Ingredient Animal — whole (全虫 quán chóng)

Meng Chong

Gadfly / Horsefly · 虻虫

Tabanus bivittatus Matsumura · Tabanus

Also known as: Fēi Méng (蜚虻), Niú Méng (牛虻), Niú Wén Zi (牛蚊子),

Meng Chong (Gadfly / Horsefly) plant

Images shown are for educational purposes only

Meng Chong (gadfly or horsefly) is one of the strongest Blood-moving substances in Chinese medicine, used for severe Blood stasis that causes missed periods, abdominal masses, or pain from old injuries. Because it is potent and slightly toxic, it is only used under professional guidance for confirmed Blood stasis conditions, and is never used during pregnancy or by people who are weak or depleted.

Category Blood-invigorating and stasis-dispelling herbs (活血化瘀药) Blood-breaking and mass-dispersing herbs (破血消癥药)
Therapeutic focus Menstrual Health Gynecological masses Circulation Support Injury and Trauma Recovery

TCM Properties

Temperature

Cool

Taste

Bitter (苦 kǔ)

Channels entered

Liver

Parts used

Animal — whole (全虫 quán chóng)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Meng Chong does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Meng Chong is primarily used to support these areas of health:

Menstrual Health Gynecological masses Circulation Support Injury and Trauma Recovery

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Meng Chong performs to restore balance in the body:

Breaks Blood and Dispels Stasis Transforms and Expels Blood Stasis Disperses Accumulations and Dissipates Nodules Promotes Menstruation

How these actions work

'Breaks Blood stasis' (破血逐瘀) is Meng Chong's primary and most powerful action. Unlike gentler Blood-moving herbs that nudge circulation along, Meng Chong forcefully breaks apart severe, deep-seated, old Blood stasis. This is why classical texts describe it as an insect that "bites into" Blood, analogous to how the live horsefly pierces the skin of cattle to feed on blood. It is considered one of the most potent Blood-breaking substances in the entire materia medica, and is reserved for stubborn Blood stasis that milder herbs cannot resolve.

'Disperses accumulations and masses' (散积消癥) means Meng Chong can break down palpable abdominal masses (called zhēng jiǎ in TCM) caused by long-standing Blood stasis. These may correspond to conditions like uterine fibroids, ovarian cysts, or hepatosplenomegaly in modern medicine. Because its bitter and cool nature enters the Liver channel's Blood level, it works specifically on Blood-related masses rather than Qi-type accumulations.

'Unblocks the menses' (通经) refers to its ability to restore menstrual flow when periods have stopped due to severe Blood stasis blocking the uterus. This is not a gentle menstruation-regulating action. It is used when menstruation has been absent for months and other Blood-moving herbs have failed. Because of this powerful action, it is strictly forbidden during pregnancy.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Meng Chong is used to help correct these specific patterns.

Why Meng Chong addresses this pattern

Meng Chong is bitter and cool, entering the Liver channel's Blood level. Its bitter taste has a strong descending and draining quality ('bitter drains downward'), which makes it especially effective at breaking through Blood stasis that has lodged in the lower abdomen. In this pattern, Heat and stagnant Blood have bound together in the lower Jiao (lower burner), producing a hardened lower abdomen, dark stools, and mental agitation. Meng Chong's forceful Blood-breaking action directly attacks this bound stasis, while its cool nature helps clear the Heat component of the stasis-Heat complex. Classical texts note it as a 'Liver channel Blood-level herb' (肝经血分药), meaning it penetrates to the deepest layer of Blood stagnation in the Liver's domain.

