Hirudo (Shuizhi)

Naming
Shui Zhi (Hirudo)-Shen Nong Ben Cao Jing (Shen Nong’s Herbal)

Origin
The dry body of Whitemania Pigra Whitman or Hirudo nipponica Whitman and W. acranulata Whitman of family Hirudinidae.

Location
Everywhere in China.

Harvest
Collected in summer and autumn.

The actual smell and taste
Lightly stinky smell.

Best quality
Small, regular, black and brown, purified.

Processing
Unprocessed or blanched by Hua Shi powder.

Property
Salty, bitter, neutral, lightly toxic; liver meridian entered.

Actions
Break blood and dispel stasis.

Indications
Amenorrhea due to stasis, mass, traumatic injuries.

Being salty this herb enters blood system and being bitter it can purge and descend. It enters blood system of liver meridian and can break blood stasis and dispel blood stasis, attack mass, resolve stagnation and accumulation, induce menstruation and alleviate pain, It is indicated for mass, amenorrhea due to stasis and traumatic injuries. It is mutually reinforced by the combination with Meng Chong. For Amenorrhea and mass, it is usually combined with blood-breaking and stasis-eliminating herbs. For instance it is combined with Tao Ren and Meng Chong in Di Dang Tang from Shang Han Lun. For weak body association, it is combined with qi and blood tonics such as Ginseng-(Renshen).shtml" target='_blank' title="Radix Ginseng (Renshen)">Radix Ginseng (Renshen), Radix Angelicae Sinensis (Danggui). For traumatic injuries, it is combined with blood-activating and trauma-curing herbs such as Su Mu and Zi Ran Tong.

Dosage and Administrations
Decoct l.5~3 g. Grind into powder and take 0.3～0.5 g. More appropriate in pill and powder or take powder because the hirudin it contains will be easily broken when heating or exposure to dilute hydrochloric acid.

Cautions
Prohibited for pregnant women and patients with excessive menstruation.