Herb Root (根 gēn)

Qian Hu

Peucedanum root · 前胡

Peucedanum praeruptorum Dunn · Radix Peucedani

Also known as: Bai Hua Qian Hu (白花前胡), Hogfennel root, White-flowered hogfennel root,

Qian Hu (Peucedanum root) plant

Images shown are for educational purposes only

Qian Hu (Peucedanum root) is a widely used herb for respiratory complaints. It helps guide Qi downward and clear phlegm from the lungs, making it particularly helpful for coughs with thick or yellowish phlegm, chest congestion, and wheezing. It also gently disperses Wind-Heat, so it is often included in formulas for colds and flu that affect the lungs.

Category Herbs that cool and transform Phlegm-Heat (清化热痰药)
Therapeutic focus Respiratory Health Cough and Phlegm Relief Immune Support Chest Congestion Relief

TCM Properties

Temperature

Slightly Cool

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels entered

Lungs

Parts used

Root (根 gēn)

Available in our store
View in Store
From $23.00

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Qian Hu does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Qian Hu is primarily used to support these areas of health:

Respiratory Health Cough and Phlegm Relief Immune Support Chest Congestion Relief

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Qian Hu performs to restore balance in the body:

Descends Qi and Transforms Phlegm Disperses Wind-Heat Resolves Phlegm and Stops Cough

How these actions work

'Directs Qi downward and transforms phlegm' is Qian Hu's primary action. In TCM, the Lungs are supposed to send Qi and fluids downward (a function called 'descending and purifying'). When the Lungs lose this ability, Qi rebels upward causing cough, wheezing, and chest fullness, while fluids congeal into phlegm. Qian Hu's bitter taste drives things downward and its pungent taste disperses and moves stagnation, making it especially effective for cough with copious, thick, yellowish phlegm and a feeling of fullness in the chest. It is commonly paired with herbs like apricot seed (Xing Ren), Perilla seed (Su Zi), or mulberry bark (Sang Bai Pi) to strengthen this descending action.

'Disperses Wind-Heat' is Qian Hu's secondary action. Although its dispersing power is milder than dedicated exterior-releasing herbs, its pungent taste allows it to gently open the body's surface and expel Wind-Heat pathogens that have invaded the Lungs. This makes it useful in the early stages of a cold or flu with fever, headache, and cough with sticky phlegm. For this purpose it is often combined with mint (Bo He), burdock seed (Niu Bang Zi), or balloon flower root (Jie Geng). Classical sources note that despite being slightly cool in nature, Qian Hu can also be combined with warm, pungent herbs like Perilla leaf to treat Wind-Cold cough, as seen in the formula Xing Su San.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Qian Hu is used to help correct these specific patterns.

Why Qian Hu addresses this pattern

Qian Hu is bitter and pungent with a slightly cool thermal nature, entering the Lung channel. Its bitter taste drives Qi downward and dries Dampness, while its cool nature clears Heat. In Phlegm-Heat obstructing the Lungs, hot, thick, sticky phlegm blocks the Lung's descending function, causing cough with yellow phlegm, wheezing, and chest fullness. Qian Hu directly addresses this by descending rebellious Lung Qi and transforming the phlegm that is blocking the airways, while its cool nature helps clear the Heat component that is making the phlegm thick and discolored.

A practitioner would look for one or more of these signs

Cough With Yellow Or Blood Tinged Sputum

Cough with thick yellow phlegm that is hard to expectorate

Wheezing

Wheezing and labored breathing from phlegm obstruction

Chest Congestion

Chest fullness and oppression

Commonly Used For

These are conditions where Qian Hu is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Phlegm-Heat in the Lungs Wind-Heat invading the Lungs

TCM Interpretation

TCM understands acute bronchitis as an invasion of external pathogenic factors (Wind-Heat or Wind-Cold) that disrupts the Lung's descending and dispersing functions. The pathogens lodge in the Lungs, causing Lung Qi to rebel upward (manifesting as cough) and fluids to congeal into phlegm. If Heat is involved, the phlegm becomes thick and yellow. The key organ is the Lung, and the key pathological products are phlegm and rebellious Qi.