A practitioner would look for one or more of these signs

Amenorrhea

Absence of menstruation due to severe Blood stasis

Lower Abdominal Pain

Hard, distended, painful lower abdomen that resists pressure

Dry Stools

Black or very dark stools indicating old Blood in the intestines

Commonly Used For

These are conditions where Meng Chong is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Blood Stagnation Dry Blood (Gan Xue)

TCM Interpretation

TCM views amenorrhea (absence of menstruation) through several possible lenses, but when Meng Chong is indicated, the root cause is severe Blood stasis in the lower abdomen. The Liver stores Blood and governs its smooth flow. When old, stagnant Blood obstructs the Chong and Ren channels (the two extraordinary vessels most closely tied to menstruation), fresh Blood cannot flow downward to produce a period. The lower abdomen often feels hard and painful to touch. The tongue may be dark or purple with visible stasis spots, and the pulse is typically deep and choppy. This is not the mild irregularity from stress or Qi stagnation; it is a stubborn, physically obstructed blockage.

Why Meng Chong Helps

Meng Chong is one of the most powerful Blood-breaking substances available. Its bitter, cool nature enters the Liver channel at the Blood level, where it forcefully breaks apart the old, hardened stasis that is physically blocking menstrual flow. Where gentler Blood movers like Dan Shen or Yi Mu Cao only nudge circulation, Meng Chong acts like a battering ram against deeply entrenched blockages. It is typically combined with other Blood-breaking herbs (such as Shui Zhi and Tao Ren) and a draining herb like Da Huang, forming the classic Di Dang Tang or Da Huang Zhe Chong Wan. Once the obstruction is broken and the stagnant Blood expelled, fresh Blood can be generated and menstruation can resume.

Also commonly used for

Uterine Fibroids

Abdominal masses from chronic Blood stasis

Ovarian Cysts

Pelvic masses with Blood stasis presentation

Angina

Coronary heart disease with Blood stasis

Deep Vein Thrombosis

Thrombotic and thromboembolic conditions

Trauma

Deep bruising and fixed pain from impact injuries

Endometriosis

With fixed lower abdominal pain and dark menstrual blood

Retained Placenta

Failure of postpartum discharge to clear

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Bitter (苦 kǔ)

Channels Entered

Liver

Parts Used

Animal — whole (全虫 quán chóng)

Dosage & Preparation

These are general dosage guidelines for Meng Chong — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

1–1.5g (decoction); 0.3–0.6g (powder)

Maximum dosage

Do not exceed 3g in decoction or 0.6g in powder form. This is a potent, slightly toxic substance and doses should be kept to the minimum effective amount.

Dosage notes

Meng Chong is used at very low doses compared to most herbs. In decoction, 1–1.5g is standard. When taken as ground powder (swallowed directly or in capsules), the dose is much lower at 0.3–0.6g, since the active compounds are not diluted in a decoction broth. It is also commonly incorporated into pills. Because of its powerful Blood-breaking action, it is almost always combined with other herbs rather than used alone. When treating chronic Blood stasis with underlying deficiency (as in Da Huang Zhe Chong Wan), it is paired with Blood-nourishing and Qi-tonifying herbs to prevent excessive depletion. Practitioners should use the minimum effective dose and discontinue once the Blood stasis has resolved.

Preparation

The raw herb is not used directly. Meng Chong must be processed before internal use: the standard method is to remove the wings and legs, then dry-fry with rice (米炒) until the surface is slightly yellow and the foul odor diminishes. This processing (Bei Meng Chong) reduces toxicity and the strong rancid smell. When used in decoctions, it is simply added with other herbs at the standard decoction stage. It is also commonly ground into fine powder for use in pills or for direct ingestion in small amounts.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Meng Chong does

Processing method

The cleaned gadfly (with wings and legs removed) is dry-roasted in a pan over low heat until it turns yellowish-brown or dark brown and becomes crisp, then cooled.

How it changes properties

Baking reduces the herb's slight toxicity and strong fishy odor, making it easier to powder and ingest. The Blood-breaking action is moderated slightly, and the tendency to cause diarrhea (a side effect of the raw form) is diminished. The thermal nature remains cool but the harshness is tempered.

When to use this form

This is the standard clinical form used in virtually all prescriptions. The raw form is too pungently odorous, mildly toxic, and harsh on the digestive tract. Baked Meng Chong is appropriate for Blood stasis causing amenorrhea, abdominal masses, and traumatic injury pain.

