Bitter Apricot Seed and Mulberry Root Bark Decoction for Lung Heat Cough

Introduction to Medicinal Food

Bitter Apricot Seed and Mulberry Root Bark Decoction (Kuxingren Sangbaipi Tang) is a classic medicated dietary formula originating from Traditional Chinese Medicine (TCM)食疗学 (food therapy), validated through centuries of clinical experience. It skillfully combines the descending qi and arresting cough action of Semen Armeniacae Amarum (Bitter Apricot Seed) with the clearing lung and draining heat effect of Cortex Mori (Mulberry Root Bark). This decoction possesses an elegant aroma and a taste that is slightly bitter and acrid with a lingering sweetness. It may be consumed both as a daily health-supporting soup and as an auxiliary regulation measure when symptoms such as lung heat cough (feire kesou) or qi counterflow dyspnea (qi ni chuanxi) arise. This formula fully embodies the TCM principle of “homology of medicine and food” (yao shi tong yuan), achieving a perfect integration of medicinal substances and food ingredients, allowing individuals to savor the broth while simultaneously nurturing health.

In classical Chinese medical texts, the combination of Semen Armeniacae Amarum (bitter apricot seed) and Cortex Mori (mulberry root bark) appears frequently, with similar pairings found in classics such as *Shang Han Lun* and *Wen Bing Tiao Bian*. This soup formula centers on clearing the Lung and descending Qi, and is particularly adept at addressing various respiratory discomforts caused by Lung-Heat congestion or rebellious Lung Qi. Unlike the simple use of chemical antitussives, the Bitter Apricot Seed and Mulberry Root Bark Decoction focuses on fundamentally regulating the Lung’s dispersing and descending functions, helping to restore Qi dynamic balance, thereby alleviating symptoms and improving constitution. Its medicinal nature is balanced and mild, making it suitable as an adjunctive dietary therapy for conditions such as chronic cough and bronchitis, under the guidance of a professional TCM practitioner.

Efficacy of Medicated Diet

The primary effects of Ku Xingren Sangbaipi Tang (Bitter Apricot Seed and Mulberry Root Bark Decoction) are to clear heat and transform phlegm, as well as to stop cough and calm panting. It has a notable alleviating effect on symptoms caused by lung heat, such as cough, yellow and thick expectoration, sore throat, chest oppression, and shortness of breath. This formula helps to clear stagnant heat from the lung, thin the phlegm, and facilitate its expectoration, thereby reducing airway obstruction and irritation. Additionally, this decoction also possesses a certain effect of moistening the intestines and promoting bowel movements, making it especially suitable for individuals with lung heat cough accompanied by dry stools. This reflects the TCM theory that “the lung and large intestine are interior-exteriorly related.”

In addition to direct symptomatic treatment, Ku Xingren Sang Baipi Tang (Bitter Apricot Seed and Mulberry Root Bark Decoction) also serves a preventive health care function. During dry weather, periods of heavy haze, or seasonal transitions, moderate consumption of this decoction can enhance the lung’s defensive capacity (wei qi) and reduce the likelihood of invasion by external pathogens. It nourishes lung yin and descends lung qi, promoting smoother and deeper breathing. For individuals who are long-term smokers, those with vocal overuse, or those working in dusty environments, this decoction helps clear accumulated heat in the lung, alleviating discomforts such as dry throat and itchy throat. With consistent consumption over a period of time, it can markedly improve the overall health of the respiratory system.

The Role of Traditional Chinese Medicine

According to the theory of property, flavor, and meridian tropism in Traditional Chinese Medicine, *Prunus armeniaca* (Bitter Apricot Seed, *Kuxingren*) is bitter in flavor, slightly warm in nature, with minor toxicity, and enters the Lung and Large Intestine Meridians. Its primary functions are to descend qi, relieve cough, calm wheezing, and moisten the intestines. In the formula, it serves as the sovereign (principal) herb, specifically targeting cough and dyspnea due to rebellious lung qi, achieving cough relief by descending and settling the lung qi. *Morus alba* (Mulberry Bark, *Sangbaipi*) is sweet in flavor, cold in nature, and enters the Lung Meridian; it drains the lung, calms wheezing, promotes urination, and reduces edema. As the minister (secondary) herb, it assists *Kuxingren* in jointly clearing and draining excess heat from the lung. The combination of these two herbs—one warm, one cold—balances and coordinates with each other, ensuring that the entire formula is cooling without being excessively cold, and descending without damaging, thus avoiding the deviations of using a single herb alone.

