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Herbsmith Rx Si Jun Zi Tang is the classical foundational Chinese herbal formula for qi tonification, recommended by holistic veterinarians to tonify the qi and strengthen the spleen in dogs, cats, and horses. Comparable to Four Gentlemen Powder and Wei Qi Booster, it tonifies the qi and strengthens the spleen, addressing spleen qi vacuity. The foundational qi-tonifying base formula from which many important TCVM formulas are derived, including Liu Jun Zi Tang (with added dampness-resolving herbs) and Ba Zhen Tang (combined with Si Wu San for simultaneous qi and blood tonification). Well suited for pets and horses presenting with spleen qi deficiency, with signs such as fatigue and low energy, reduced appetite, soft or loose stool, muscle weakness or atrophy, a pale tongue, and the general signs of insufficient qi failing to power the spleen's transformation and transportation functions and the body's overall vitality and immune response. 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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For Dogs (Canine Blend Powder):
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.
Active Ingredients: Ren Shen (Radix Ginseng), Bai Zhu (Rhizoma Atractylodis Macrocephalae), Fu Ling (Sclerotium Poriae Cocos), Zhi Gan Cao (Honey-fried Radix Glycyrrhizae Uralensis)
Inactive Ingredient: Flaxseed
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Si Jun Zi Tang is the classical four-herb foundational qi tonification formula of Chinese medicine, combining a principal yuan qi and spleen qi tonic, a spleen-strengthening and dampness-drying herb, a spleen-strengthening and dampness-leaching herb, and a harmonizing and tonic moderator to tonify the qi and strengthen the spleen from four complementary angles:
Si Jun Zi Tang contains Ren Shen (ginseng), which has known effects on platelet aggregation, blood glucose regulation, and certain hepatic enzyme pathways, and Zhi Gan Cao (licorice), which can affect cortisol metabolism and potassium levels with prolonged use. Pets on anticoagulant, antidiabetic, immunosuppressive, or corticosteroid medications should use this formula under veterinary supervision, as Ren Shen's mild platelet-affecting and blood glucose-modulating properties may have additive or counteracting effects with pharmaceutical agents in those categories, and herb-drug interaction research in dogs, cats, and horses remains limited.
Medication categories warranting extra caution include anticoagulant or antiplatelet medications, antidiabetic medications and insulin, corticosteroids and immunosuppressive drugs, diuretics and cardiac medications where Zhi Gan Cao's potassium effects may be relevant, and antihypertensive medications where Ren Shen's adaptogenic effects on blood pressure may interact. Your authorizing veterinarian can determine appropriateness based on your animal's condition, current medications, and laboratory results.
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In Traditional Chinese Veterinary Medicine, Si Jun Zi Tang is indicated for spleen qi vacuity, presenting with fatigue and low energy, reduced appetite, soft or loose stool, muscle weakness or atrophy, poor body condition, and the general signs of insufficient qi failing to power the spleen's transformation and transportation functions and the body's overall vitality. Comparable to Four Gentlemen Powder and Wei Qi Booster, it is the foundational qi tonification formula from which many important TCVM formulas are derived, including Liu Jun Zi Tang, which adds dampness-resolving herbs for spleen qi deficiency with concurrent phlegm and dampness, and Ba Zhen Tang, which combines Si Jun Zi Tang with Si Wu San to address simultaneous qi and blood deficiency.
Mix the powder directly into food or grain at the dose recommended for your animal's species and body weight. 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. 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. Your authorizing veterinarian will confirm the appropriate dose and schedule for your individual animal.
Many pets show improvement in energy, appetite, and stool consistency within 3 to 6 weeks of consistent use as the spleen qi is tonified and the spleen's transformation and transportation functions are restored. Because spleen qi deficiency is typically a chronic deficiency pattern that has developed gradually over time, a longer course of treatment of 8 to 12 weeks or more is often needed to adequately restore the qi and maintain improvement in vitality, digestive function, and muscle condition. Your veterinarian may recommend periodic reassessment to evaluate the pattern's response and adjust the treatment plan as the spleen qi is gradually rebuilt.
Si Jun Zi Tang is the foundational four-herb qi tonification formula from which many related TCVM formulas are derived. Liu Jun Zi Tang adds Chen Pi and Ban Xia to the Si Jun Zi Tang base to address concurrent phlegm and dampness accumulation alongside the spleen qi deficiency. Ba Zhen Tang combines Si Jun Zi Tang with the four blood-nourishing herbs of Si Wu San to address simultaneous qi and blood deficiency. Shi Quan Da Bu Tang adds qi- and yang-warming herbs to the Ba Zhen Tang base for more severe combined deficiency patterns. Your authorizing veterinarian will determine which qi-tonifying formula best matches your animal's full TCVM pattern diagnosis based on whether the qi deficiency is accompanied by dampness, blood deficiency, yang deficiency, or other concurrent patterns.
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