Common Ingredient Pairs

These ingredients are traditionally combined with Meng Chong for enhanced therapeutic effect

Shui Zhi
Shui Zhi 1:1 (equal amounts, as in Di Dang Tang)

Meng Chong and Shui Zhi (leech) are the classic insect Blood-breaking pair from Zhang Zhongjing's formulas. Shui Zhi is skilled at breaking Blood stasis without damaging new Blood, while Meng Chong is even more powerful in its Blood-breaking force. Together they achieve a level of stasis-dispersing power that neither accomplishes alone, penetrating into the deepest Blood-level obstructions.

When to use: Severe Blood stasis in the lower abdomen with hard, palpable masses, amenorrhea, mental agitation or mania, dark stools, and a deep choppy pulse. The hallmark indication is the Shang Han Lun's lower Jiao Blood accumulation syndrome.

Da Huang
Da Huang Da Huang 9g : Meng Chong 5g

Da Huang (rhubarb) clears Heat and drives stagnation downward through the bowels, while Meng Chong breaks apart the Blood stasis itself. Together, Da Huang provides a route for the broken-up stasis to be expelled from the body (via the stool), while its Heat-clearing action addresses the Heat component that often accompanies severe Blood stasis.

When to use: Blood stasis with Heat signs in the lower abdomen, producing dark or black stools, abdominal hardness, and restlessness. This pair forms the core therapeutic axis of Di Dang Tang.

Tao Ren
Tao Ren Tao Ren 9g : Meng Chong 5g

Tao Ren (peach kernel) is a milder plant-based Blood mover that lubricates and softens congealed Blood, while Meng Chong provides forceful breaking power. Tao Ren's oily nature helps smooth the passage of broken-up stasis through the channels, complementing Meng Chong's sharp, penetrating action.

When to use: Blood stasis causing amenorrhea, postpartum retention of lochia, or abdominal masses. The pair appears together in both Di Dang Tang and Da Huang Zhe Chong Wan.

Tu Bie Chong
Tu Bie Chong 1:1 to 2:1 (Tu Bie Chong : Meng Chong)

Tu Bie Chong (ground beetle / eupolyphaga) is another insect Blood-breaker, but it is gentler than Meng Chong and also has the ability to reconnect broken sinews and mend bones. Together with Meng Chong, they provide a multi-layered attack on Blood stasis. Tu Bie Chong works on the channel and sinew level while Meng Chong penetrates the deeper Blood level.

When to use: Chronic Dry Blood patterns with both deep stasis and musculoskeletal involvement, as seen in Da Huang Zhe Chong Wan. Also useful for severe traumatic injuries with deep bruising and possible bone damage.

Key Formulas

These well-known formulas feature Meng Chong in a prominent role

Di Dang Tang 抵當湯 King

Di Dang Tang (Resistance Decoction) from the Shang Han Lun is the definitive showcase of Meng Chong's Blood-breaking power. Meng Chong and Shui Zhi serve together as King herbs, with Meng Chong described as being even stronger than Shui Zhi in its ability to break through the severe Blood-Heat accumulation in the lower Jiao. This four-herb formula (Meng Chong, Shui Zhi, Tao Ren, Da Huang) is the most potent Blood stasis-expelling formula in the classical repertoire.

Da Huang Zhe Chong Wan 大黃蟅蟲丸 Deputy

Da Huang Zhe Chong Wan (Rhubarb and Eupolyphaga Pill) from the Jin Gui Yao Lue is the classic formula for chronic Dry Blood with deficiency. Meng Chong serves as Deputy, assisting the King herbs (Da Huang and Tu Bie Chong) by adding deep Blood-breaking force. This formula demonstrates how Meng Chong can be used safely in a longer-term pill format when balanced by Blood-nourishing herbs like Sheng Di Huang and Bai Shao.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Shui Zhi
Meng Chong vs Shui Zhi

Both are insect-derived Blood-breaking herbs that enter the Liver channel and are used for severe Blood stasis. Shui Zhi (leech) is noted for its ability to break stasis 'without damaging new Blood and without injuring the Qi level,' making it somewhat safer for prolonged use. Meng Chong is considered even stronger in raw Blood-breaking power but is harsher and more likely to cause diarrhea. Classical texts rank Meng Chong as the strongest, followed by Shui Zhi, then Tu Bie Chong. In practice, Shui Zhi is more commonly used because it is both powerful and relatively gentle on the body.