Why Qian Hu Helps

Qian Hu directly targets the two core problems of acute bronchitis: rebellious Lung Qi and phlegm accumulation. Its bitter, descending nature redirects Lung Qi downward to stop coughing, while its phlegm-transforming action helps clear the airways. Its slightly cool nature is particularly suited to the Heat-type bronchitis that presents with yellow, sticky sputum. Additionally, its mild exterior-releasing action helps expel any lingering pathogen from the initial respiratory infection that triggered the bronchitis.

Also commonly used for

Chronic Bronchitis

Used in formulas for phlegm-predominant chronic cough

Influenza

Early stage with fever, headache, and cough

Asthma

Phlegm-type asthma with chest congestion

Hypochondrial Pain That Is Worse On Coughing And Breathing

Productive cough from various causes

Pneumonia

Including interstitial pneumonia in children

Wheezing

Wheezing from phlegm obstruction

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Slightly Cool

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels Entered

Lungs

Parts Used

Root (根 gēn)

Dosage & Preparation

These are general dosage guidelines for Qian Hu — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

3–10g

Maximum dosage

Up to 12g in standard decoction for acute phlegm-heat cough, under practitioner guidance. No toxic dose threshold has been established.

Dosage notes

Use the lower end of the range (3–6g) when the primary goal is mild exterior-releasing action for wind-heat. Use the higher end (6–10g) when targeting phlegm-heat cough with thick yellow sputum and chest oppression. Honey-processed Qian Hu (蜜前胡) is preferred for dry cough or lung dryness conditions, as honey processing enhances its lung-moistening effect. Raw (unprocessed) Qian Hu is better suited for dispersing wind-heat and resolving phlegm-heat.

Preparation

No special decoction handling is required. Qian Hu is decocted normally with other herbs. Two processed forms are commonly used: raw sliced Qian Hu (生前胡) for dispersing wind-heat and resolving phlegm-heat, and honey-processed Qian Hu (蜜前胡) for moistening the lungs and stopping cough in dryness patterns.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Qian Hu does

Processing method

Qian Hu slices are mixed with refined honey diluted in a small amount of boiling water, allowed to absorb the honey, then stir-fried over low heat until the slices are no longer sticky to the touch. The standard ratio is approximately 25 kg of honey per 100 kg of Qian Hu slices.

How it changes properties

Honey processing shifts the herb's action from primarily clearing Heat and descending Qi toward moistening the Lungs and stopping cough. The raw form's slightly cool, dispersing nature is moderated, and the sweet, moistening quality of honey is added. The processed form is better suited for dry-type coughs with little phlegm or dry throat.

When to use this form

Use honey-processed Qian Hu (Mi Qian Hu) when the cough involves Lung dryness with symptoms like a dry throat, chest tightness, scant sticky phlegm, or when the patient's constitution tends toward dryness. The raw form is preferred when the primary presentation is phlegm-heat or external Wind-Heat.

Common Herb Pairs

These ingredients are traditionally combined with Qian Hu for enhanced therapeutic effect

Bai Qian
Bai Qian 1:1 (Qian Hu 10g : Bai Qian 10g)

Qian Hu and Bai Qian (Cynanchum root) both descend Qi and transform phlegm, but they work from different angles. Qian Hu is slightly cool and also disperses the exterior (walking outward), while Bai Qian is slightly warm and focuses purely on descending Lung Qi (walking inward). Together they create a comprehensive one-dispersing, one-descending action that restores the Lung's full range of function and powerfully resolves phlegm stagnation.

When to use: Cough with copious phlegm and impaired Lung function, regardless of whether the pattern leans warm or cool. Particularly useful for persistent cough where phlegm is difficult to expectorate and the chest feels congested.

Xing Ren
Xing Ren 1:1 (Qian Hu 9g : Xing Ren 9g)

Apricot seed (Xing Ren) descends Lung Qi and stops cough, complementing Qian Hu's Qi-descending and phlegm-transforming actions. Together they strongly restore the Lung's downward-directing function, addressing cough, wheezing, and phlegm from multiple angles.

