Xi Shuai
StarVelarifictorus aspersus (Walker, 1869)
Synonyms: Gryllus aspersus Walker, 1869, Scapsipedus aspersus (Walker), Gryllulus chinensis Weber, Velarifictorus micado (Saussure, 1877)
Also known as: Hsi Shuai · Wade–Giles
Safety at a glance
No rule in our tables for this herb: pregnancy, breastfeeding, incompatible pairs (十八反 / 十九畏), herb–drug, dose ceiling. This is not a safety clearance.
Not graded — No toxicity grade is recorded. Most herbs in the catalogue carry none.
Traditionally used for
- Urinary & fluids
- Energy & fatigue
Cautions & contraindications
- Pregnancy
- Liver conditions
- Allergy risk
- Toxic — professional use only
☯ TCM Properties
Promotes diuresis; Facilitates parturition
Traditional Chinese Uses
Xi Shuai is the dried field cricket Velarifictorus aspersus (Gryllidae), a pungent, salty, warm, and toxic substance traditionally used as a diuretic that enters the Bladder, Small Intestine, and Large Intestine channels. It strongly promotes urination and unblocks obstructed water pathways, and is applied to edema, difficult or dribbling urination, urinary stones and gravel (lin patterns), and ascites, and to help move a stalled labor. Because it is warm, dispersing, and toxic, it is reserved for genuine severe fluid retention or obstruction and is not a casual tonic. It is used in small doses, often powdered, and combined with other diuretic and stone-expelling herbs. It is contraindicated in pregnancy (it promotes delivery) and in weak, deficient patients lacking true obstruction, and should be avoided by anyone with insect or crustacean allergy.
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Botanical Description
Xi Shuai is the dried whole body of the burrowing field cricket Velarifictorus aspersus (Orthoptera: Gryllidae), a nocturnal, burrow-dwelling omnivore widespread across China and East Asia. Adults are about 13-20 mm long, dark reddish-brown to nearly black, with a broad rounded head, long filiform antennae, robust chewing mandibles, and greatly enlarged hind femora for leaping; two long terminal cerci project from the abdomen and the female bears a needle-like ovipositor. Males have leathery, stridulatory forewings that produce the characteristic chirping song. For medicinal use the insects are collected in summer and autumn, killed by scalding in boiling water, then sun-dried or oven-dried whole. Acrid, salty and warm with mild toxicity, the drug promotes urination, breaks Blood stasis and facilitates parturition.
Terrestrial; in burrows, under stones, in field margins, gardens and grassland across warm-temperate to subtropical East Asia.
Active Constituents
Tropomyosin and arginine kinase (arthropod muscle pan-allergens)
ProteinConcentration: Not measured in this species; quantified only in farmed Gryllidae such as Acheta domesticus
These two muscle proteins are the pan-arthropod allergens responsible for IgE cross-reactivity between crustaceans, mites and edible insects, and they are conserved across the Gryllidae. Cricket tropomyosin has been shown to survive a complete simulated gastric and intestinal digestion, unlike shrimp tropomyosin, which may raise rather than lower the allergenic risk of an orally taken cricket preparation. No assay has been performed on Velarifictorus aspersus itself, so their presence in this drug is inferred from the family, not measured. Absence of an assay is not evidence of absence.
⚠ Drug Interactions
Crustacean-derived medicines and supplements (glucosamine sulfate manufactured from shrimp or crab shell, krill oil, chitosan) in shellfish-allergic patients
Shellfish allergy has been shown to be a risk factor for cricket anaphylaxis, and a documented allergic reaction to a commercial insect snack was traced specifically to house cricket tropomyosin. Allergenicity assessment of Acheta domesticus found IgE cross-reactivity with shrimp demonstrable by ELISA, with cricket tropomyosin persisting through simulated digestion. Everything here is established for Acheta domesticus and other farmed crickets rather than for Velarifictorus aspersus, but the allergens involved are conserved muscle proteins and the taxonomic distance within Gryllidae is small.
Clinical note: Take a shellfish and house dust mite allergy history before dispensing any whole-insect drug, and do not dispense Xi Shuai to a patient with crustacean allergy. The reaction is to a conserved protein, so avoiding one cricket species and substituting another gives no protection. This is a whole-insect drug taken as a decoction or powder, so the allergen load is not reduced by processing.
Lou Gu (Gryllotalpa species, mole cricket)
Lou Gu is a separate insect drug from the family Gryllotalpidae with an overlapping indication set, promoting urination and reducing swelling, and it is called mole cricket in English, so English-language sourcing readily conflates the two. Lou Gu has at least some published chemistry, with berberine, palmatine and two Buxus alkaloids identified in methanol extract of Gryllotalpa orientalis; Xi Shuai has none. The drugs are neither botanically nor chemically interchangeable and their traditional dosing differs.
Clinical note: Confirm which insect is being supplied when an order says cricket. If the material is a mole cricket, with the characteristic broad digging forelegs, it is Lou Gu and not Xi Shuai, and it should not be dispensed against a Xi Shuai prescription.
Loop and thiazide diuretics
Xi Shuai is prescribed as a forceful diuretic for urinary blockage, oedema, stones and hepatic ascites, and the traditional character description is acrid, salty, warm and slightly toxic, with the drug contraindicated in pregnancy and in patients of deficient constitution. No pharmacological study of diuresis, toxicity or pharmacokinetics for this species could be located in the indexed literature, so neither the diuretic effect nor the traditional toxicity has been measured. Any additive effect with a prescribed diuretic is therefore hypothetical, and so is any reassurance about safety.
Clinical note: Observe the traditional contraindications, which are the only safety guidance that exists for this drug: avoid in pregnancy and in deficiency patterns. Monitor fluid status and renal function if it is used at all alongside a prescribed diuretic, and prefer better-characterised diuretics where the indication allows.
Dosage Calculator
⚖ Dosage Calculator
A weight-based mathematical estimate for Xi Shuai. Not a prescription.
Evidence Tier
3 studies on recordRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
2
1 verified · 1 unverified
In vitro / animal
1
0 verified · 1 unverified
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Shellfish allergy is a risk factor for cricket anaphylaxis
Clinical report establishing that patients with shellfish allergy are at raised risk of anaphylaxis to cricket. Included here because it is the only body of evidence that bears on the safety of a whole-cricket drug, and because it is the reason a shellfish allergy history is mandatory before dispensing one. The crickets studied were farmed edible species, not Velarifictorus aspersus, on which no allergy study exists.
Allergenicity assessment of the edible cricket Acheta domesticus in terms of thermal and gastrointestinal processing and IgE cross-reactivity with shrimp
Identified tropomyosin as the most relevant IgE-binding protein of Acheta domesticus and demonstrated cross-reactivity with shrimp tropomyosin by ELISA. Cricket tropomyosin withstood the whole simulated digestion process while shrimp tropomyosin showed poor gastric stability, which the authors note may increase the allergenic risk of cricket. Species is Acheta domesticus; the finding is extrapolated to Velarifictorus aspersus only on the basis of shared family and a conserved allergen.
Allergic Reaction to a Commercially Available Insect Snack Caused by House Cricket (Acheta domesticus) Tropomyosin
Case-based molecular workup of an allergic reaction to a commercial insect snack, identifying house cricket tropomyosin as the eliciting allergen. Confirms that the cross-reactivity risk is not theoretical and that it operates at the doses in an ordinary food serving. Again Acheta domesticus rather than the medicinal species.
Historical Texts
Ben Cao Gang Mu (Li Shizhen)
Ming dynasty, 1578Modern Chinese materia medica source listings for xi shuai
Twentieth century to presentThis information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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