Tu Bie Chong
Meng Chong vs Tu Bie Chong

Tu Bie Chong (ground beetle) is the mildest of the three classical insect Blood-breakers. It breaks Blood stasis but also reconnects sinews and mends bones, giving it a broader application in traumatic injury. Meng Chong is far more potent at pure Blood-breaking but lacks Tu Bie Chong's tissue-repairing quality. For chronic wasting conditions with Dry Blood, Tu Bie Chong serves as the King herb in Da Huang Zhe Chong Wan because its gentleness suits long-term pill therapy, while Meng Chong assists with deeper stasis penetration.

San Leng
Meng Chong vs San Leng

San Leng (sparganium rhizome) is a plant-based Blood-breaking herb that also disperses accumulations and masses. It is bitter, acrid, and neutral, and enters the Liver and Spleen channels. Compared to Meng Chong, San Leng is considerably milder and is suitable for less severe or more chronic Blood stasis with concurrent Qi stagnation. Meng Chong is reserved for stubborn, deeply entrenched stasis where plant-based herbs alone are insufficient.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Meng Chong

Meng Chong (虻虫, from Tabanidae horseflies) should be carefully distinguished from Mu Meng (木虻), which is listed separately in the Shen Nong Ben Cao Jing with different indications (primarily for eye conditions and infertility). Although both are insects from related families, their therapeutic actions differ significantly. Authentic Meng Chong should come from female horseflies of the genera Tabanus or Atylotus. Other large flies or winged insects may occasionally be mixed in as adulterants. The key identifying features are the large compound eyes, shiny dark thorax, brownish-yellow banded abdomen, and three pairs of legs. The double-banded yellow horsefly variety is distinguished by its yellowish-green coloration and golden hairs.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Meng Chong

Slightly toxic

Meng Chong is classified as slightly toxic (有小毒) in most modern Chinese Materia Medica references, though the Ben Cao Gang Mu records it as 'having toxicity' (有毒). The raw herb has a strong, foul odor and can cause gastrointestinal irritation. Its alcohol extract has demonstrated hemolytic activity in laboratory settings. Processing by dry-frying with rice (米炒) or baking (焙) reduces the toxicity and unpleasant smell, making it easier to take and less likely to cause side effects. The processed form (Bei Meng Chong) is standard for clinical use. Toxicity symptoms from improper use or overdose may include nausea, vomiting, abdominal pain, and diarrhea. At standard processed doses (1–1.5g in decoction or 0.3g as powder), the herb is considered safe when used appropriately for confirmed Blood stasis conditions.

Contraindications

Situations where Meng Chong should not be used or requires extra caution

Avoid

Pregnancy. Meng Chong is a powerful Blood-breaking substance that can stimulate the uterus and has been historically documented to cause miscarriage. Classical texts including the Ri Hua Zi Ben Cao explicitly record its ability to 'expel the fetus' (堕胎).

Avoid

Absence of true Blood stasis. This herb should only be used when there is confirmed, significant Blood stagnation. Using it when amenorrhea or other symptoms are caused by Qi and Blood deficiency rather than actual Blood stasis can seriously damage the body's reserves.

Avoid

Severe Qi and Blood deficiency with emaciation. The Ben Cao Jing Shu states that those who are greatly deficient in Qi and Blood, with a thin and wasted body, must avoid this herb, as its powerful Blood-breaking action will further deplete the body.

