Long and narrow Leech, also called Willow-leaf Leech
Parts used:
Dried and prepared Leech
Temperature & Taste:
Neutral, Salty, Bitter, slightly Toxic
Classification:
K. Move the Blood
Uses:
1. Clears Stagnant Blood, Reduces Swellings and Masses, Eases Pain:
-Amenorrhea, Dysmenorrhea
-immobile Abdominal Masses,
-internal Bruising from Trauma, as well as Fractures.
-has been used as an Abortifacient, and for Sterility from Blood Stasis.
-irregular blood cells, toxic conditions of the blood, Tumors and Cancers, especially of the Uterus.
-used similarly in the west from 1903 in the form of the extract 'Hirudin'.
2. Promotes Urine:
-Edema, fluid retention
-Chronic Glomerulonephritis
3. Externally to Draw Blood:
-Long used externally to draw blood. It was used for bleeding local areas where there was congestion, pain, swelling, or tumors such as is seen in localised inflammation, hemorrhoids, scrofula, angina, hepatitis etc.
-In TCM, Ayurveda and Europe, Leeches were applied to toxic boils and swellings to draw out the poison.
4. Externally:
-ashes were used in the west as a Depilatory
-Venous congestion; Varicose Veins; Varicose Ulcers; Hemorrhoids.
-Acute heat and inflammation in a local area; skin inflammations including Herpes, Boils.
-Chronic, stabbing and violent Headaches from Heat or excess Blood.
-Suppressed Menstruation (applied to the ankles or lower limbs).
-Arthritic pain with dark colored joints (from blood stagnation).
-Tendonitis; strains and sprains of the Muscles; acute Trauma.
-Swellings; Tumors; Hepatitis; Scrofula
DOSE:
3–6 grams in decoction (to 9 grams for Cancer); 300–1500mg in pills or powder (to 3 grams for Cancer)
PREPARATION:
1. Stir-Fried Leech:
They can be heated in ashes or toasted to yellow. Some recommended cutting them very finely then roasting to yellow to ensure no eggs would hatch.
Alternatively, Talcum powder can be heated in a Wok until it flows (moves freely), then section of cut dried Leech are added and stirred until swollen, yellowish and crisp. They are removed from the heat and the Talcum is sifted off. This reduces toxicity, and facilitates powdering for use in pills and powders.
NOTE:
It is a potent anti-coagulant, hirudin being comparable to warfarin. Leech has also demonstrated fibrinolytic, anti-tumor and anti-cancer activity
3–6 grams in decoction (to 9 grams for Cancer); 300–1500mg in pills or powder (to 3 grams for Cancer)
PREPARATION:
1. Stir-Fried Leech:
They can be heated in ashes or toasted to yellow. Some recommended cutting them very finely then roasting to yellow to ensure no eggs would hatch.
Alternatively, Talcum powder can be heated in a Wok until it flows (moves freely), then section of cut dried Leech are added and stirred until swollen, yellowish and crisp. They are removed from the heat and the Talcum is sifted off. This reduces toxicity, and facilitates powdering for use in pills and powders.
NOTE:
It is a potent anti-coagulant, hirudin being comparable to warfarin. Leech has also demonstrated fibrinolytic, anti-tumor and anti-cancer activity
Main Combinations:
1. Pain, bruising and swelling from trauma, Leech 1 part, Rhubarb 2 parts; form pills. (TCM)
2. Immobile abdominal masses, with Turmeric and Dang Gui. (TCM)
3. Cerebral Thrombosis, with Bezoar and Antelope horn (TCM)
4. Skin Cancer, with Rhubarb and Indigo as an ointment (with sesame oil and bees wax) (TCM)
Cautions:
1. Not used during pregnancy
2. Should not be used in cases of chronic gastritis or gastrointestinal bleeding.
3. Careful that viable eggs are not swallowed. They can be cut finely and heated until yellow to kill eggs. The fine powder is sieved to ensure no eggs are taken. A tincture is perhaps the best preparation.
TOXICITY:
1. Overdose can cause nausea and vomiting. Severe overdose can cause gastrointestinal bleeding, hematuria and severe abdominal pain.
2. LD50 of subcutaneous injection of the decoction of Leech in mice was 15 g/kg.
DRUG INTERACTION:
1. Not used concurrently with Blood thinning medicines such as Warfarin.
Main Preparations used:
1. Not used during pregnancy
2. Should not be used in cases of chronic gastritis or gastrointestinal bleeding.
3. Careful that viable eggs are not swallowed. They can be cut finely and heated until yellow to kill eggs. The fine powder is sieved to ensure no eggs are taken. A tincture is perhaps the best preparation.
TOXICITY:
1. Overdose can cause nausea and vomiting. Severe overdose can cause gastrointestinal bleeding, hematuria and severe abdominal pain.
2. LD50 of subcutaneous injection of the decoction of Leech in mice was 15 g/kg.
DRUG INTERACTION:
1. Not used concurrently with Blood thinning medicines such as Warfarin.
Main Preparations used: