Roots and rhizomesPhlegm-resolvingRadix Peucedani

Qian Hu (Peucedanum Root)

A practical guide to Qian Hu: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin NameRadix Peucedani
Chinese Name & Pinyin 前胡 · Qian Hu
Medicinal PartRoots and rhizomes
The herbQian Hu is the dried root of Peucedanum praeruptorum. Chai Hu and Jie Geng are different drugs. The cut face shows radial lines. The smell is aromatic.
Nature and channelsBitter, acrid, slightly cold. Enters the Lung. Bitterness directs down. Acridity disperses wind. Slight cold clears Lung heat.
Pharmacopoeia lineDirects qi downward and resolves phlegm. Disperses wind and clears heat. Used for phlegm-heat wheezing and fullness, yellow sticky sputum, and wind-heat cough with copious phlegm.
Pattern cuesYellow sticky sputum. Chest tightness and wheeze. Wind-heat cough. Rebellious qi.
In this articleQian Hu versus Chai Hu, Jie Geng, and Zi Wan. Directing the Lung down versus diffusing it up. Why cold sputum is a stop sign. Who should skip it.

What Is Qian Hu?

Qian Hu (前胡; Qián Hú; Latin: Peucedani Radix; English: peucedanum root / hogfennel root) is the dried root of Peucedanum praeruptorum Dunn. In Chinese medicine it is a phlegm-resolving, cough-calming herb. It is bitter, acrid, and slightly cold, enters the Lung channel, and its core actions are to direct qi downward and resolve phlegm, and to disperse wind and clear heat. It is not Chai Hu. Bupleurum courses the Liver, releases the exterior, and raises yang. Qian Hu is bitter and downbearing; it enters the Lung to dissolve phlegm and send qi down. It is not Jie Geng. Platycodon is the “boat herb” that diffuses and lifts. Qian Hu directs Lung qi down and transforms phlegm-heat. One character apart; one lifts, one descends. Do not mix them on a prescription.

It is used most often for three patterns:

  • Phlegm-heat wheezing and fullness — yellow sticky sputum, chest tightness, rebellious qi
  • Wind-heat cough with much phlegm — exterior wind-heat, cough that will not clear
  • Lung qi failing to descend — urgent wheeze, sticky sputum that is hard to spit

It is usually used raw. The usual decoction dose is 3–10 g. Wind-cold cough, thin cold sputum, and a cold weak spleen are a poor match. Bitter, acrid, and slightly cold, it is not a daily “phlegm root tea.”

When wind-heat carries phlegm, or phlegm-heat fills the Lung, cough, wheeze, and chest fullness are common. Qian Hu is bitter-downbearing and acrid-dispersing. It directs down, clears, and transforms, which is why it is often paired with Xing Ren, Sang Bai Pi, and Huang Qin. It directs down more than it tonifies. Weak qi with no desire to speak, and thin white sputum, become weaker if more downbearing is added.

Qian Hu is not a catch-all for phlegm or wheeze. In cold sputum or qi deficiency that cannot descend, using it alone can injure Lung qi. Whether it belongs in a formula, and how to pair it with Jie Geng, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Qian Hu Peucedanum Root

Qian Hu: Materia Medica Profile

Identification & Quality Standard

Radix Peucedani

Botanical Origin

The dried root of Peucedanum praeruptorum Dunn and Peucedanum decursivum (Miq.) Maxim.(Apiaceae)

Production Regions

Primarily produced in the Chinese provinces of Zhejiang, Sichuan, Hunan.

Quality Requirements

Superior medicinal material has thick and strong strip, soft texture, potent aroma.

Macroscopic Features

Peucedanum praeruptorum Dunn: Sub-cylindrical, conical or fusiform, slightly wrinkled, lower portion has branches, about 3~15cm long, 1~2cm diameter. Root head has stem scars and fibrous remnants of leaf sheaths; externally grayish-brown to black-brown, with irregular longitudinal grooves, longitudinal wrinkles, and horizontal lenticels; upper portion has dense rings. Relatively soft texture, the dry piece is hard, can be broken, fractured surface is uneven, loose; when examined under a magnifier, numerous tiny yellowish-brown scattered oil spots can be seen; cortex is thick, pale yellowish-white, cambium is obvious, xylem is pale yellow. Aromatic odor, slightly bitter, acrid taste. Peucedanum decursivum (Miq.) Maxim.: root head is relatively thick and short, rarely has fibrous remnants of leaf sheaths. Fractured surface cortex is easily split with xylem. Aromatic odor, slightly bitter, acrid taste.

Authentic Regions and Quality Identification

Traditionally, the best quality roots come from Anhui, Zhejiang, and Hunan provinces. However, quality also depends on harvest timing and storage.