Avoid

Active bleeding disorders or heavy menstrual bleeding not caused by Blood stasis. Because Meng Chong has anticoagulant properties and breaks up Blood, it can worsen hemorrhage when the cause is not stagnation.

Caution

Spleen and Stomach weakness with loose stools or diarrhea. The raw herb can irritate the digestive system, and its potent descending action may aggravate digestive weakness.

Caution

Jaundice from Dampness without Blood stasis. The Ben Cao Jing Shu specifically warns that jaundice with a deep, rapid pulse and lower abdominal hardness but without urinary difficulty indicates a non-Blood condition and Meng Chong should not be used.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Absolutely contraindicated during pregnancy. Meng Chong is one of the strongest Blood-breaking substances in the Chinese pharmacopoeia. Classical texts explicitly document its ability to cause miscarriage (堕胎), and the Ben Cao Jing Feng Yuan states that despite its relatively moderate pace of action, it 'can still expel the fetus.' Modern pharmacological research has shown that Meng Chong extract has an excitatory effect on isolated rabbit uterus, confirming the classical warning. Additionally, one English-language source notes that the herb has been shown to cause teratogenic (birth defect) effects. It must never be used during any stage of pregnancy.

Breastfeeding

Meng Chong should be avoided during breastfeeding. As a substance classified as slightly toxic with potent Blood-breaking properties, there is concern about active compounds passing into breast milk. No safety data exists for nursing mothers. Its anticoagulant proteins and potentially hemolytic alcohol-soluble components could pose risks to the nursing infant. Classical sources provide no guidance on breastfeeding use, which itself suggests it was not considered appropriate for postpartum women outside of treating retained lochia under practitioner supervision.

Children

Meng Chong is generally not suitable for children. Its potent Blood-breaking and slightly toxic nature makes it inappropriate for the developing bodies of young patients. Classical literature contains no pediatric dosing guidance for this herb. If use were ever considered necessary in an older child with confirmed severe Blood stasis, it would require strict practitioner supervision with substantially reduced doses, but such situations are exceedingly rare in pediatric practice.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Meng Chong

Anticoagulant and antiplatelet medications: Modern research has confirmed that Meng Chong contains anticoagulant proteins (TAP) that inhibit thrombin activity and prolong clotting time, as well as compounds that inhibit platelet aggregation. Concurrent use with pharmaceutical anticoagulants (warfarin, heparin) or antiplatelet agents (aspirin, clopidogrel) may increase the risk of bleeding. Patients taking these medications should not use Meng Chong without medical supervision.

Thrombolytic agents: Given the demonstrated fibrinolytic and anticoagulant properties of Meng Chong, concurrent use with thrombolytic drugs (streptokinase, alteplase) could potentiate excessive anticoagulation and increase hemorrhagic risk.

Dietary Advice

Foods and dietary considerations when taking Meng Chong

While taking Meng Chong, avoid cold and raw foods that may impede Blood circulation, as this would work against the herb's Blood-moving action. Avoid excessive consumption of greasy or heavy foods that could burden the Spleen and Stomach, which may already be stressed by this potent substance. Light, easily digestible, and Blood-nourishing foods (such as dark leafy greens, dates, and well-cooked grains) are advisable to support the body while the herb does its work.

Botanical Description

Physical characteristics and morphology of the Meng Chong source animal

Meng Chong is not a plant but an insect-derived medicinal substance. It comes from the dried whole body of female horseflies (gadflies), primarily Tabanus bivittatus Matsumura (known as the double-banded yellow horsefly, 双斑黄虻) and Tabanus mandarinus Schiner (the Chinese horsefly, 华虻), both belonging to the family Tabanidae.

These are large, robust flying insects measuring 13–18mm in length. The Chinese horsefly (T. mandarinus) is greyish-black with large compound eyes, a shiny shell-like thorax, and a brownish-yellow abdomen with distinctive white spots across six body segments. The double-banded yellow horsefly (T. bivittatus) is yellowish-green with large eyes bearing a narrow black horizontal band, transparent wings with yellow veins, and a dark yellowish-grey abdomen with golden hairs and large yellow patches on the sides of the dorsal plates.