When to use: Cough and wheezing with chest fullness due to Lung Qi failing to descend, with phlegm accumulation. Used in both Wind-Heat and Wind-Cold patterns.

Jie Geng
Jie Geng 1:1 (Qian Hu 6-9g : Jie Geng 6-9g)

Jie Geng (Platycodon root) opens and raises Lung Qi while Qian Hu descends it. This ascending-descending pair restores the Lung's full cycle of dispersing and purifying. Jie Geng expels phlegm upward and outward while Qian Hu drives Qi and phlegm downward, together clearing the chest from both directions.

When to use: Cough with phlegm and chest oppression where the Lung's Qi movement is impaired in both directions. Commonly seen together in formulas like Xing Su San and Ren Shen Bai Du San.

Ban Xia
Ban Xia 1:1 (Qian Hu 9g : Ban Xia 9g)

Ban Xia (Pinellia) is warm and strongly dries Dampness and transforms phlegm, while Qian Hu is slightly cool and descends Qi to resolve phlegm. Together they address phlegm from both the Dampness angle (Ban Xia) and the Qi stagnation angle (Qian Hu), making the combination effective for a wider range of phlegm presentations.

When to use: Cough with copious phlegm and chest congestion, especially when Dampness and Qi stagnation both contribute to the phlegm. Used in formulas like Su Zi Jiang Qi Tang.

Key Formulas

These well-known formulas feature Qian Hu in a prominent role

Xing Su San 杏蘇散 Deputy

Xing Su San (from the Wen Bing Tiao Bian) treats cool-dryness invading the Lungs with cough and thin phlegm. Qian Hu serves as Deputy, assisting the King herbs Perilla leaf and apricot seed by both dispersing the exterior pathogen and descending Qi to resolve phlegm. This formula showcases Qian Hu's dual ability to release the exterior while directing Lung Qi downward.

Su Zi Jiang Qi Tang 蘇子降氣湯 Deputy

Su Zi Jiang Qi Tang (from the Tai Ping Hui Min He Ji Ju Fang) treats upper excess with lower deficiency pattern featuring cough, wheezing, and copious phlegm. Qian Hu serves as Deputy alongside Ban Xia and Hou Po, helping the King herb Zi Su Zi to descend Qi and transform phlegm. This formula highlights Qian Hu's core action of descending Lung Qi to stop cough and wheezing.

Ren Shen Bai Du San 人參敗毒散 Assistant

Ren Shen Bai Du San (from the Tai Ping Hui Min He Ji Ju Fang) treats exterior Wind-Cold-Damp with underlying Qi deficiency. Qian Hu serves as Assistant, working with Jie Geng and Zhi Ke to regulate Lung Qi and resolve phlegm, while the King herbs Qiang Huo and Du Huo focus on releasing the exterior. This formula demonstrates Qian Hu's supporting role in managing phlegm and cough within a comprehensive exterior-releasing strategy.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Bai Qian
Qian Hu vs Bai Qian

Both Qian Hu and Bai Qian descend Qi and transform phlegm for cough. The key difference: Qian Hu is slightly cool and also disperses Wind-Heat from the exterior, so it is preferred when cough comes with an external pathogen invasion or when the phlegm is hot and yellow. Bai Qian is slightly warm and focuses purely on descending Lung Qi, making it stronger for Lung Qi rebellion with profuse phlegm but without significant exterior symptoms or Heat signs.

Chai Hu
Qian Hu vs Chai Hu

Classical sources call these two 'the two Hu' (二胡), noting both can disperse Wind. However, their directions are opposite: Qian Hu enters the Lung channel and directs Qi downward, making it a phlegm-resolving, cough-stopping herb. Chai Hu enters the Liver and Gallbladder channels and raises Qi upward, making it an exterior-releasing and Liver-soothing herb. They are sometimes used together to address both ascending and descending aspects of Qi circulation during external invasions.

