Mirabilite

Mangcho (Glauber's salt), the cold salt that melts hardness

The 《Shennong Bencao Jing》 describes Mangcho as having a "bitter taste and cold nature. It treats a hundred diseases, removes heat and cold pathogenic factors, and expels accumulations and hard masses in the six fu organs. It can dissolve 72 types of stones." While the expression "dissolving 72 types of stones" may sound like an exaggeration, the meaning changes when considering that Mangcho is a mineral medicine. This medicinal material is sodium sulfate decahydrate (Na₂SO₄·10H₂O) obtained by refining the sulfate mineral Mirabilite; it is a cold crystal that weathers easily in the air and dissolves in its water of crystallization at 33°C. The effect of 'Yeon-gyeon' (軟堅), softening the hard, mentioned in classical texts appears to be an expression derived from these physical and chemical properties.

Mangcho is commonly known only as a "constipation remedy," but its actual role is much narrower and more precise. The 《Yaozheng》 summarizes it in one line: "Mangcho primarily focuses on Yeon-gyeon (softening hardness). Therefore, it treats epigastric fullness and hardness (Sim-ha-goe-gyeon), epigastric stone-like hardness (Sim-ha-seok-gyeong), acute lower abdominal tension (So-bok-geup-gyeol), chest binding (Gyeol-hyung), and hard stools due to dryness (Jo-sa-dae-byeon-gyeong)." The key here is not simply "inducing bowel movements," but "softening and passing things that are blocked, hard, and rigid." This is echoed in the explanation by Seong Mu-gi in the 《Bencao Gangmu》: "The 《Neijing》 states that the salty taste descends to become Yin and softens the hard. Therefore, Zhang Zhong-jing used Mangcho in Dae-ham-hyung-tang, Dae-seung-gi-tang, and Jo-wi-seung-gi-tang to soften hardness and remove excess heat (Yeon-gyeon-geo-sil)." Mangcho is not a simple purgative, but a medicinal material that unravels hardness caused by heat using cold and salty power.

However, this cold power is a double-edged sword. Mangcho is a strong purgative (Gong-ha-yak); it is contraindicated for pregnant women and unsuitable for patients with Spleen and Stomach Deficiency-Cold (Bi-wi-heo-han). The Hong Kong Department of Health has even reported cases of poisoning where sodium nitrite (Ya-cho) was mistaken for Mangcho, showing that confusion with substances of similar names and forms is dangerous. Therefore, the key when using Mangcho is "how much, for whom, and how." The method of 'Chung-bok' (dissolving it into the decoction of other herbs at the end), the medicinal pairing with Rhubarb (Dae-hwang) to enhance the effect of purging heat and softening hardness, and the potential for dehydration and electrolyte imbalance in case of overdose must all be determined within the context of the prescription. Mangcho is not a tea or food that one can choose to consume on their own. This page deals specifically with those boundaries of use.

Summary at a Glance

This table summarizes the identity and core characteristics of Mangcho at a glance. It includes everything from its origin to its properties and precautions, so those seeing it for the first time can quickly grasp the general flow.

Category	Content
Origin	Hanja Name 芒硝 / Scientific Name (Unknown). It is a sodium sulfate decahydrate (Na₂SO₄·10H₂O) crystal obtained by refining the sulfate mineral Mirabilite.
Properties and Meridian Tropism	The taste is salty, bitter, and cold (辛·苦·鹹, 大寒), and its nature is very cold. It acts on the Stomach Meridian, Large Intestine Meridian, and Triple Energizer Meridian.
Representative Aliases	Bun-cho, Ma-a-cho, Bak-cho, Yeong-so, Pung-hwa-so, etc.
Efficacy Recorded in Literature	Purging heat and promoting bowel movements (Sa-yeol-tong-byeon): lowering heat to clear abdominal constipation. Moisturizing dryness and softening hardness (Yun-jo-yeon-gyeon): softening dry and hard masses. Clearing heat and reducing swelling (Cheong-ha-so-jong): cooling heat and calming edema.
Main Ingredients	Sodium sulfate (Na₂SO₄). 99.0% or more on a dried basis, according to the Korean Herbal Medicine (Crude Drug) Standards outside the Korean Pharmacopoeia.
Combination & Precautions	When used with Rhubarb, the effects of purging heat and softening hardness are enhanced. Cannot be used with Sulfur, Sanling, or Kusen. Since its action is the exact opposite of tonic medicines for supplementing Yang or Yin, self-combination should be avoided. Use is contraindicated for pregnant women and those with Spleen and Stomach Deficiency-Cold (Bi-wi-heo-han).