Female horseflies are blood-feeding insects that bite cattle, horses, donkeys, and other livestock to obtain blood meals. Males do not bite and feed only on plant nectar. These insects inhabit grasslands and wooded areas, are sun-loving, and are most active during daylight hours in summer. Only the female insects are used medicinally.

Sourcing & Harvesting

Where Meng Chong is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer, typically June to August, when horseflies are most active and abundant.

Primary growing regions

Meng Chong is distributed widely across China. Major producing regions include Guangxi, Sichuan, Zhejiang, Jiangsu, Hunan, Hubei, Shanxi, Henan, and Liaoning provinces. The double-banded yellow horsefly (Atylotus bivittateinus) is particularly prevalent in Northeast, North, and East China. There is no single recognized dao di (terroir) region for this insect-based medicinal, as horseflies are found wherever large livestock are kept in warm, well-vegetated areas.

Quality indicators

Good quality Meng Chong consists of whole, intact dried insect bodies that are large in size and free of debris or foreign matter. The dried specimens should be elongated-oval in shape, approximately 1.3–2.0 cm long and 5–10 mm wide. The head is black-brown, the thorax is dark brown with a shiny shell-like dorsal surface, and the wings should extend beyond the abdomen. The abdomen is brownish-yellow with six visible body segments and may show white markings. The texture should be loose and brittle, breaking easily. It has a characteristic foul, pungent odor and a bitter, salty taste. Avoid specimens that are heavily fragmented, have lost most appendages, or show signs of mold or insect damage.

Classical Texts

Key passages from the classical Chinese medical texts that describe Meng Chong and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: 蜚虻，味苦微寒。主逐瘀血，破下血积坚癖症瘕寒热，通利血脉及九窍。生川谷。

Translation: Fei Meng (gadfly), bitter in taste and slightly cold. It primarily expels stagnant Blood, breaks up Blood accumulations, hardened masses, and abdominal lumps with alternating chills and fever, and opens the Blood vessels and the nine orifices. It grows in river valleys.

Ming Yi Bie Lu (《名医别录》)

Original: 主女子月水不通，积聚，除贼血在胸腹五脏者，及喉痹结塞。

Translation: It treats women's blocked menstruation and accumulations, removes pathological Blood lodged in the chest, abdomen, and five Zang organs, and treats throat blockage and obstruction.

Ben Cao Gang Mu (《本草纲目》), citing Cheng Wuji

Original: 苦走血，血结不行者，以苦攻之，故治蓄血用虻虫，乃肝经血分药也，古方多用，今人稀使。

Translation: Bitterness moves the Blood. When Blood is congealed and will not move, one uses bitter substances to attack it. Therefore Meng Chong is used for retained Blood. It is a medicinal for the Blood level of the Liver channel. Ancient formulas used it frequently, but people today rarely employ it.

Ben Cao Jing Shu (《本草经疏》)

Original: 蜚虻，其用大略与蟅虫相似，而此则苦胜，苦能泄结……今人以其有毒多不用，然仲景抵当汤、丸，大黄蟅虫丸中咸入之，以其散脏腑宿血结积有效也。

Translation: The gadfly's uses are broadly similar to those of Tu Bie Chong (ground beetle), but the gadfly is more intensely bitter, and bitterness can drain accumulations... People today mostly avoid it because it is toxic, yet Zhang Zhongjing included it in both Di Dang Tang and Di Dang Wan, as well as Da Huang Zhe Chong Wan, because it is effective at dispersing long-standing Blood stasis in the organs.

Historical Context

The history and evolution of Meng Chong's use in Chinese medicine over the centuries

Meng Chong has a long history in Chinese medicine, first recorded in the Shen Nong Ben Cao Jing (circa Han Dynasty) under the name Fei Meng (蜚虻). The character 虻 (meng) refers to the horsefly or gadfly, an insect notorious for biting cattle and horses. Its medical use was inspired by the observation that these flies pierce tough animal hides and draw blood with great force, a natural behavior that classical physicians interpreted as reflecting a powerful ability to break through Blood stagnation in the human body.

