About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Long Dan Cao (Chinese gentian root) is one of the most powerfully bitter and cold herbs in Chinese medicine, used to drain excess Heat from the Liver and Gallbladder and to clear Damp-Heat from the lower body. It is commonly used for conditions like red, painful eyes, headaches with irritability, rib-side pain, bitter taste in the mouth, and urogenital inflammation with itching or discharge. Because of its very cold nature, it is typically used short-term and is not suitable for people with weak digestion or cold constitutions.
Herb Category*
Main Actions*
- Clears Heat and dries Dampness
- Drains Liver and Gallbladder Fire
- Clears Damp-Heat from the Lower Burner
- Arrests Convulsions
How These Actions Work*
'Clears Heat and dries Dampness' means Long Dan Cao eliminates conditions where Heat and excessive moisture combine in the body, particularly along the Liver and Gallbladder channels. This is one of the most intensely bitter herbs in the Chinese pharmacopoeia, and bitterness in TCM is the taste that dries Dampness and sends things downward. It is especially useful for jaundice caused by Damp-Heat, vaginal discharge that is yellow or foul-smelling, genital itching and swelling, and eczema with itching and weeping.
'Drains Liver and Gallbladder Fire' means this herb powerfully quenches excess Heat in the Liver and Gallbladder systems. When Liver Fire flares upward, it can cause red, painful eyes, headaches (especially at the temples and top of the head), a bitter taste in the mouth, ringing in the ears or sudden hearing loss, pain along the ribs, and irritability. Long Dan Cao's cold, sinking nature directly opposes and drains this upward-flaring Fire. It is considered the primary herb for excess Liver and Gallbladder Fire conditions.
'Clears Damp-Heat from the Lower Burner' refers to this herb's ability to resolve conditions involving Heat and Dampness in the pelvic and urogenital areas. This includes painful or burning urination, genital swelling, itching, abnormal discharge, and scrotal eczema. Because the Liver channel runs through the genital region, Long Dan Cao's strong affinity for the Liver channel makes it especially effective here.
'Calms convulsions' refers to its use for high fever with convulsions or spasms, particularly in children. In TCM, extreme Liver Heat can generate internal Wind, which manifests as tremors, seizures, or muscle spasms. By powerfully draining Liver Fire, Long Dan Cao removes the root cause driving these convulsions.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Long Dan Cao is traditionally associated with these specific patterns.
The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Long Dan Cao addresses this pattern
Long Dan Cao is the premier herb for Liver Fire blazing upward. Its intensely bitter and cold nature directly opposes the hot, rising nature of Liver Fire. It enters the Liver and Gallbladder channels where it powerfully drains excess Heat, counteracting the upward flaring that causes head and eye symptoms. The bitter taste forces Qi downward, while the cold nature extinguishes the Fire. Classical sources describe it as 'greatly bitter, greatly cold' and the primary medicinal for Liver and Gallbladder excess Fire.
A practitioner would look for one or more of these signs
Throbbing headache, especially at the temples or vertex
Red, swollen, painful eyes
Sudden onset tinnitus or hearing loss
Irritability and restlessness
Persistent bitter taste in the mouth
Why Long Dan Cao addresses this pattern
Long Dan Cao is uniquely suited for Liver and Gallbladder Damp-Heat because it simultaneously dries Dampness and clears Heat through both the Liver channel and the lower body. Its bitter taste dries the pathological Dampness, while its cold nature clears the Heat component. The herb's naturally downward-draining action follows the path of Damp-Heat as it pools in the lower body, making it especially effective for symptoms in the urogenital region where the Liver channel passes. It addresses both the upper symptoms (rib-side pain, bitter mouth) and lower symptoms (genital itching, abnormal discharge) of this pattern.
A practitioner would look for one or more of these signs
Jaundice with yellow, greasy tongue coating
Yellow, foul-smelling vaginal discharge
Genital itching and swelling
Burning or painful urination
Eczema with itching, especially in the groin area
Why Long Dan Cao addresses this pattern
When extreme Liver Fire generates internal Wind, the result can be high fevers with convulsions and spasms, especially in children. Long Dan Cao addresses the root cause by powerfully draining the Liver Fire that is generating the Wind. By extinguishing the Fire, it removes the driving force behind the convulsions. In this context it is typically combined with other Wind-calming and convulsion-stopping herbs, but Long Dan Cao plays the critical role of eliminating the Heat source.
A practitioner would look for one or more of these signs
Febrile convulsions, especially in children
High fever with restlessness
Muscle twitching and spasms
TCM Properties*
Cold
Bitter (苦 kǔ)
Root (根 gēn)
This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.