Zh
Qian Hu vs Zhe Bei Mu

Both resolve phlegm-heat in the Lungs, but Zhe Bei Mu (Zhejiang Fritillaria) is more strongly cooling and better at clearing Heat and dissipating nodules, making it preferred for hot phlegm with lumps or swellings. Qian Hu's advantage is its Qi-descending action, which addresses the Lung Qi rebellion component (cough, wheezing, chest tightness) more directly than Bei Mu.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Qian Hu

Qian Hu is commonly confused with or substituted by several related species: 1. Purple-flowered Qian Hu (紫花前胡, Angelica decursiva): Historically used interchangeably and listed as a co-source in earlier Pharmacopoeia editions (1963-2000), but separated since 2010. The roots appear similar but the cross-section is more whitish with less obvious radial markings. Contains different coumarin profiles (furanocoumarin-type rather than pyranocoumarin-type). 2. Ying Qian Hu / Hard Qian Hu (硬前胡, Peucedanum terebinthaceum, also called Shi Fang Feng): Used as a substitute in Shaanxi, Hebei, Henan, and Guangxi provinces under the trade name "Ying Miao Qian Hu." It can be distinguished by HPLC profiling showing different major coumarin markers. 3. Various provincial substitutes from different genera, including Shao Mao Bei Qian Hu (少毛北前胡, Angelica paeoniifolia), Duan Pian Gao Ben (短片藁本), and Chang Qian Hu (长前胡). These are permitted in some local standards but differ chemically and should not be confused with the official Pharmacopoeia species. Authentic Bai Hua Qian Hu can be verified by its characteristic aromatic fragrance, yellowish-white cross-section with visible brown oil dots, and TLC/HPLC identification of praeruptorins A and B as marker compounds.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Qian Hu

Non-toxic

Qian Hu is classified as non-toxic in the Chinese Pharmacopoeia and in classical sources such as the Ming Yi Bie Lu, which states it is "bitter, slightly cold, and non-toxic." No significant toxic components have been identified at standard dosages. The main active constituents are coumarin-type compounds (praeruptorins A, B, C, D, E), which have been studied for their calcium-channel-blocking and anti-inflammatory properties. At therapeutic doses, no special toxicity concerns apply.

Contraindications

Situations where Qian Hu should not be used or requires extra caution

Caution

Yin deficiency with vigorous Fire producing cough and wheezing. The Ben Cao Jing Shu warns against using Qian Hu when cough arises from depleted true Yin rather than from phlegm or external pathogens, as its dispersing and descending properties would further damage Yin fluids.

Caution

Qi deficiency and Blood insufficiency conditions. Qian Hu's bitter, acrid, and slightly cold nature would further deplete Qi and Blood in already deficient patients.

Caution

Cold-type phlegm or thin watery phlegm (Han Yin) cough. As a slightly cold herb, Qian Hu would worsen cold-type phlegm conditions where warming and transforming methods are indicated instead.

Caution

Internal heat and irritability from Yin deficiency presenting with exterior symptoms mimicking external pathogen invasion. The Ben Cao Jing Shu specifically warns that when heat and cold sensations arise from internal deficiency rather than external invasion, Qian Hu is prohibited.

Caution

Headache caused by Blood deficiency rather than phlegm obstruction. Using Qian Hu's dispersing action would be inappropriate and ineffective for headaches of deficient origin.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Qian Hu

Qian Hu is noted in the Ben Cao Jing Ji Zhu (本草经集注) by Tao Hongjing as: "Ban Xia is its envoy (使). It is averse to (恶) Zao Jia (Gleditsia). It fears (畏) Li Lu (Veratrum)." While Qian Hu does not appear directly in the formal Eighteen Incompatibilities rhyme, its stated fear of Li Lu (藜芦) connects it to the broader Li Lu incompatibility group. The Eighteen Incompatibilities state that Li Lu is incompatible with all forms of Shen (ginseng, etc.), Xi Xin, and Shao Yao. Although Qian Hu is not listed in the standard rhyme, the classical warning to avoid combining it with Li Lu should be respected.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe at standard doses during pregnancy in classical usage. Several classical texts specifically mention Qian Hu as being used to calm the fetus (安胎) and treat fever during pregnancy. The Ri Hua Zi Ben Cao states it can "quiet the fetus," and the Ben Cao Hui Yan lists pregnancy with fever among its indications. However, as a slightly cold, dispersing herb, it should be used with caution and only when there is a clear indication of phlegm-heat or external pathogen. It is not appropriate for pregnancy with underlying Qi or Blood deficiency patterns. Practitioner guidance is recommended.

