Herbsmith Rx Di Tan San is a classical Chinese herbal formula recommended by holistic veterinarians to clear phlegm, open the orifices, and tonify qi in dogs, cats, and horses. Also known as Scour Phlegm Powder, this nine-herb formula addresses the TCVM pattern of phlegm obstructing and misting the heart orifices, the mechanism responsible for the neurological and cognitive presentations that arise when accumulated phlegm obstructs the clear orifices of the heart and brain: seizures, sudden collapse or loss of consciousness, altered mentation, ataxia, vertigo, behavioral changes, and cognitive clouding from phlegm blocking the clear yang from ascending to the head and the heart spirit from expressing clearly. Di Tan San is built on the Er Chen San foundation (Ban Xia, Ju Hong, Fu Ling) and extends it with four additional herbs that dramatically amplify the phlegm-dissolving and orifice-opening strategy: Dan Nan Xing (bile-processed arisaema, the signature phlegm-wind dissolving and orifice-opening herb), Shi Chang Pu (the classical aromatic orifice-opener that directly opens the heart orifices blocked by phlegm), Zhu Ru (bamboo shavings that cool phlegm-heat and harmonize the stomach to stop phlegm generation from the middle jiao), and Zhi Shi (immature bitter orange that strongly descends qi and breaks up phlegm accumulations in the channels and orifices). Ren Shen tonifies the yuan qi to support the formula's intensive phlegm-scouring action, and Gan Cao harmonizes the formula's herbs. Di Tan San treats phlegm obstruction of the orifices at a level of severity and neurological depth that the base Er Chen San formula cannot reach, making it the appropriate choice when phlegm accumulation has progressed to the point of obstructing consciousness, generating wind-phlegm movement disorders, or producing the sudden and episodic neurological presentations characteristic of phlegm misting the heart and generating liver wind. Well suited for dogs, cats, and horses presenting with phlegm obstructing the heart orifices and generating internal wind, characterized by episodic or sudden altered consciousness, seizure activity, or collapse from phlegm-wind obstruction; ataxia, incoordination, or abnormal gait from phlegm obstructing the clear yang's ascent and generating wind in the channels; cognitive clouding, altered behavior, or unresponsiveness from phlegm misting the heart spirit; vertigo and head-shaking from phlegm-wind obstructing the channels of the head; a pale or dusky tongue with a white or yellow greasy coating reflecting the phlegm accumulation; and a slippery or wiry-slippery pulse reflecting the phlegm and phlegm-wind. 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.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
What It Supports
- Phlegm scouring and orifice opening through Dan Nan Xing as the signature phlegm-wind dissolving and orifice-opening herb extending the formula's phlegm-transforming action to the neurological level: Scours out entrenched phlegm and opens the heart orifices through Dan Nan Xing (bile-processed arisaema powder, Pulvis Arisaemae cum Felle Bovis), the formula's most potent phlegm-dissolving and orifice-opening herb and the key ingredient that distinguishes Di Tan San from the base Er Chen San strategy. Dan Nan Xing is Tian Nan Xing (Arisaema rhizome, jack-in-the-pulpit) processed with bovine bile (niu dan, ox bile), a processing method that adds the bile's cold, bitter, phlegm-heat-clearing, and liver-wind-calming action to Nan Xing's inherently powerful phlegm-dissolving and wind-phlegm-dispersing properties. Bile processing converts Nan Xing's warm, drying, strongly irritant nature into a cold-natured, bitter, phlegm-heat-clearing, liver-wind-calming action that specifically targets the phlegm-wind and phlegm-heat patterns responsible for the neurological presentations Di Tan San treats. Dan Nan Xing reaches phlegm lodged at deeper channel levels than Ban Xia can access, dissolving phlegm accumulated in the orifices, channels, and collaterals of the head and brain, and its liver-wind-calming action addresses the wind component of the phlegm-wind pattern responsible for seizure and movement-disorder presentations. Raw Nan Xing is toxic; only the bile-processed form (Dan Nan Xing) is used clinically. Dan Nan Xing's strong bioactive alkaloid content warrants veterinary oversight and may interact with anesthetic and neuromuscular medications; veterinary review is required.