Is this medicinal herb right for me?

Since Mangcho is a mineral medicine with a strong purgative effect, its suitability varies greatly depending on the individual's constitution and symptoms. You can first gauge it based on the following three criteria.

• Generally suitable cases: Cases judged as an Excess-Heat (Sil-yeol) constitution, characterized by severe constipation, a hard-feeling abdomen, a red face, and a dry mouth. A Korean medicine doctor may prescribe Mangcho in combination with Dae-seung-gi-tang, Jo-wi-seung-gi-tang, or Dae-ham-hyung-tang.
• Cases requiring caution: Those who usually have a weak stomach or frequent diarrhea, the elderly or frail, those concerned about electrolyte imbalance, or those taking Western medications. Mangcho should be used with caution as its purgative action may be offset by anticholinergics such as atropine.
• Cases to avoid: Pregnant women, patients with Spleen and Stomach Deficiency-Cold (Bi-wi-heo-han), or those attempting to use strong purgatives on an empty stomach or through self-administration. Mangcho has uterine-contracting properties, posing a risk of miscarriage for pregnant women, and excessive doses can cause violent diarrhea, abdominal pain, dehydration, and electrolyte abnormalities.

An accurate determination must be made through a Korean medicine doctor's examination, including abdominal and verbal consultation. As Mangcho is a prescription drug and a strong purgative, it is safer to confirm its suitability through a consultation rather than starting it on your own just because you have symptoms.

Practical Q&A

Mangcho is known as a medicinal material that relieves constipation or abdominal hardness, but in reality, "who, when, and how" are very important. We have selected frequently asked questions from medical consultations and will answer them based on verified facts.

"Can I take Mangcho if I have constipation?"

Not all constipation is suitable for Mangcho. Mangcho has traditionally been used when stools are hard, the abdomen feels hard to the touch, and there is a significant accumulation of heat, that is, Excess Pattern (Sil-jeung)when these conditions are present. Conversely, it may cause problems for those with a weak constitution, a cold stomach, the elderly, or patients with chronic constipation. If the cause of constipation is lack of moisture, lack of exercise, or drug side effects, Mangcho may not be appropriate. Therefore, it is necessary to first distinguish the nature of the constipation through a consultation with a Korean medicine doctor.

"Why is it used together with Daehwang (Rhubarb)?"

Mangcho (Glauber's salt) is a representative combination used with Daehwang to enhance its effects. In prescriptions such as Daeseunggitang, Jowiseunggitang, and Daehamhyungtang from the Sanghanron (Treatise on Cold Damage), Mangcho is used alongside Daehwang. It can be understood that Daehwang sweeps away accumulated heat, while Mangcho works to soften hardened masses. However, as this combination is a strong purgative prescription, it must be used only under the prescription of a professional.

"Can it be used during pregnancy?"

Use is contraindicated for pregnant women. Mangcho has uterine-contracting properties, which may lead to concerns regarding miscarriage; official records from Korea, China, and Hong Kong all specify that use in pregnant women is contraindicated or should be used with extreme caution. It is absolutely dangerous to self-administer Mangcho for constipation during pregnancy.

"Can I boil it as a tea?"

Unlike general herbal medicine ingredients, Mangcho is not boiled for a long time. The common method is to dissolve Mangcho into the herbal extract after other ingredients have been decocted, a method known as Chungbok (dissolving in liquid)This is common. This is because prolonged heating can cause the loss of water of crystallization, which may alter its efficacy. Therefore, when Mangcho is included in a prescription, the preparation method and the order of administration are important.

"Can I take it with restorative herbal medicine?"

Mangcho and restorative medicines (Boyak) such as Gongjindan, Gyeongokgo, and Bojungikgitang have opposite directions of action. Mangcho is a purging (Sa) medicine, while restorative medicines are supplementing (Bo) medicines. While there are theoretical cases where purging and supplementing are used together, the strong purgative action of Mangcho can interfere with the absorption of restorative medicines and may damage the spleen and stomach. Therefore, as a general rule, Mangcho should not be self-added while taking restorative medicine. If combined use is necessary, a Korean medicine doctor will decide after determining whether the patient has an excess (Sil) or deficiency (Heo) pattern.

"What should I do if diarrhea or dizziness occurs after taking it?"

Since Mangcho is a strong purgative, taking excessive amounts or using it for an inappropriate constitution may cause severe diarrhea, abdominal pain, dehydration, lethargy, palpitations, and muscle spasms due to electrolyte imbalance, and in severe cases, arrhythmia. Additionally, nausea or vomiting may occur if taken on an empty stomach or in large quantities. If these symptoms appear, it is safe to stop administration immediately and visit a nearby medical institution.

