Herbsmith Rx Xiao Ke San is a classical Chinese herbal formula recommended by holistic veterinarians to support fluid metabolism, nourish yin, and clear heat in dogs, cats, and horses. Based on the traditional formula Xiao Ke San (also known as Wasting and Thirsting Decoction), it clears lung heat, drains fire, nourishes yin, and generates fluids. It is well suited for pets presenting with xiao ke (wasting and thirsting) patterns characterized by excessive thirst, increased urination, weight loss despite adequate food intake, a dry coat, dry mucous membranes, and a rapid, thin pulse. The formula is structured to address heat and fire in the lung and stomach, yin and blood deficiency, and qi deficiency at the same time. Available as a concentrated powder mixed into food; cats and dogs use the Canine Blend, while horses use the Equine/Horse Blend. Dosing varies by species and body weight, and your authorizing veterinarian will provide specific guidance.
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What It Supports
- Lung heat clearance and fire drainage: Clears heat and drains fire from the lung and stomach, addressing the excess heat that consumes fluids and drives the thirst, dryness, and rapid pulse characteristic of xiao ke patterns in dogs, cats, and horses.
- Yin nourishment: Enriches yin and replenishes the kidney, lung, and stomach yin that are depleted by chronic heat and fire, restoring the body's foundational moisture and reducing the dryness signs associated with yin insufficiency.
- Fluid generation: Generates and restores body fluids consumed by heat and fire, supporting healthy hydration at the tissue level, reducing excessive thirst, and moistening dry mucous membranes and coat.
- Qi and blood support: Tonifies qi and nourishes blood alongside the yin-enriching herbs, addressing the concurrent qi and blood deficiency that develops when chronic heat consumes both fluids and nutritive substances over time.
TCVM Principles
- Primary action: Clears lung and stomach heat, drains fire, and generates fluids to address the xiao ke (wasting and thirsting) pattern, directly targeting the heat excess that drives fluid consumption and the resulting thirst, dryness, and weight loss.
- Secondary action: Nourishes yin, tonifies qi, and moves blood to address the deficiency components of the pattern, ensuring the formula supports recovery of both the yin substance and the qi needed to transform and distribute fluids throughout the body.
Available Forms
- Powder - Canine Blend (for dogs and cats): Available in 75 g, 150 g, 500 g, 900 g, and 1200 g sizes; mix into food at the recommended dose for your pet's weight. Cats and dogs both use this blend.
- Powder - Equine/Horse Blend (for horses only): Available in 150 g, 500 g, 900 g, and 1200 g sizes; mix into grain at the recommended dose for your horse.
Suggested Use
For Dogs (Canine Blend Powder):
- Under 30 lbs: ½ tsp twice daily, or as prescribed
- 30-80 lbs: 1 tsp twice daily, or as prescribed
- 80-120 lbs: 1½ tsp twice daily, or as prescribed
- Over 120 lbs: 2 tsp twice daily, or as prescribed
For Cats (Canine Blend Powder): ¼ tsp twice daily, or as prescribed
For Horses (Equine/Horse Blend, 1,000 lb horse): Two tablespoons twice daily for 20 days, then two tablespoons once daily in grain. If the horse initially refuses, start with a small amount mixed into grain and gradually increase until the horse is accustomed to the taste. Most horses will readily accept the herbs in their grain.