- Aromatic orifice opening and heart spirit clearing through Shi Chang Pu directly unblocking the heart orifices from phlegm obstruction and restoring clear communication between the heart spirit and the sensory and cognitive orifices: Opens the heart orifices, transforms turbid phlegm, and promotes the ascent of clear yang to the orifices of the head through Shi Chang Pu (sweetflag rhizome, Rhizoma Acori Graminei), the classical aromatic orifice-opening herb that acts directly on the phlegm obstruction blocking the heart and sensory orifices. Shi Chang Pu's acrid, aromatic, and warm nature penetrates the phlegm obstruction in the orifices and channels of the heart and head, dispersing the phlegm-damp and turbid yin that is blocking the heart spirit, disrupting clear consciousness, and obstructing the ascending clear yang that maintains alertness and sensory clarity. In TCVM, the heart houses the shen (spirit/consciousness), and when phlegm accumulates and obstructs the heart's orifices, the shen cannot express clearly, generating the altered mentation, cognitive clouding, behavioral change, and loss of consciousness that characterize the phlegm-misting-the-orifices pattern. Shi Chang Pu's specific action of opening the heart orifices and dispersing the turbid phlegm that blocks the shen makes it the essential orifice-opening herb in Di Tan San; it is the herb that directly addresses the consciousness-obstructing dimension of the phlegm pattern that Dan Nan Xing's phlegm-dissolving action exposes by breaking up the phlegm accumulation. Shi Chang Pu has mild interaction potential with sedative medications and anesthetic agents through its aromatic volatile oil content; veterinary monitoring is warranted in animals on these medications.
- Qi descending and phlegm breaking through Zhi Shi strongly moving the qi downward to break up phlegm accumulations and drive phlegm out of the orifices and channels where it has lodged: Strongly descends the qi, breaks up phlegm accumulations, and resolves food stagnation through Zhi Shi (immature bitter orange fruit, Fructus Immaturus Citri Aurantii), the forceful qi-descending herb that addresses the qi stagnation component of the phlegm obstruction pattern. In TCVM phlegm pathology, phlegm accumulates and becomes entrenched in the orifices and channels when qi stagnates and loses its ability to move phlegm out of the channels and downward through the body's normal phlegm-resolving pathways. Zhi Shi's strong downward qi-moving and phlegm-breaking action reverses this stagnation by forcefully descending the qi in the chest, middle jiao, and channels, breaking up consolidated phlegm masses that have accumulated and hardened in the orifices, and opening the qi movement pathways that allow Dan Nan Xing and Shi Chang Pu's orifice-opening action to take effect. Zhi Shi also breaks up food stagnation in the middle jiao, addressing any digestive phlegm-generating component of the pattern. Zhi Shi has interaction potential with CYP3A4-metabolized medications through its furanocoumarin content (bergapten and related compounds); veterinary review is warranted in animals on narrow-therapeutic-index CYP3A4 medications including cyclosporine and tacrolimus.