  • Good Quality: Look for thick, sturdy roots with a grayish-brown outer skin. The texture should be slightly soft yet resilient, with a yellowish-white cross-section.
  • Scent and Taste: It has a mild, spicy aroma and a slightly bitter taste. The honey-roasted version is darker and smells distinctly of honey.
  • Caution: It can sometimes be confused with similar roots like white or purple flowered variations, which have different active properties.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Acrid, Bitter; Slightly coldLung

1. Historical Records

  • Shen Nong Ben Cao Jing: Listed it as a mid-grade herb, noting it helps clear stagnation in the stomach and intestines and resolves "cold and heat" evils.
  • Ming Yi Bie Lu: Highlighted its ability to remove phlegm, direct Qi downward, and treat coughs and chills.
  • Ben Cao Gang Mu: Emphasized its core role in the lungs, stating it "clears lung heat, transforms phlegm Qi, and treats coughs."

2. Evolution of Understanding

Over centuries, different physicians highlighted varying aspects of Qian Hu (Peucedanum Root):

  • Some focused on its ability to clear Lung heat and resolve hot phlegm.
  • Others noted its moistening nature, making it useful for deficiency patterns complicated by phlegm.
  • The general consensus is that it is best for exterior conditions mixed with phlegm. It is not a "cure-all" for every cough; using it for purely cold, deficient coughs might actually worsen symptoms.
Qian Hu Peucedanum Root

Core Efficacies & Traditional Applications

Traditional Functions

Disperses wind and heat, downbears qi, resolves phlegm. Apply to wind-heat common cold, cough with phlegm, yellow phlegm.

1. Primary Focus: Descending Qi and Resolving Phlegm

  • Traditional Function: Qian Hu (Peucedanum Root) excels at directing rebellious Lung Qi downwards and clearing stubborn, sticky phlegm.
  • Common Indications: It is highly effective for "Phlegm-Heat" blocking the lungs. Symptoms include frequent coughing, thick and sticky phlegm, chest tightness, or a wheezing sound in the throat.
  • Common Pairings: To boost its phlegm-clearing power, it is often paired with Ban Xia (Pinellia Rhizome). For better cough relief, it is used with Xing Ren (Apricot Seed). If there is significant Lung Heat, Huang Qin (Baical Skullcap Root) is added.
  • When to Avoid: Do not use it for "Cold-type" deficiency coughs, which are characterized by clear, watery phlegm and a lack of heat symptoms.

2. Secondary Focus: Dispersing Wind-Heat

  • Traditional Function: It helps clear external "Wind-Heat" pathogens while regulating lung function, making it great for respiratory discomfort during seasonal changes.
  • Common Indications: Best for Wind-Heat colds presenting with a cough, dry throat, mild fever, aversion to wind, headache, and small amounts of yellowish phlegm.
  • Common Pairings: Frequently combined with Bo He (Peppermint) and Sang Ye (Mulberry Leaf) to clear the external heat, along with Jie Geng (Platycodon Root) to soothe the cough.
  • When to Avoid: Avoid using it if your cold is driven by "Wind-Cold" (severe chills, no sweating, and clear, watery mucus).

3. Common Herb Pairings: The Synergistic Duo

A classic TCM combination is Qian Hu (Peucedanum Root) and Xing Ren (Apricot Seed).

  • Xing Ren is great at descending Qi to stop coughs and moisturizing the intestines.
  • Qian Hu descends Qi, clears phlegm, and disperses Wind-Heat.
  • Together, they tackle both the upward-rebellious Qi (the cough) and the sticky phlegm blocking the airways. This duo must be balanced by a practitioner to fit your specific needs.
Qian Hu Peucedanum Root

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Chemical Components

Modern lab tests show that Qian Hu (Peucedanum Root) contains coumarins, volatile oils, and flavonoids.

  • Lab Observations: In vitro and animal studies suggest these coumarins have anti-inflammatory properties, can relax tracheal smooth muscles, and may help expel phlegm.
  • Note: Clear conclusions on human clinical efficacy are still pending.

2. Research Focus

Current scientific interest mainly revolves around how the herb's coumarins regulate airway inflammation and relieve respiratory spasms. Some studies also explore its antioxidant potential, though more human trials are needed to bridge the gap between the lab and real-world results.

3. Research Limitations

It is crucial to remember that lab extracts are not the same as traditional TCM decoctions.

  • Synergy vs. Isolation: A single extracted compound does not capture the holistic, combined effect of the whole herb.
  • Variables: Variations in plant species, harvest times, and brewing methods can significantly change the chemical makeup. Therefore, isolated lab results should be viewed as a helpful reference rather than a complete definition of the herb's healing value.
Qian Hu Peucedanum Root

Comparing Similar Herbs

1. Shared Traits with Similar Herbs

Qian Hu (Peucedanum Root) is often compared to Jie Geng (Platycodon Root). Both regulate Lung Qi, treat respiratory coughs, and are frequently used for seasonal colds or phlegm buildup.