Ingredients
Active Ingredients: Tian Hua Fen (Radix Trichosanthis), Mai Men Dong (Radix Ophiopogonis), Wu Wei Zi (Fructus Schisandrae Chinensis), Dang Gui (Radix Angelicae Sinensis), Chuan Xiong (Rhizoma Ligustici Chuanxiong), Sheng Di Huang (Radix Rehmanniae), Shu Di Huang (Radix Rehmanniae Preparata), Bai Shao (Radix Paeoniae Alba), Jie Geng (Radix Platycodi), Huang Qi (Radix Astragali), Dang Shen (Radix Codonopsis), Ge Gen (Radix Puerariae), Huang Lian (Rhizoma Coptidis), Gou Qi Zi (Fructus Lycii), Ju Hua (Flos Chrysanthemi), Deng Xin Cao (Medulla Junci), Gan Cao (Radix Glycyrrhizae)
Inactive Ingredient: Flaxseed
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Active Ingredient TCVM Actions
Xiao Ke San is a 17-herb formula that comprehensively addresses the xiao ke (wasting and thirsting) pattern by clearing heat and fire, nourishing yin and blood, tonifying qi, generating fluids, and moving blood to prevent stagnation as the yin and fluids are rebuilt:
- Tian Hua Fen (Radix Trichosanthis) - Trichosanthes Root: Principal herb; clears heat, drains fire, generates fluids, and relieves thirst; one of the primary herbs for xiao ke patterns, directly addressing the lung and stomach heat that consumes fluids and drives the wasting and thirsting presentation.
- Mai Men Dong (Radix Ophiopogonis) - Ophiopogon Root: Nourishes stomach and lung yin, generates fluids, and clears deficiency heat; restores the yin fluids depleted by heat in the lung and stomach, reducing thirst and moistening dry mucous membranes and coat.
- Wu Wei Zi (Fructus Schisandrae Chinensis) - Schisandra Berry: Astringes the lung, generates fluids, and stops excessive fluid loss; restrains the leakage of fluids and qi caused by the heat pattern, helping to retain the fluids that the other herbs are rebuilding.
- Dang Gui (Radix Angelicae Sinensis) - Dong Quai Root: Tonifies and invigorates the blood, moistens the intestines; nourishes the blood that is often depleted alongside yin in xiao ke patterns, ensuring the yin-nourishing herbs have a blood foundation to work with.
- Chuan Xiong (Rhizoma Ligustici Chuanxiong) - Sichuan Lovage Root: Invigorates blood and moves qi; prevents blood stagnation from developing as the formula rebuilds yin and fluids, and ensures qi and blood remain freely circulating throughout the recovery process.
- Sheng Di Huang (Radix Rehmanniae) - Raw Rehmannia Root: Strongly nourishes yin and blood, cools the blood, and generates fluids; addresses the kidney and liver yin deficiency underlying the xiao ke pattern and cools the blood-level heat that accompanies chronic fluid consumption.
- Shu Di Huang (Radix Rehmanniae Preparata) - Prepared Rehmannia Root: Deeply nourishes kidney yin and essence, tonifies the blood; works with Sheng Di Huang to powerfully rebuild the kidney and liver yin and essence depleted by the chronic heat and wasting pattern.
- Bai Shao (Radix Paeoniae Alba) - White Peony Root: Nourishes blood and yin, softens the liver, and astringes; supports the blood and yin nourishment provided by the Rehmannia herbs and moderates the liver's role in the pattern.
- Jie Geng (Radix Platycodi) - Platycodon Root: Opens the lung qi, expels phlegm, and acts as an envoy herb directing the formula to the lung; supports the lung's dispersing function and guides the heat-clearing herbs to the lung to address the upper burner component of the xiao ke pattern.
- Huang Qi (Radix Astragali) - Astragalus Root: Tonifies the spleen and lung qi, stabilizes the exterior, and promotes fluid metabolism; addresses the qi deficiency that impairs the body's ability to transform and distribute fluids, supporting recovery of normal fluid metabolism in the spleen and lung.
- Dang Shen (Radix Codonopsis) - Codonopsis Root: Tonifies the spleen and lung qi, nourishes the blood; works with Huang Qi to strengthen the middle burner's role in generating qi, blood, and fluids, ensuring the formula's yin-nourishing herbs are supported by adequate qi transformation.
- Ge Gen (Radix Puerariae) - Kudzu Root: Generates fluids, relieves thirst, clears heat, and raises the clear yang of the stomach and spleen; a key herb for xiao ke patterns, directly addressing thirst and dryness while supporting the spleen and stomach's fluid-generating functions.
- Huang Lian (Rhizoma Coptidis) - Coptis Rhizome: Strongly clears heat and drains fire from the heart and stomach; addresses the fire excess that drives the middle burner xiao ke pattern and complements Tian Hua Fen's action in clearing lung and stomach heat toxicity.