- Phlegm-heat cooling and stomach harmonizing through Zhu Ru clearing phlegm-heat from the stomach and lung channels and stopping phlegm production at the middle jiao source: Clears phlegm-heat, cools the stomach, and stops vomiting and nausea from phlegm-heat obstructing the middle jiao through Zhu Ru (bamboo shavings, Caulis Bambusae in Taeniis), the phlegm-heat-clearing and stomach-harmonizing herb that addresses the heat component of the phlegm pattern and prevents new phlegm generation from middle jiao heat. When phlegm accumulation generates heat (phlegm stagnating in the channels generates secondary heat from the obstruction), the phlegm-heat combination becomes more tenacious and difficult to dissolve than cold phlegm alone, and the middle jiao heat accelerates phlegm production from the stomach and lung channels. Zhu Ru's cold, sweet nature clears this phlegm-heat from the stomach and lung, cools the middle jiao to stop new phlegm generation from heat, and harmonizes the stomach qi to prevent the rebellious stomach qi that phlegm-heat obstruction generates. Zhu Ru's cooling action also complements Dan Nan Xing's bile-processed cold nature in addressing the heat dimension of phlegm-wind, preventing the formula's warming phlegm-drying herbs (Ban Xia, Ju Hong) from excessively warming the pattern and worsening any heat component. Zhu Ru is generally well tolerated with minimal drug interactions.
- Er Chen San base phlegm transformation and dampness drying through Ban Xia, Ju Hong, and Fu Ling providing the foundational phlegm-transforming and spleen-supporting action on which Di Tan San's stronger orifice-opening strategy is built: Transforms phlegm, dries dampness, regulates the qi, and strengthens the spleen through the Er Chen San core of Ban Xia, Ju Hong, and Fu Ling, the foundational phlegm-transforming strategy that underlies Di Tan San's more intensive orifice-opening approach. Ban Xia (processed pinellia rhizome) dries dampness and transforms phlegm at the spleen and stomach level, addressing the phlegm-damp substrate from which the more severe phlegm-wind and phlegm-orifice-obstructing patterns develop. Ju Hong (red tangerine peel) regulates the qi and assists phlegm transformation through its acrid aromatic qi-moving action, preventing phlegm re-accumulation from qi stagnation and assisting the stronger qi-moving action of Zhi Shi. Fu Ling strengthens the spleen and drains dampness, addressing the spleen qi vacuity root cause of the dampness accumulation that generates and sustains the phlegm pattern. The Er Chen San base ensures that Di Tan San's intensive orifice-opening strategy is supported by the fundamental phlegm-transforming and spleen-strengthening action needed to clear the phlegm substrate that the orifice-opening herbs expose and dissolve.
- Qi tonification and formula harmonization through Ren Shen and Gan Cao supporting the yuan qi during the formula's intensive phlegm-scouring action and coordinating the formula's nine herbs into a therapeutically coherent whole: Tonifies the yuan qi and harmonizes the formula through Ren Shen (ginseng root) and Gan Cao (raw licorice root), the tonifying and harmonizing pair that prevents the formula's intensive phlegm-scouring and orifice-opening action from depleting the righteous qi and ensures the formula's nine herbs work as a coordinated therapeutic whole. Di Tan San's phlegm-scouring strategy requires substantial qi to drive the phlegm out of the deep orifices and channels where it has lodged; Ren Shen's yuan qi tonification provides this foundation, preventing the phlegm-dissolving herbs from depleting the qi as they work. The formula uses raw Gan Cao (not honey-fried Zhi Gan Cao), providing harmonizing and modest spleen qi support with a slightly more clearing and moderating action than the warming, tonifying Zhi Gan Cao would provide.
TCVM Principles
- Primary action - phlegm misting the heart orifices and generating wind-phlegm through the Er Chen San base extended by Dan Nan Xing, Shi Chang Pu, Zhi Shi, and Zhu Ru into a formula capable of reaching the neurological and consciousness-obstructing presentations that the base phlegm-transforming strategy cannot address: Addresses the phlegm-misting-the-orifices pattern and the wind-phlegm pattern responsible for the neurological and cognitive presentations that arise when phlegm accumulation reaches the orifices of the heart and the channels of the head and brain. In TCVM pathophysiology, phlegm is first generated by spleen qi vacuity, allowing fluid to accumulate and congeal (the Er Chen San pattern); when this phlegm accumulation persists and deepens, it can move upward along the liver and gallbladder channels to obstruct the orifices of the head and heart, generating the phlegm-misting-the-orifices pattern that manifests as altered consciousness and cognitive signs. When accumulated phlegm combines with liver wind (arising from liver yin vacuity, liver fire, or phlegm obstruction generating internal wind), the phlegm-wind combination generates seizure, movement disorder, and sudden neurological onset presentations characteristic of wind-phlegm. Di Tan San addresses both the phlegm substrate (through the Er Chen San base) and the neurological depth of the phlegm obstruction (through Dan Nan Xing's phlegm-wind dissolving, Shi Chang Pu's orifice-opening, Zhi Shi's phlegm-breaking qi descension, and Zhu Ru's phlegm-heat clearing), making it the appropriate formula when the phlegm pattern has progressed to generating neurological or consciousness-obstructing manifestations.