Breastfeeding

No specific classical or modern contraindications for breastfeeding have been documented. Qian Hu is classified as non-toxic and is used at moderate doses. However, its slightly cold nature means it could theoretically affect breast milk in mothers with Spleen-Stomach cold deficiency. Use standard doses for short durations when indicated, and discontinue if the nursing infant shows digestive disturbance.

Children

Qian Hu has been used in pediatric practice in classical texts. The Ri Hua Zi Ben Cao mentions it for treating childhood gan (malnutrition) conditions, and the Ben Cao Tong Xuan notes it can stop night crying in infants. For children, dosage should be reduced proportionally based on age and body weight, typically one-third to one-half of the adult dose. It is generally well tolerated in children when appropriately indicated for cough with phlegm.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Qian Hu

Calcium channel blockers and antihypertensives: Praeruptorin A, the major active compound in Qian Hu, has been identified as a calcium channel blocker in pharmacological studies. Theoretically, concurrent use with pharmaceutical calcium channel blockers (such as amlodipine or nifedipine) or other antihypertensive medications could produce additive blood-pressure-lowering effects. Caution is advised for patients on antihypertensive therapy.

CYP3A4-metabolized drugs: Coumarin compounds are metabolized primarily via CYP3A4 in hepatic microsomes. While no direct clinical interaction studies have been conducted, there is a theoretical potential for Qian Hu to interact with drugs that are substrates of, or metabolized by, CYP3A4. Patients taking medications with narrow therapeutic indices that are CYP3A4 substrates should exercise caution.

Antiplatelet and anticoagulant agents: Some coumarin derivatives in Qian Hu have shown effects on platelet aggregation in preclinical studies. Patients taking warfarin, aspirin, or other anticoagulant/antiplatelet agents should be monitored if using Qian Hu concurrently.

Dietary Advice

Foods and dietary considerations when taking Qian Hu

When taking Qian Hu for phlegm-heat cough, avoid greasy, fried, and excessively sweet foods, which tend to generate dampness and phlegm. Cold and raw foods should be limited if there is concurrent Spleen weakness. Spicy, hot foods such as chilli, ginger, and alcohol should be moderated when the condition involves heat signs. Light, easily digestible foods that support the Lung and Spleen are preferable.

Botanical Description

Physical characteristics and morphology of the Qian Hu source plant

Peucedanum praeruptorum Dunn (White-flowered Qian Hu) is a perennial herbaceous plant in the Apiaceae (Umbelliferae) family. The stem is relatively short and greyish-brown, cylindrical, and covered with fine hairs. The root-neck is stout, brownish, and conical in shape. The leaves are large with a maple-leaf-like outline, green with fine hairs on the surface, and serrated margins.

The plant produces small, pale yellow flowers arranged in compound umbels, blooming from April to June. Fruits ripen from July to September and are oval, flattened, double-winged schizocarps. It thrives in cool, moist climates and is cold-tolerant, preferring deep, loose, fertile sandy-loam soils. It is commonly found on mountain slopes, forest margins, roadsides, and semi-shaded grassy hillsides at elevations of 250 to 2000 metres.

The closely related species Angelica decursiva (Miq.) Franch. et Sav. (Purple-flowered Qian Hu) was historically used interchangeably, but since the 2010 edition of the Chinese Pharmacopoeia, only P. praeruptorum is the official source for Qian Hu, while Purple-flowered Qian Hu is listed separately.

Sourcing & Harvesting

Where Qian Hu is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Winter through early spring, when the above-ground stems and leaves have withered or before the flower stalk emerges. Cultivated crops are typically harvested after 2 to 3 years of growth.