- Gou Qi Zi (Fructus Lycii) - Goji Berry: Nourishes liver and kidney yin and blood, brightens the eyes; supports the yin and blood foundation being rebuilt by the Rehmannia herbs and addresses the visual and systemic yin deficiency signs that accompany chronic xiao ke patterns.
- Ju Hua (Flos Chrysanthemi) - Chrysanthemum Flower: Clears liver heat, brightens the eyes, and disperses wind-heat; addresses the liver heat and eye-related signs that often accompany liver and kidney yin deficiency in xiao ke patterns, working with Gou Qi Zi as a classic liver-eye pair.
- Deng Xin Cao (Medulla Junci) - Rush Pith: Clears heart heat, promotes urination, and drains heat downward through the urine; creates an additional exit route for heat in the heart and small intestine channel, reducing the heat burden that contributes to fluid consumption and thirst.
- Gan Cao (Radix Glycyrrhizae) - Licorice Root: Tonifies the spleen qi, clears heat, resolves toxicity, and harmonizes the formula; moderates the actions of the other herbs and supports the middle burner's role in generating and distributing fluids.
Potential Drug Interactions
Xiao Ke San contains a broad combination of yin-nourishing, qi-tonifying, heat-clearing, and blood-moving herbs including Huang Qi, Dang Shen, Huang Lian, Sheng Di Huang, Shu Di Huang, and Dang Gui, which have significant effects on glucose metabolism, blood viscosity, and hormonal regulation. Pets currently on prescription medications, particularly those being treated for diabetes or endocrine conditions, should use this formula under veterinary supervision, as herb-drug interaction research in dogs and cats remains limited.
Medication categories warranting extra caution include hypoglycemic or insulin therapies, anticoagulant or antiplatelet medications, hormonal therapies, immunosuppressive drugs, and pets managing multiple concurrent prescriptions. Your authorizing veterinarian can determine appropriateness based on your pet's condition, current medications, and laboratory results.
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Frequently Asked Questions
What conditions is Xiao Ke San used for in TCVM?
In Traditional Chinese Veterinary Medicine, Xiao Ke San is indicated for the xiao ke (wasting and thirsting) pattern, presenting as excessive thirst, increased urination, weight loss despite adequate food intake, dry coat, dry mucous membranes, and a rapid thin pulse. Also known as Wasting and Thirsting Decoction, it is appropriate for pets with complex presentations involving lung and stomach heat, yin and blood deficiency, and qi deficiency simultaneously, and is often considered for pets with endocrine-related conditions where TCVM pattern matching supports its use.
How is Xiao Ke San administered to dogs, cats, and horses?
Mix the powder directly into food or grain at the dose recommended for your pet's species and body weight. Both dogs and cats use the Canine Blend; horses use the Equine/Horse Blend. Dogs and cats receive the formula twice daily; horses receive two tablespoons twice daily for the first 20 days, then once daily for maintenance. Your authorizing veterinarian will confirm the appropriate dose and schedule for your individual pet.
How long does it take to see results with Xiao Ke San?
As a formula addressing a constitutional deficiency pattern with concurrent heat excess, Xiao Ke San works gradually over time. Many pets show improvement in thirst, urination, coat moisture, and energy levels within 4 to 8 weeks of consistent use. Chronic or deeply established xiao ke patterns may require a longer course of treatment, and your veterinarian may recommend periodic reassessment including laboratory monitoring to track your pet's response and adjust the formula or dosing accordingly.
Can Xiao Ke San be combined with other TCVM formulas or conventional medications?
Combination with complementary TCVM formulas is common in holistic veterinary practice and should be guided by your authorizing veterinarian based on your pet's full pattern diagnosis. Because this formula contains herbs with known effects on glucose metabolism, including Huang Qi, Ge Gen, and Huang Lian, veterinary oversight is especially important if your pet is on insulin or hypoglycemic medications, to prevent additive effects and ensure blood glucose is monitored appropriately throughout treatment.