Relationship with Other Medicinal Herbs (Yakdae/Pairing)

Mangcho is not used alone. Its characteristics become clear the moment it is paired with other medicinal herbs, which is traditionally called "Yakdae (medicinal pair)." In particular, when Mangcho meets Daehwang, it is a representative combination where the effects of clearing heat (Sayeol) and softening hardness (Yeongyeon) reinforce each other. Below are the confirmed prescriptions and combination relationships.

• Mangcho + Daehwang (Rhubarb) — Daeseunggitang: A prescription recorded in the Sanghanron, traditionally used with Daehwang, Jishil, and Hubak for acute excess patterns of cold damage, severe heat, severe excess, severe fullness, and constipation. Here, Mangcho serves to soften hardened masses and drive heat downward.
• Mangcho + Daehwang + Gamcho (Licorice) — Jowiseunggitang: A Sanghanron prescription where Gamcho adds harmony to the strong purgative action of Daehwang and Mangcho. It has been traditionally used for severe constipation, abdominal fullness, tidal fever, and urinary retention.
• Mangcho + Daehwang + Gamsu (Jesuit's Bark/Gelsemium) — Daehamhyungtang: A Sanghanron prescription used for chest binding syndrome and fullness and pain in the epigastrium and lower abdomen. Mangcho is combined to soften hardness, while Gamsu serves to expel water-dampness.
• Mangcho + Daehwang + Doin (Peach Kernel) + Gyeji (Cinnamon Twig) + Gamcho — Dohaekseunggitang: A prescription from the Shanghanlun, traditionally used when Taiyang disease is not resolved and blood stasis has descended.
• Mirabilite + Rhubarb + Peach Kernel + Winter Melon Seed + Moutan Bark — Daehwangmodantan-tang (Daehwang Modan Decoction): A prescription from the Geumgwe-yoryak, used for intestinal abscesses and swelling in the lower abdomen.

Combination Contraindicationsmust be kept in mind.

• Sulfuris contraindicated as combined use may cause severe intestinal spasms or strong purgative reactions.
• Sanling (Spathiphyllum)is not combined because chemical changes may occur, altering the medicinal properties.
• Sophora Flavescenscombined use also needs to be verified. Please inquire during your consultation.

In what form is it consumed?

Mirabilite is not a medicinal herb to be consumed as a general food or in tea form. As it is a mineral medicine and a strong purgative, the method and timing of administration vary accordingly. Here is a candid summary of the four verified forms of use.

• Drinking as tea: This is uncommon. Mirabilite is not an ingredient for edible tea, and due to its strong purgative effect, consuming it dissolved in water is not recommended without a prescription from a Korean medicine doctor.
• Adding to food: This is uncommon. It is not a medicinal herb used as a seasoning or food ingredient.
• Adding to decoction: applies. However, mirabilite itself is not boiled for a long time. The method is to first decoct the other herbs and then dissolve mirabilite into the resulting decoction before taking it, which is 沖服This is common. Since prolonged heating can cause the loss of crystal water and alter its efficacy, the principle is to add and dissolve it at the very end, just before heating is finished.
• Korean medicine clinic prescription: applies. Mirabilite is a powerful purgative and carries risks such as contraindication for pregnant women, electrolyte imbalance, and uterine contractions; therefore, it must be used under the prescription of a Korean medicine doctor. Self-administration is not recommended.

Interactions and Safety During Use

Since mirabilite is a mineral medicine with a strong purgative effect, its safety is directly linked to which medicinal herbs, foods, or symptoms it interacts with. Below are the verified interactions and contraindications.

Cases requiring caution during combined use

• Sulfur: When used in combination with Mirabilite, violent intestinal spasms or strong purgative reactions may occur, and in severe cases, there is a risk of sulfide poisoning; therefore, they are not used together.
• Samyung (Sparganium): It is not combined because it may react chemically with Mirabilite, potentially altering its medicinal properties.
• 苦參: It is recorded as a contraindicated combination in Chinese medical information resources.
• Anticholinergics such as Atropine: Combination is avoided as it may inhibit the laxative effect of Mirabilite.
• Daehwang (Rhubarb): While it is a representative combination for Mirabilite, as traditional records state that "Rhubarb is used as the guiding herb," the effects of purging heat and softening hardness are significantly enhanced when these two herbs meet. For this reason, taking them together without a doctor's judgment may lead to excessive diarrhea or electrolyte imbalances.