- Secondary action - Di Tan San as a derived formula from the Er Chen San phlegm-treatment tradition, demonstrating the classical strategy of extending the base phlegm-transforming formula to address the more severe and neurologically significant phlegm presentations through the addition of targeted orifice-opening and phlegm-wind dissolving herbs: Di Tan San's relationship to Er Chen San reflects the same formula-building strategy as Wen Dan Tang (adding phlegm-heat herbs to the Er Chen base for phlegm-heat disturbing the spirit) and Qing Qi Hua Tan Wan (adding lung heat-clearing herbs for phlegm-heat in the lung) - the Er Chen San core is preserved and extended with additional herbs that direct the base phlegm-transforming strategy to the specific pathogenic factor or tissue location requiring treatment. Di Tan San's additions (Dan Nan Xing, Shi Chang Pu, Zhi Shi, Zhu Ru) are specifically selected for their orifice-opening, phlegm-wind dissolving, and neurological-level phlegm-clearing actions, reflecting the classical TCVM formulation principle that the severity and location of the phlegm pattern determines which herbs are added to the Er Chen San base. The pattern hierarchy for phlegm formula selection from the Er Chen San tradition is: Er Chen San for basic phlegm-damp; Wen Dan Tang for phlegm-heat disturbing the gallbladder and heart spirit; Di Tan Tang and Di Tan San for phlegm misting the orifices and wind-phlegm; and Da Di Tan Tang (with stronger wind-dissolving and orifice-opening herbs) for the most severe wind-phlegm stroke presentations.
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: Ban Xia (Rhizoma Pinelliae Ternatae), Ju Hong (Pericarpium Citri Erythrocarpae), Fu Ling (Sclerotium Poriae Cocos), Zhi Shi (Fructus Immaturus Citri Aurantii), Zhu Ru (Caulis Bambusae in Taeniis), Dan Nan Xing (Pulvis Arisaemae cum Felle Bovis), Shi Chang Pu (Rhizoma Acori Graminei), Ren Shen (Radix Ginseng), Gan Cao (Radix Glycyrrhizae Uralensis)
Inactive Ingredient: Flaxseed
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Active Ingredient TCVM Actions
Di Tan San is a nine-herb formula built on the Er Chen San phlegm-transforming base (Ban Xia, Ju Hong, Fu Ling) and extended with four orifice-opening and phlegm-wind-dissolving herbs (Dan Nan Xing, Shi Chang Pu, Zhi Shi, Zhu Ru) plus a qi-tonifying and harmonizing pair (Ren Shen, Gan Cao) to address phlegm misting the heart orifices and phlegm-wind at the neurological level:
- Dan Nan Xing (Pulvis Arisaemae cum Felle Bovis) - Bile-processed Arisaema / Jack-in-the-Pulpit with Bovine Bile: Dissolves phlegm-wind and phlegm-heat, opens the orifices, calms liver wind, and clears heat from the lung and heart channels; the signature phlegm-wind dissolving herb that defines Di Tan San's neurological indication and is the most potent phlegm-wind and orifice-obstructing phlegm-clearing herb in the classical materia medica. Dan Nan Xing is Tian Nan Xing (Arisaema rhizome) processed with bovine bile (ox bile), which transforms the raw herb's warm, toxic, strongly drying nature into a cold, bitter, phlegm-heat-clearing and liver-wind-calming action targeted specifically at phlegm-wind, phlegm misting the orifices, and phlegm-heat obstructing the heart and brain channels. Raw Tian Nan Xing is toxic and never used clinically without processing; Dan Nan Xing's bile processing eliminates the raw toxicity and adds the ox bile's distinct therapeutic properties. Dan Nan Xing is indicated specifically for phlegm-wind patterns involving seizures, altered consciousness, and neurological presentations, and should not be used for cold phlegm patterns (where warm, drying Ban Xia-based formulas are appropriate) or yin vacuity phlegm. Dan Nan Xing has strong bioactive alkaloid content and requires veterinary oversight; interactions with anesthetic agents, neuromuscular blocking agents, and antiepileptic medications warrant a comprehensive veterinary medication review.