Zhang Zhongjing (circa 150–219 CE) was the most famous early advocate of Meng Chong, employing it in several important formulas in the Shang Han Lun and Jin Gui Yao Lue. His Di Dang Tang (Resistance Decoction) combines Meng Chong with Shui Zhi (leech), Tao Ren (peach kernel), and Da Huang (rhubarb) to treat severe lower abdominal Blood stasis with mental disturbance. He also included it in Da Huang Zhe Chong Wan for chronic Blood stasis with consumptive deficiency. Despite these famous classical applications, the Ben Cao Gang Mu notes that by the Ming Dynasty, practitioners had become cautious about using it due to its toxicity, and it had fallen into relative disuse compared to earlier periods.

Among the insect-based Blood-breaking medicines, Meng Chong is traditionally considered the most potent, followed by Shui Zhi (leech) and then Tu Bie Chong (ground beetle). The Ben Cao Jing Feng Yuan made a notable clinical observation that despite its fierce Blood-breaking power, Meng Chong's action is relatively 'moderate' in pace, meaning it works steadily rather than in a single violent purge, which allowed practitioners to combine it with Blood-nourishing herbs to break stasis without excessively damaging healthy Blood.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Meng Chong

1

Purification and Characterization of Anticoagulant Protein from Tabanus bivittatus (Protein Biochemistry Study, 2006)

Ahn MY, Hahn BS, Lee PJ, et al. Archives of Pharmacal Research, 2006, 29: 418-423.

Researchers isolated a 65 kDa anticoagulant protein (TAP) from the whole body of Tabanus bivittatus. TAP significantly prolonged human plasma clotting time, particularly activated partial thromboplastin time, in a dose-dependent manner. It showed potent and specific antithrombin activity but did not inhibit factor Xa, suggesting it works primarily by blocking thrombin. This supports the traditional use of Meng Chong for breaking Blood stasis.

Link
2

Identification of Anticoagulant Activities in Salivary Gland Extracts of Four Horsefly Species (In Vitro Study, 2001)

Kazimírová M, Šulanová M, Kozánek M, et al. Pathophysiology of Haemostasis and Thrombosis, 2001, 31(3-6): 294-305.

Salivary gland extracts from four species of horseflies (Tabanidae) were tested for anticoagulant activity. All extracts prolonged human plasma clotting time in a dose-dependent manner and inhibited thrombin activity, but did not inhibit factor Xa. This confirmed that horsefly species contain potent thrombin-inhibiting compounds, providing pharmacological support for the Blood-moving properties attributed to Meng Chong.

Link
3

A Novel Family of RGD-containing Disintegrins (Tablysin-15) from Horsefly Tabanus yao Inhibits Platelet Aggregation and Angiogenesis (Preclinical Study, 2011)

Ma D, Xu X, An S, et al. Thrombosis and Haemostasis, 2011, 105(6): 1032-1045.

A novel disintegrin protein called Tablysin-15 was characterized from the salivary glands of Tabanus yao. It displayed high affinity for platelet and endothelial cell integrins, inhibited platelet aggregation induced by collagen, ADP, and convulxin, and also attenuated tube formation in vitro, suggesting potential anti-angiogenic properties in addition to antithrombotic effects.

PubMed
4

A Potent Anti-thrombosis Peptide (Vasotab TY) from Horsefly Salivary Glands (Preclinical Study, 2014)

Xu X, Yang H, Ma D, et al. Peptides, 2014, 60: 29-35.

A peptide named Vasotab TY was isolated from horsefly salivary glands and found to completely inhibit ADP-induced platelet aggregation at a concentration of 9.6 micrograms per milliliter. This peptide works through glycoprotein IIb/IIIa and also has vasodilatory activity, demonstrating a dual mechanism relevant to the Blood-invigorating action of Meng Chong.

PubMed

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.