Primary growing regions

The best quality Qian Hu (白花前胡) has historically come from Zhejiang province, where it is considered a 道地药材 (terroir herb). Zhejiang Chun'an and Lin'an counties produce a prized short-branch variety with black skin and white flesh known as "Qian Hu Tou" (前胡头), regarded as the highest quality. The herb from the Xin River valley of Jiangxi province, called "Xin Qian Hu" (信前胡), is also historically esteemed. Major producing regions today include Zhejiang, Hunan, Sichuan, Anhui, and Jiangxi provinces. The Purple-flowered species is mainly produced in Jiangxi and Anhui. Classical sources note that northern-grown specimens are generally superior, hence the traditional name "Bei Qian Hu" (北前胡, Northern Qian Hu) in formularies.

Quality indicators

Good quality Bai Hua Qian Hu (White-flowered Qian Hu) root is irregularly cylindrical, conical, or spindle-shaped, slightly twisted, 3 to 15 cm long and 1 to 2 cm in diameter. The surface should be dark brown to grey-yellow, with stem scars and fibrous leaf sheath remnants at the root head, dense fine ring-markings at the upper end, and longitudinal grooves with horizontal lenticels below. The texture should be relatively soft when fresh and firm but breakable when dry. The cross-section should be pale yellowish-white with numerous scattered brownish-yellow oil dots in the bark, a brown cambium ring, and radially arranged medullary rays. It should have a distinct aromatic fragrance and a slightly bitter, acrid taste. Roots that are pithy, hollow, or lack aromatic scent are inferior. The traditional saying "black skin, white flesh" (外黑里白) describes the ideal appearance.

Classical Texts

Key passages from the classical Chinese medical texts that describe Qian Hu and its therapeutic uses

Ming Yi Bie Lu (名医别录)

Chinese: 主疗痰满胸胁中痞，心腹结气，风头痛，去痰实，下气。治伤寒寒热，推陈致新，明目益精。

English: It mainly treats phlegm fullness with obstruction in the chest and flanks, knotted Qi in the heart and abdomen, wind-type headache. It eliminates substantial phlegm, directs Qi downward. It treats alternating cold and heat from Cold Damage, expels the old and promotes the new, brightens the eyes and enriches the essence.

Ben Cao Gang Mu (本草纲目) — Li Shizhen

Chinese: 前胡，乃手足太阴、阳明之药，与柴胡纯阳上升，入少阳、厥阴者不同也。其功长于下气，故能治痰热喘嗽、痞膈呕逆诸疾。气下则火降，痰亦降矣，所以有推陈致新之绩，为痰气要药。

English: Qian Hu is a medicine of the hand and foot Tai Yin and Yang Ming channels, different from Chai Hu which is purely ascending Yang and enters the Shao Yang and Jue Yin. Its strength lies in directing Qi downward, and so it can treat phlegm-heat wheezing and cough, epigastric obstruction, and rebellious vomiting. When Qi descends, Fire also descends, and phlegm follows suit. This is why it has the merit of expelling the old and promoting the new, and is an essential medicine for phlegm and Qi disorders.

Ben Cao Jing Shu (本草经疏)

Chinese: 不可施诸气虚血少之病。凡阴虚火炽，煎熬真阴，凝结为痰而发咳喘；真气虚而气不归元，以致胸胁逆满；头痛不因于痰，而因于阴血虚；内热心烦，外现寒热而非外感者，法并禁用。

English: It must not be applied to conditions of Qi deficiency and Blood insufficiency. Whenever Yin deficiency generates blazing Fire that scorches true Yin, congealing into phlegm that causes cough and wheezing; whenever true Qi is deficient and cannot return to its origin, causing rebellious fullness of the chest and flanks; whenever headache arises not from phlegm but from Yin-Blood deficiency; whenever internal heat and irritability present with exterior cold-heat signs that are not from external invasion — in all these cases, its use is prohibited.

Ben Cao Tong Xuan (本草通玄)

Chinese: 前胡，肺肝药也。散风驱热，消痰下气，开胃化食，止呕定喘，除嗽安胎，止小儿夜啼。柴胡、前胡，均为风药，但柴胡主升，前胡主降为不同耳。

English: Qian Hu is a medicine of the Lung and Liver. It disperses Wind and drives out Heat, resolves phlegm and directs Qi downward, opens the Stomach and promotes digestion, stops vomiting and calms wheezing, relieves cough and quiets the fetus, and stops night crying in infants. Chai Hu and Qian Hu are both Wind medicines, but Chai Hu mainly ascends, while Qian Hu mainly descends — this is their key difference.