- Shi Chang Pu (Rhizoma Acori Graminei) - Sweetflag Rhizome / Stone Calamus / Acorus Rhizome: Opens the heart orifices, transforms turbid phlegm-damp, promotes the ascent of clear yang to the orifices, and calms the spirit obstructed by phlegm; the classical aromatic orifice-opening herb that directly addresses the consciousness-obstructing dimension of the phlegm-misting-the-orifices pattern. Shi Chang Pu's acrid, aromatic, warm, and penetrating nature disperses the turbid phlegm-damp obstructing the heart's orifices, allowing the heart spirit to express clearly, restoring the clear yang's ascent to the sensory and cognitive orifices of the head, and opening the channel pathways that phlegm obstruction has blocked. Shi Chang Pu is found in virtually every classical formula for phlegm misting the orifices and is considered the essential orifice-opening herb of the TCVM materia medica for this pattern. Shi Chang Pu contains beta-asarone and related aromatic volatile oils that contribute to its orifice-opening action; beta-asarone has mild CNS-modulating effects and interaction potential with sedative, anesthetic, and antiepileptic medications. Veterinary monitoring is warranted in animals on these medications.
- Zhi Shi (Fructus Immaturus Citri Aurantii) - Immature Bitter Orange Fruit / Unripe Bitter Orange: Strongly descends the qi, breaks up phlegm and food accumulations, and opens obstructions in the chest and abdomen; the forceful qi-descending herb that reverses the qi stagnation allowing phlegm to accumulate and lodge in the channels and orifices, driving phlegm downward and out of the locations where it has consolidated. Zhi Shi's bitter, acrid, and cool nature makes it significantly more forceful than Chen Pi or Ju Hong in moving the qi and breaking phlegm accumulations; its action in Di Tan San is to create the downward qi movement that carries Dan Nan Xing and Shi Chang Pu's phlegm-dissolving action through the channels and orifices and drives the dissolved phlegm out through the body's normal elimination pathways. Zhi Shi contains furanocoumarin compounds (bergapten and related) with CYP3A4 inhibitory potential; veterinary review is warranted in animals on cyclosporine, tacrolimus, statins, and other narrow-therapeutic-index CYP3A4-metabolized medications.
- Zhu Ru (Caulis Bambusae in Taeniis) - Bamboo Shavings / Bamboo Culm Shavings: Clears phlegm-heat from the lung and stomach channels, cools the stomach, stops vomiting and nausea from phlegm-heat, and clears heat from the heart and chest; the phlegm-heat-clearing and stomach-harmonizing herb that addresses the heat dimension of the phlegm pattern and prevents middle jiao heat from continuously generating new phlegm while the orifice-opening herbs work. Zhu Ru's sweet, cold, phlegm-heat-clearing action specifically targets lung and stomach channel phlegm-heat, working alongside Dan Nan Xing's bile-processed, cold, phlegm-heat-clearing action to address the thermal component of the phlegm-wind pattern at the middle jiao and lung levels. Zhu Ru also prevents the rebellious stomach qi generated by phlegm-heat obstruction, addressing nausea and vomiting that may accompany severe phlegm-orifice obstruction. Zhu Ru is generally well tolerated with minimal drug interactions.