The mechanism of this medicinal food is also reflected in its dual regulation of “phlegm” (痰) and “qi” (气). According to TCM, “the lung is the container for phlegm” (肺为贮痰之器): when lung heat refines fluids into phlegm, the phlegm obstructs the airway, leading to persistent cough and dyspnea. The Decoction of Semen Armeniacae Amarum (Bitter Apricot Seed) and Cortex Mori (Mulberry Root Bark) can both clear lung heat and eliminate the source of phlegm through Cortex Mori, and also descend qi and transform phlegm to relieve existing phlegm obstruction via Semen Armeniacae Amarum. At the same time, the moistening intestine effect of Semen Armeniacae Amarum guides lung heat downward through the large intestine (大肠) for excretion, providing an outlet for pathogenic heat. This combined strategy of “removing firewood from under the cauldron” (釜底抽薪) and “giving the pathogen an outlet” (给邪出路) precisely embodies TCM’s holistic pattern differentiation thinking (整体辨证思维) and is the fundamental reason for the enduring popularity of this medicinal food.

Indications

Patients with Lung-Heat Cough

This decoction is suitable for individuals presenting with Lung Heat pattern, characterized by frequent coughing, thick yellow phlegm, red and swollen sore throat, dry mouth with a preference for cold drinks, fever, and irritability. It can be used as an adjunctive therapy under medical guidance for heat-related coughs caused by acute bronchitis, acute exacerbation of chronic bronchitis, or upper respiratory tract infections.

In cases of Lung Qi ascending counterflow

For individuals presenting with symptoms of rebellious lung qi, such as asthma, chest tightness, shortness of breath, and prolonged expiration—including those with mild asthma or asthmatic bronchitis—the Lung-Descending and Asthma-Relieving action of Kuxingren Sangbaipi Decoction (Bitter Apricot Seed and Mulberry Root Bark Decoction) can help alleviate discomfort and improve respiratory rhythm. Additionally, this formula is well-suited for people with lung qi consumption and dissipation, as well as deranged qi movement, often caused by long-term smoking or excessive voice use.

Those with Intestinal Dryness Constipation

This is suitable for individuals with lung heat cough accompanied by dry stools and difficult defecation. Apricot kernel (Semen Armeniacae Amarum) is rich in oils, which can moisten the intestines and promote bowel movements, addressing both cough and constipation simultaneously—a twofold benefit. It is especially appropriate for elderly, frail, or post-illness cough patients with fluid depletion. However, dosage should be carefully monitored to avoid excessive laxative effect.

Contraindicated populations

Contraindicated for those with Deficiency-Cold cough.

For cases of cough with thin white sputum, aversion to cold and cold limbs, tastelessness without thirst, and loose stools—patterns that correspond to deficiency-cold or wind-cold cough—this formula should not be used. The reason is that Sang Baipi (Morus alba root bark) is cold in nature, and while Ku Xing Ren (Prunus armeniaca, Bitter Apricot Seed) is slightly warm, the overall tendency of the formula remains cooling, which would aggravate the cold pattern, potentially causing the cough to persist or even worsen. For such individuals, medicinal diets that warm and transform cold-phlegm while diffusing the lung and stopping cough should be selected, such as Shengjiang Hongtang Shui (fresh ginger and brown sugar water) or Chenpi Banxia Tang (tangerine peel and Pinellia ternata decoction).

Use with caution in individuals with Spleen and Stomach Deficiency Cold Pattern.

Patients with a weak Spleen and Stomach constitution who frequently experience abdominal distension and pain, poor appetite, and loose stools should use Morus alba root bark (mulberry root bark) with caution, as its cold nature may impair Spleen yang and affect the functions of transportation and transformation. If its use is necessary, warming ingredients such as Zingiber officinale (ginger) and Ziziphus jujuba (jujube) may be added to counteract its cold property, or the dosage may be reduced and the duration of administration shortened. Pregnant women, children, and those with extreme constitutional weakness must use it only after weighing the benefits and risks under the guidance of a professional TCM practitioner.

Individuals with apricot seed allergy and special constitution.

Individuals with a known allergy to Apricot Seed (Semen Armeniacae Amarum) or Mulberry Root Bark (Cortex Mori) should strictly avoid their use. Bitter Apricot Seed contains amygdalin; excessive use may lead to toxic reactions such as dizziness, nausea, and dyspnea. Therefore, the daily adult dosage should not exceed 10 grams, and it must be decocted thoroughly to neutralize the toxic components. It should also be used with caution in patients with hepatic or renal insufficiency to avoid increased metabolic burden. Additionally, individuals concurrently taking other antitussive or antihypertensive medications are advised to consult a physician to avoid potential drug interactions.