2. Core Differences

  • Nature: Qian Hu is slightly cold and focuses on clearing and descending. Jie Geng is neutral and focuses on opening and ascending.
  • Direction of Action: Qian Hu pushes down to stop rebellious Qi (coughing) and clear phlegm. Jie Geng pushes up and out to ventilate the lungs, soothe the throat, and expel phlegm or pus.
  • Clinical Presentation: Choose Qian Hu for heavy, sticky phlegm with heat signs (mild fever, dry throat). Choose Jie Geng if you have a severely sore throat, hoarse voice, or phlegm that feels stuck and hard to cough up.

3. A One-Sentence Summary

Qian Hu (Peucedanum Root) pushes energy downward to clear heat and resolve sticky phlegm, while Jie Geng (Platycodon Root) opens the lungs upward to soothe the throat and help you expel phlegm.

Qian Hu Peucedanum Root

Classical Formulas Containing Qian Hu

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Formulas vs. Single Herbs

  • Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
  • Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. Home Herbal Teas

  • Peucedanum and Platycodon Tea:
    • Ingredients: 3g Qian Hu (Peucedanum Root), 3g Jie Geng (Platycodon Root), 2g Bo He (Peppermint), a small piece of rock sugar.
    • Method: Rinse the herbs. Steep Qian Hu and Jie Geng in boiling water for 10 minutes. Add the Bo He and rock sugar, stir, and drink.
    • Best For: Mild seasonal coughs with a dry throat and hard-to-expel phlegm caused by Wind-Heat.
    • Not For: People with a cold constitution (those who always feel cold and have clear, watery phlegm).
    • Frequency: 1–2 times a week. Do not drink continuously.

2. Processing Differences and Brewing

  • Raw vs. Honey-Roasted: Sheng Qian Hu (Raw) is stronger for clearing Wind-Heat and Lung Heat. Mi Zhi Qian Hu (Honey-Roasted) is gentler, more moisturizing, and better for elderly or weakened individuals who need phlegm relief without drying out their system.
  • Brewing Prep: It can be boiled directly with other herbs. Soak in water for 30 minutes, bring to a boil, then simmer on low heat for about 20 minutes.

3. Dosage and Usage Cycle

  • Dosage: Clinical doses range from 3g to 10g. For home dietary use, keep it around 3g.
  • Cycle: Use for short-term relief (3 to 5 days). If symptoms don't improve, consult a doctor.
Qian Hu Peucedanum Root

Contraindications & Safety Warnings

1. Who Should Avoid It

  • Cold-Type Coughs: Strictly avoid if your cough is accompanied by clear, watery phlegm and chills.
  • Special Populations: Pregnant and nursing women should avoid it unless prescribed by a doctor. Children and the elderly require adjusted, lower doses.
  • Organ Dysfunction: Those with liver or kidney impairment should avoid self-medicating to prevent adding stress to these organs.
  • Allergies: Avoid if you are allergic to plants in the Apiaceae (celery/carrot) family.

2. Drug Interactions and Dietary Notes

  • Interactions: Qian Hu may interact with blood thinners, blood pressure medications, diabetes drugs, and sedatives. If you take prescription meds, space your herbal tea at least 1 to 2 hours apart and consult your doctor first.

3. Adverse Reactions and Overdose Risks

  • Side Effects: Because it is slightly cold, overusing it can cause stomach discomfort or mild diarrhea.
  • When to Seek Help: If you experience rashes, persistent vomiting, difficulty breathing, or your symptoms rapidly worsen, stop using it immediately and seek emergency medical care.