- Ban Xia (Rhizoma Pinelliae Ternatae) - Pinellia Rhizome / Half Summer: Dries dampness, transforms phlegm, descends rebellious stomach qi, and dissipates phlegm nodules; the principal phlegm-transforming herb of the Er Chen San base, providing the foundational dampness-drying and phlegm-transforming action on which Di Tan San's orifice-opening strategy is built. In Di Tan San, Ban Xia addresses the phlegm-damp substrate at the spleen and stomach level, clearing the source of phlegm accumulation that Dan Nan Xing and Shi Chang Pu clear from the orifices. Processed Ban Xia is always used clinically; raw Ban Xia is toxic. Ban Xia has anticholinergic interaction potential, and its warm, drying nature is contraindicated for yin vacuity phlegm and heat bi patterns; veterinary oversight is required.
- Ju Hong (Pericarpium Citri Erythrocarpae) - Red Tangerine Peel / Erythrocarpa Citrus Peel: Regulates the qi, dries dampness, and transforms phlegm through its acrid aromatic qi-moving action; the qi-regulating herb of the Er Chen San base that prevents phlegm re-accumulation from qi stagnation and assists Zhi Shi's stronger qi-descending action in maintaining the downward qi movement that carries phlegm out of the channels and orifices. Ju Hong is generally well tolerated; mild CYP3A4 interaction potential from its flavonoid content at high doses.
- Fu Ling (Sclerotium Poriae Cocos) - Poria / Tuckahoe: Strengthens the spleen, promotes water metabolism, drains dampness, and calms the spirit; the spleen-strengthening and dampness-draining herb of the Er Chen San base that addresses the spleen qi vacuity root cause of the dampness accumulation generating and sustaining the phlegm. Fu Ling's spirit-calming action is particularly relevant in Di Tan San, where phlegm obstruction of the heart orifices disturbs the heart spirit; Fu Ling's heart-nourishing and spirit-calming action gently supports the heart spirit, while Dan Nan Xing and Shi Chang Pu clear the phlegm obstruction blocking it. Fu Ling is generally well tolerated; its water-promoting action warrants monitoring in animals on diuretic medications.
- Ren Shen (Radix Ginseng) - Asian Ginseng Root: Strongly tonifies the yuan qi and spleen qi and generates fluids; the principal qi tonic that provides the constitutional qi support needed for the formula's intensive phlegm-scouring action and prevents the phlegm-dissolving and orifice-opening herbs from depleting the righteous qi as they work through the deep channels and orifices. Ren Shen's yuan qi tonification is especially important in Di Tan San because phlegm misting the orifices is typically a more severe and constitutionally depleting pattern than simple phlegm-damp, and the animal's righteous qi may already be significantly insufficient when the phlegm has progressed to the neurological level. Ren Shen has interaction potential with anticoagulant, stimulant, antidiabetic, and antihypertensive medications; veterinary review is required.
- Gan Cao (Radix Glycyrrhizae Uralensis) - Raw Licorice Root: Harmonizes the formula's herbs, moderates the harsh or conflicting actions of the formula's diverse herbs, and provides modest spleen qi support; the harmonizing envoy that coordinates Di Tan San's nine herbs into a coherent therapeutic strategy. The formula uses raw Gan Cao (not honey-fried Zhi Gan Cao), which provides a slightly more clearing and moderating action than Zhi Gan Cao's warming, tonifying nature, appropriate in a formula that includes cold-natured phlegm-heat-clearing herbs (Dan Nan Xing, Zhu Ru, Zhi Shi). Gan Cao at sustained doses has pseudoaldosteronism-like interaction potential with corticosteroids, diuretics, and antihypertensive medications; veterinary review is warranted in animals on these medications.