Ratio of ingredients in a formula

Bitter Apricot Seed (*Semen Armeniacae Amarum*) 9 g (must be pounded to facilitate release of active constituents). Mulberry Root Bark (*Cortex Mori*) 12 g (may be honey-fried or used raw; honey-frying reduces cold nature slightly, enhancing cough-suppressing effect). Honey or rock sugar, as needed (to harmonize the medicinal taste and improve palatability). Clear water 800 ml (approximately 3–4 cups of water). This is the daily dose for one person. Continuous use should not exceed 5 days; consult a Chinese medicine practitioner if continued use is desired.

In terms of formula composition, fine adjustments can also be made according to individual constitution. If cough with profuse phlegm is prominent, add 6g of *Fritillaria thunbergii* (Zhejiang Fritillary) and 9g of *Trichosanthes kirilowii* pericarp (Snakegourd Peel) to strengthen the phlegm-resolving effect; if severe sore throat is present, add 6g of *Arctium lappa* (Great Burdock Achene) and 6g of *Platycodon grandiflorus* (Balloon Flower Root) to benefit the throat and restore the voice; if accompanied by marked dyspnea, add 6g of *Magnolia officinalis* (Magnolia Bark) and 9g of *Perilla frutescens* seed (Perilla Seed) to assist in descending qi and relieving dyspnea. All modifications should be carried out under professional guidance; do not alter the formula arbitrarily on your own, as this may affect the therapeutic effect or cause adverse reactions.

Preparation Method

Step One: Preparation and Pre-treatment

Place bitter apricot seed (Semen Armeniacae Amarum) in clean water to soak for 30 minutes, then remove and crush or grind into coarse powder to facilitate the extraction of active ingredients. Quickly rinse white mulberry root bark (Cortex Mori) in clean water to remove surface dust, cut into small sections, and set aside. Prepare a clay pot or ceramic pot, avoiding iron or aluminum cookware to prevent the herbs from reacting with the metal and affecting the medicinal efficacy.

Step 2: Decoction

Place the processed crushed bitter apricot seeds (Semen Armeniacae Amarum) and sliced mulberry root bark (Cortex Mori) together in a pot. Add 800 ml of purified water. Let it soak for 20 minutes, then bring to a boil over high heat. Once boiling, reduce to low heat and simmer gently (keeping a slight rolling boil) for 25–30 minutes. During decoction, avoid opening the lid frequently to minimize loss of volatile components. When the liquid has reduced to approximately 300 ml (about 1.5 bowls), turn off the heat and let it sit without disturbing.

Step 3: Filter the Residue and Adjust the Flavor

Use a fine mesh strainer or cheesecloth to filter out the herbal residue, then pour the clear decoction into a bowl. While it is still warm, add an appropriate amount of honey or rock sugar, stirring until dissolved. Note: Honey should not be added at high temperatures to avoid destroying its nutritional components; it is recommended to wait until the decoction has cooled to below 60°C before adding. After stirring well, it can be consumed in divided doses 2–3 times daily, approximately 100 ml per dose. For best results, take it on an empty stomach one hour before or after meals, while the decoction is still warm.

Tips for Consumption

1. During the period of consumption, avoid spicy, greasy, raw/cold, and fishy hair-raising foods (fa wu), such as chili, fatty meats, ice cream, and seafood. These foods can irritate the respiratory tract, aggravate phlegm-heat symptoms, and reduce the efficacy of the medicinal food. It is also recommended to drink plenty of warm water to help thin phlegm and promote the elimination of toxins.

2. Bitter apricot seed (Semen Armeniacae Amarum) contains trace amounts of cyanogenic glycosides. Although most are destroyed during decoction, excessive doses or prolonged continuous use should still be avoided. It is recommended to discontinue for 2 days after every 3-5 consecutive days of use to allow for metabolic adjustment. If symptoms such as dizziness, fatigue, or nausea (suspected toxicity) occur, discontinue immediately and seek medical attention.

3. This medicinal food is best consumed during the daytime, and preferably avoided before bedtime, as Cortex Mori (Mulberry Root Bark) has a certain diuretic effect; taking it at night may lead to increased nocturia and affect sleep quality. The optimal times for consumption are in the morning on an empty stomach and between 3 PM and 5 PM. These two periods correspond respectively to the peak qi and blood activity of the Lung Meridian (LU) and the Large Intestine Meridian (LI), which facilitates the release and absorption of the medicinal properties.