Frequently Asked Questions About Qian Hu

What is Qian Hu? Are Bai Hua Qian Hu, Zi Hua Qian Hu, Bai Qian and Mi Qian Hu the same?
Current pharmacopoeial Qian Hu (前胡) is mainly the dried root of Peucedanum praeruptorum (Bai Hua Qian Hu). The pharmacopoeial name is Peucedani Radix. Zi Hua Qian Hu was once used as the same article and is now often a separate or local item—not an automatic equal swap. Bai Qian is the rhizome of Cynanchum stauntonii and allies: downbears Qi and transforms phlegm, leaning to cold-phlegm cough—similar sound, different family. Mi Qian Hu is honey-fried: less cold, better to moisten the Lung and stop cough. Write Qian Hu or Mi Qian Hu; do not confuse it with Bai Qian or Angelica pubescens.
What are the TCM properties and traditional uses of Qian Hu?
According to the Chinese Pharmacopoeia, Qian Hu is bitter, acrid and slightly cold, enters the Lung channel, and acts to downbear Qi and transform phlegm, and disperse wind and clear heat. It is used for phlegm-heat wheezing and fullness, coughing yellow sticky phlegm, and wind-heat cough with much phlegm. Acrid-dispersing, bitter-downbearing and slightly cold—suited to wind-heat and phlegm-heat congesting the Lung, not to Yin-deficiency dry cough without phlegm or cold-rheum thin sputum.
How do you choose raw versus honey-fried Qian Hu? Is a special decoction needed?
Exterior wind-heat and phlegm-heat yellow sticky sputum use raw Qian Hu, stronger to disperse and downbear; lingering dry cough with little phlegm uses honey-fried Qian Hu, moistening the Lung and reducing cold. Slices go in the pot; first- or late-decoction is not required. When paired with Bai Qian, sort cold versus heat phlegm.
What is the usual dosage? Can it be used daily to transform phlegm and stop cough?
The pharmacopoeial decoction dose is 3–10 g. It is not a daily “Lung-clearing tea.” Yin-deficiency dry cough and cold-rheum thin sputum only suffer more when cleared. Wind-heat phlegm-heat needs a short course naming raw or honey-fried—not a self-made long drink.
What are the contraindications? Can it be used in pregnancy?
Use caution or avoid in Yin-deficiency blazing fire, Qi-Blood insufficiency and cold-rheum cough and wheeze. Slightly cold dispersing-downbearing is wrong without exterior pathogen or phlegm-heat. Pregnancy with exterior wind-heat and much phlegm may use it cautiously; deficient-cold fetal stirring needs care. It fears Veratrum and dislikes Gleditsia. Stop if dry mouth without phlegm or a cold epigastrium appears.
Can Qian Hu stop cough, transform phlegm and disperse wind-heat?
It can help. Wind-cold with rheum and cough with much phlegm joins apricot kernel, perilla leaf and platycodon in Xing Su San. Phlegm-heat yellow sticky sputum joins mulberry root bark, Scutellaria and Zhejiang Fritillaria. It downbears Qi, transforms phlegm, disperses wind and clears heat—not a specific for every cough, every asthma or every common cold. High fever with urgent wheeze and hemoptysis are emergencies.
Can Qian Hu be drunk daily as a cough, anti-inflammatory or Lung-clearing tea?
Wind-heat phlegm-heat may enter a short formula; Yin deficiency and cold rheum only suffer more. “Qian Hu clears the Lung and fights inflammation” does not replace respiratory evaluation. Downbearing Qi and transforming phlegm should name raw or honey-fried Qian Hu and a 3–10 g dose, and distinguish it from Bai Qian.
How do you choose among Qian Hu, Bai Qian, Jie Geng, Zi Wan and Sang Bai Pi?
Peucedanum is bitter-acrid and slightly cold: downbears Qi, transforms phlegm, disperses wind and clears heat—suited to wind-heat and phlegm-heat yellow sticky sputum. Cynanchum is acrid-sweet and slightly warm: downbears Qi and transforms phlegm, leaning to cold-damp phlegm cough—often paired with Qian Hu but opposite in temperature. Platycodon is bitter-acrid-neutral: diffuses the Lung, expels phlegm, benefits the throat and expels pus—mainly lifting. Aster is bitter-acrid-warm: moistens the Lung, downbears Qi, transforms phlegm and stops cough—usable in cold or heat lingering cough. Mulberry root bark is sweet-cold: drains the Lung, calms wheezing and promotes urination to disperse swelling. Wind-heat phlegm-heat favors Qian Hu; cold phlegm favors Bai Qian; benefiting the throat favors Jie Geng; lingering cough favors Zi Wan; Lung-heat wheezing fullness favors Sang Bai Pi. They may be paired; all are wrong as pure dispersing-downbearing in Yin deficiency without phlegm.
Which herbs is Qian Hu combined with? What are the representative formulas?
Exterior cool-dryness or wind-cold cough joins apricot kernel, perilla leaf, platycodon and Pinellia in Xing Su San. Phlegm-heat cough and wheeze join mulberry root bark, Scutellaria, Zhejiang Fritillaria and apricot kernel. Write Qian Hu or Mi Qian Hu; do not dispense Bai Qian.
How do you choose and store Qian Hu?
Choose slightly curved cylindrical roots with a yellow-white cut face showing oil spots, a strong aroma and a slightly bitter-acrid taste. Hollow, withered, moldy, moth-eaten and scentless lots are inferior. Store cool and dry against mold and moths. Buy pharmacopoeial Qian Hu (Bai Hua Qian Hu); do not replace it with an equal weight of Bai Qian or “wild angelica.”

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Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.

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Qian Hu (Peucedanum Root): Descend Qi, Transform Phlegm, and Disperse Wind-Heat