Historical Context

The history and evolution of Qian Hu's use in Chinese medicine over the centuries

The name Qian Hu (前胡) first appeared in the Ming Yi Bie Lu (Supplementary Records of Famous Physicians), compiled around the late Han to early Six Dynasties period. It was notably absent from the Shen Nong Ben Cao Jing, which listed Chai Hu but not Qian Hu. Tao Hongjing commented that Qian Hu resembles Chai Hu but is softer, and that physicians only began using it in later generations. He noted the best variety came from Wuxing (present-day Huzhou, Zhejiang).

The relationship between Qian Hu and Chai Hu has been a central theme throughout its history. Both are classified as "wind medicines" from the Umbelliferae family, and early physicians like Tao Hongjing considered their therapeutic effects nearly identical. Li Shizhen in the Ben Cao Gang Mu made the influential distinction: Chai Hu ascends and enters the Shao Yang and Jue Yin, while Qian Hu descends and enters the Tai Yin and Yang Ming. This pairing of "ascending Chai Hu, descending Qian Hu" (柴胡主升，前胡主降) became a foundational teaching in Chinese herbalism, and the two are sometimes called the "Two Hu" (二胡) or referred to as the paired "wind medicines."

The classical processing method from Lei Gong Pao Zhi Lun (Lei's Treatise on Drug Processing) prescribed scraping off the dark outer bark, finely slicing the root, soaking it in sweet bamboo sap, and sun-drying. Later dynasties simplified processing to removing the root head, washing, slicing, and drying. Honey-processed Qian Hu (蜜前胡) was developed to enhance its lung-moistening properties for dry cough conditions.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Qian Hu

1

Comprehensive Review: Traditional Uses, Pharmacology, and Phytochemistry of Peucedanum praeruptorum Dunn (2024)

Wang Y, et al. Frontiers in Pharmacology, 2024, 15: 1352657.

This systematic review summarized the phytochemistry, pharmacology, and traditional uses of P. praeruptorum. The plant was found to contain over 119 distinct phytochemicals, mainly coumarins (praeruptorins A and B being key markers). Extracts and purified compounds demonstrated anti-inflammatory, neuroprotective, antitumor, anti-osteoclastogenic, antidepressant, and osteogenic effects in preclinical models.

DOI
2

Systematic Review: Biological Activities and Pharmacokinetics of Praeruptorins from Peucedanum Species (2013)

Sarkhail P, et al. BioMed Research International, 2013, 2013: 343808.

This review compiled evidence on praeruptorins, the angular-type pyranocoumarins from P. praeruptorum. Multiple reports demonstrated beneficial pharmacological effects on cardiovascular, pulmonary, immune, and nervous system diseases attributed to praeruptorins. The review also covered structure-activity relationships and pharmacokinetic properties including hepatic metabolism via CYP3A4.

DOI
3

Research Progress on Phytochemistry, Chemical Analysis, Pharmacology, and Pharmacokinetics of Peucedani Radix (2015)

Song YL, et al. Journal of Ethnopharmacology, 2015, 163: 1-29.

This review summarized that angular-type pyranocoumarins (particularly praeruptorins A, B, and E) are the main active components in Qian Hu. Crude extracts and pure compounds exhibited a wide spectrum of pharmacological activities including vasorelaxant, cardioprotective, hepatoprotective, antitumor, and anti-platelet aggregation effects.

PubMed
4

Anti-inflammatory Activity of Pyranocoumarins from Peucedanum praeruptorum in Murine Macrophages (2012)

Yu PJ, Jin H, Zhang JY, et al. Inflammation, 2012, 35: 967-977.

Praeruptorins C, D, and E isolated from the root significantly inhibited lipopolysaccharide-induced production of nitric oxide, interleukin-6, and tumor necrosis factor-alpha in murine macrophages. The mechanism involved inhibition of NF-kB and STAT3 signaling pathways.

DOI

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.