About This Formula*
Traditional Chinese Medicine background and properties
Formula Description*
A modern antiparasitic formula designed to expel roundworms from the bile ducts. It combines herbs that calm and paralyse roundworms with herbs that move Qi, relieve pain, and promote their expulsion through the intestines. It is primarily used for biliary ascariasis, a condition where roundworms migrate into the biliary tract causing severe colicky upper abdominal pain, nausea, and vomiting.
Formula Category*
Main Actions*
- Expels Parasites
- Calms Roundworms and Stops Pain
- Alleviates Pain
- Soothes the Liver and Regulates Qi
- Clears Damp-Heat from the Liver and Gallbladder
TCM Patterns*
In TCM, symptoms don't appear randomly — they cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Dan Dao Qu Hui Tang is traditionally associated with these specific patterns.
The following describes this formula's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Dan Dao Qu Hui Tang addresses this pattern
When roundworms migrate from the intestine into the biliary tract, they obstruct normal bile flow and cause intense spasmodic pain in the upper abdomen that often radiates to the back. This pattern presents with sudden onset of severe drilling pain below the right ribs or in the epigastrium, accompanied by nausea, vomiting (sometimes containing roundworms), and a sensation of something moving in the abdomen. The formula addresses this pattern by using Wu Mei's sour nature to calm the worms and relieve spasm, Bing Lang and Shi Jun Zi to kill the parasites, Ku Lian Pi to clear Heat from the infection, Mu Xiang and Zhi Ke to regulate Qi and stop pain, and Da Huang to purge the dead worms from the intestines.
A practitioner would look for one or more of these signs
Sudden, severe boring or colicky pain in the upper right abdomen or epigastrium
Nausea and vomiting, sometimes with worm fragments visible in vomitus
Vomiting of clear fluid or bile, may contain roundworms
Abdominal bloating between episodes of colic
Cold hands and feet during acute colic episodes
Why Dan Dao Qu Hui Tang addresses this pattern
Intestinal roundworm infestation is the underlying condition that gives rise to biliary ascariasis. Roundworms dwelling in the small intestine can become agitated by fever, certain foods, or medications and migrate upward into the bile duct. This formula not only addresses the acute biliary crisis but also treats the underlying intestinal parasitic burden. The combination of three vermicidal herbs (Bing Lang, Shi Jun Zi, Ku Lian Pi) ensures broad antiparasitic coverage, while Da Huang purges the intestines to expel both living and dead worms. Mu Xiang and Zhi Ke address the chronic symptoms of Qi stagnation and digestive disruption that accompany intestinal parasitosis.
A practitioner would look for one or more of these signs
Periumbilical colicky pain, often worse on an empty stomach
Irregular appetite with unusual food cravings
Weight loss and malnutrition despite adequate food intake
Yellowish complexion with poor luster
How It Addresses the Root Cause*
Biliary ascariasis (胆道蛔虫症) occurs when roundworms (Ascaris lumbricoides), normally residing in the intestines, migrate upward through the sphincter of Oddi and enter the bile duct. In TCM terms, this condition involves a disruption of the Liver and Gallbladder's smooth flow of Qi. The worms are a tangible pathogenic factor (虫积) that physically obstructs the biliary passages, causing the Liver and Gallbladder Qi to stagnate severely. This produces the hallmark symptom: sudden, excruciating pain below the right ribcage (right hypochondriac region), often described as drilling or boring in character, which comes and goes in waves as the worm moves.
The disease mechanism typically involves an underlying pattern of intestinal cold mixed with upper heat (上热下寒). When the intestinal environment becomes inhospitable to the worms — often due to cold in the intestines or heat in the upper digestive tract — the worms become restless and migrate upward, seeking a warmer environment. This "fleeing" behavior is what drives them into the bile duct. As the worms irritate the biliary tract, they cause spasm and inflammation, which can lead to secondary Damp-Heat accumulation in the Liver and Gallbladder, producing symptoms like fever, jaundice, nausea, and vomiting. The Stomach Qi rebels upward (causing vomiting, sometimes with visible worms), while the Liver and Gallbladder lose their ability to ensure smooth Qi flow.
Dan Dao Qu Hui Tang addresses this mechanism on multiple fronts: it uses sour-flavored herbs to calm the restless worms (since roundworms become still when exposed to sourness), antiparasitic herbs to kill and expel the worms from the biliary tract, and Qi-regulating herbs to restore smooth flow through the Liver and Gallbladder system, thereby relieving the intense colicky pain.
Formula Properties*
Slightly Cool
Predominantly sour and bitter with pungent notes — sour to calm the worms, bitter to kill and expel them downward, pungent to move stagnant Qi and relieve pain.
Formula Origin
This is just partial information on the formula's TCM properties. More detailed information is available on the formula'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.