Potential Drug Interactions
Di Tan San's drug interaction profile is driven by Dan Nan Xing and Shi Chang Pu, both of which require veterinary oversight for animals on antiepileptic, anesthetic, sedative, and neuromuscular medications due to their bioactive alkaloid and aromatic volatile oil content with CNS-modulating effects. Dan Nan Xing's strong alkaloid content creates interaction potential with antiepileptic medications (where the phlegm-wind-calming action may interact with medication dosing and seizure threshold management), anesthetic agents, and neuromuscular blocking agents; this is the formula's most significant drug interaction category and requires comprehensive veterinary medication review in any animal on these medications. Shi Chang Pu's beta-asarone content has mild CNS-modulating interaction potential with sedative, anesthetic, and antiepileptic medications. Zhi Shi's furanocoumarin content inhibits CYP3A4 with interaction potential for cyclosporine, tacrolimus, statins, and other narrow-therapeutic-index CYP3A4-metabolized medications. Ren Shen has interaction potential with anticoagulant, stimulant, antidiabetic, and antihypertensive medications. Gan Cao at sustained doses has pseudoaldosteronism-like effects that can potentiate corticosteroids and antagonize diuretics. The formula's cold-natured phlegm-heat-clearing herbs (Dan Nan Xing, Zhu Ru) and warm phlegm-drying herbs (Ban Xia, Ju Hong) create a balanced thermal formula appropriate for phlegm-wind and phlegm-orifice obstruction with or without a mild heat component; the formula is not appropriate for pure cold-phlegm patterns without orifice obstruction (where Er Chen San alone is sufficient) or for yin vacuity phlegm (where the drying herbs would worsen yin depletion).
Medication categories warranting extra caution include antiepileptic medications (Dan Nan Xing alkaloid content - seizure threshold interaction), anesthetic and sedative medications (Dan Nan Xing and Shi Chang Pu CNS interaction potential), neuromuscular blocking agents (Dan Nan Xing alkaloid interaction), CYP3A4-metabolized medications with narrow therapeutic indices including cyclosporine and tacrolimus (Zhi Shi furanocoumarin CYP3A4 inhibition), anticoagulant and antidiabetic medications (Ren Shen ginsenoside interactions), and corticosteroids and diuretics (Gan Cao pseudoaldosteronism-like effects). Your authorizing veterinarian will determine appropriateness based on your animal's condition, current medications, and confirmation of the phlegm-misting-the-orifices or wind-phlegm pattern through tongue quality, pulse character, and clinical assessment of the neurological presentation's TCVM mechanism.
VETERINARY AUTHORIZATION REQUIRED: Submit Your Authorization Request or Request a TCVM Telemedicine Consultation
Frequently Asked Questions
What conditions is Di Tan San used for in TCVM?
In Traditional Chinese Veterinary Medicine, Di Tan San is indicated for the phlegm-misting-the-orifices pattern and the wind-phlegm pattern, where phlegm accumulation has progressed beyond the lung and middle jiao level to obstruct the heart orifices and the channels of the head and brain, generating the neurological and cognitive presentations characteristic of phlegm at the consciousness and movement-control level. The phlegm-misting-the-orifices pattern generates altered consciousness, cognitive clouding, behavioral change, and episodic unresponsiveness as phlegm blocks the heart spirit's expression and the clear yang's ascent to the sensory and cognitive orifices of the head. The wind-phlegm pattern generates seizures, ataxia, tremors, and movement disorders when the accumulated phlegm combines with liver wind, with the phlegm providing the medium in which wind generates and the wind driving the phlegm's upward movement into the channels of the head and brain. This pattern also addresses vertigo and head-shaking from phlegm-wind obstructing the head channels. The tongue for these patterns is typically pale or dusky with a white or yellow greasy coating (reflecting phlegm and, when heat is present, phlegm-heat), and the pulse is slippery or wiry-slippery (reflecting the phlegm-wind combination). Your authorizing veterinarian will differentiate the phlegm-misting-the-orifices pattern from other causes of altered consciousness and seizure in animals, confirm the TCVM mechanism, and determine whether Di Tan San alone or in combination with additional wind-calming herbs is appropriate for your animal's specific presentation.
How is Di Tan San administered to dogs, cats, and horses?
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. Because Di Tan San contains Dan Nan Xing with significant CNS interaction potential in animals on antiepileptic, anesthetic, or neuromuscular medications, and Shi Chang Pu with aromatic volatile oil CNS interaction potential, comprehensive veterinary medication review is required before use - particularly for animals already on antiepileptic medications, where the interaction with Dan Nan Xing's alkaloid content and the formula's phlegm-wind-calming action requires careful veterinary coordination. Di Tan San is used for the active phlegm-misting-the-orifices or wind-phlegm presentation and is typically transitioned to a maintenance spleen-strengthening and phlegm-preventing formula once the acute phlegm-orifice obstruction has been resolved and the pattern has stabilized.
How long does it take to see results with Di Tan San?
As a formula targeting the phlegm-misting-the-orifices and wind-phlegm patterns, Di Tan San's response timeline depends on the severity and chronicity of the phlegm obstruction and the strength of the animal's righteous qi. In presentations with active phlegm-wind signs (recent-onset ataxia, altered mentation, episodic neurological events from phlegm-wind), early improvement may be seen within 2 to 4 weeks as the formula's orifice-opening and phlegm-dissolving action begins clearing the phlegm accumulation from the channels and orifices of the head. More complete resolution of the phlegm-misting pattern, including normalization of the tongue coating and pulse and sustained improvement in the neurological or cognitive signs, typically requires 4 to 12 weeks depending on the depth and duration of the phlegm accumulation. Chronic or deeply established phlegm-orifice obstruction with significant constitutional qi vacuity may require longer treatment and a sustained maintenance strategy to prevent recurrence. Your authorizing veterinarian will monitor the tongue, pulse, and clinical neurological signs throughout the treatment course and coordinate Di Tan San's use with any concurrent conventional veterinary management of the neurological presentation.
How does Di Tan San differ from Er Chen San, and when does the veterinarian choose Di Tan San over Er Chen San?
Er Chen San is the foundational phlegm-transforming formula for phlegm-damp accumulation in the lung, middle jiao, and channels at the respiratory, digestive, and general phlegm-damp level: productive cough, nausea and vomiting from phlegm, phlegm panting, and general phlegm-damp accumulation without neurological involvement. Di Tan San is the specialized derived formula appropriate when the phlegm pattern has progressed to obstruct the heart orifices and generate wind-phlegm at the neurological level: altered consciousness, cognitive clouding, seizures, ataxia, and movement disorders from phlegm-wind and phlegm-orifice obstruction. The clinical decision point is the presence of neurological or consciousness-obstructing signs: when phlegm generates altered mentation, episodic consciousness changes, seizure activity, or significant movement disorders, Di Tan San's Dan Nan Xing, Shi Chang Pu, Zhi Shi, and Zhu Ru provide the orifice-opening, phlegm-wind-dissolving, and neurological-level phlegm-clearing action that Er Chen San's simpler phlegm-transforming strategy cannot deliver. The veterinarian may use Er Chen San for milder phlegm-respiratory or phlegm-digestive presentations and transition to Di Tan San if the pattern deepens to include neurological signs, or use Di Tan San from the outset when the presenting signs already indicate phlegm at the orifice-obstructing and wind-phlegm level. Ongoing monitoring of tongue coating, pulse quality, and clinical signs guides formula selection and transition decisions throughout the treatment course.