Contraindications for Use

• Pregnant women: Official data from Korea, China, and Hong Kong all specify that use is contraindicated or should be used with caution for pregnant women. There is a risk of abortion due to the uterine-contracting effect of Mirabilite.
• Patients with Spleen and Stomach Deficiency-Cold: It is not used for those with a constitution where the spleen and stomach are deficient and cold.
• Weak individuals: It is also unsuitable for those who are generally weak or in a state where dehydration is a concern.

Warning Signs After Administration

Sodium sulfate, the main component of Mirabilite, increases osmotic pressure in the intestines to draw in water and promote intestinal peristalsis. If taken in excessive or inappropriate amounts, the following symptoms may occur:

• Violent watery stools and abdominal pain
• Dehydration due to frequent diarrhea (dry mouth, decreased urination, reduced skin elasticity)
• Electrolyte imbalance (lethargy, palpitations, muscle spasms, arrhythmia)
• Nausea and vomiting
• Uterine contractions in pregnant women

If these symptoms appear, stop taking the medicine immediately and visit a nearby medical institution.

Guidance

Mirabilite is a medicinal herb where "who, when, and how" are critically important. It cannot be used by anyone simply because they have constipation; it is used only in cases of excess patterns (Sil-jeung) under the prescription and supervision of a doctor of Korean medicine. If you are curious about prescriptions containing Mirabilite or its combination with other herbs, please ensure it is appropriate for your constitution and symptoms through a consultation.

If you experience these symptoms

Because Mangcho (Glauber's salt) is a mineral medicine with strong laxative effects, if the following signs appear during intake, do not simply dismiss them as 'the medicine is working' and notify your attending Korean medicine doctor immediately. In particular, if diarrhea recurs or signs of electrolyte imbalance appear, simply reducing or stopping the dose on your own may not be sufficient.

• Diarrhea and Abdominal Pain: Overdose may cause severe watery stools and abdominal pain. This is a reaction related to the contraction of the intestinal smooth muscles.
• Dehydration: Frequent diarrhea may lead to dry mouth, decreased urine output, and loss of skin elasticity.
• Electrolyte Imbalance: Loss of sodium, potassium, and chloride may cause lethargy, palpitations, muscle spasms, or arrhythmia.
• Nausea and Vomiting: These may occur due to gastrointestinal irritation when taken on an empty stomach or in large doses.
• Uterine Contraction: Mangcho has uterine-contracting properties, which may pose a risk of miscarriage; therefore, it must never be used by pregnant women.

If the above symptoms appear, stop taking the medicine. It is safe to visit an emergency medical institution, especially if accompanied by severe dehydration, decreased consciousness, difficulty breathing, severe abdominal pain, or if there is a possibility of pregnancy.

Differences from other restorative medicines

Mangcho is a medicinal ingredient that traditionally acts in the direction of 'purging' (Sa). Since it is used to push out accumulated heat and hardened materials from the body, its nature is the exact opposite of restorative medicines (Boyak) that fill the body's nourishing energy. Restorative prescriptions such as Gongjindan, Gyeongokgo, and Bojungikgi-tang are formulated to supplement a deficient constitution or replenish energy; Mangcho is not suitable for self-administration alongside these prescriptions.

Specifically, the strong laxative action of Mangcho can disrupt the conditions necessary for restorative medicines to work slowly and may place a burden on long-term digestive functions. While Korean medicine clinical practice sometimes considers both 'purging' and 'nourishing' simultaneously, this is done by a professional who adjusts the ratio and timing of the prescription after accurately distinguishing between the patient's excess (Sil-jeung) and deficiency (Heo-jeung) patterns. For example, a sequence is set to first resolve an urgent excess pattern and then nourish the body; generally, taking Mangcho while taking restorative medicine is not recommended.

Therefore, it is safer to determine whether Mangcho or a restorative medicine is more appropriate through a consultation with a Korean medicine doctor rather than judging for yourself. Having a hard abdomen and constipation does not automatically mean Mangcho is the answer; if the digestive system is weak or other symptoms are intertwined, a different approach may be more appropriate. During your consultation at Baekrokdam Korean medicine clinic, we will examine your symptoms and constitution together and provide prescriptions and dosage instructions only if Mangcho is necessary.

References

1. Mangcho Reference Material 1: koreantk.com evidence materials.
2. Mangcho Reference Material 2: koreantk.com evidence materials.
3. Mangcho Reference Material 3: koreantk.com evidence materials.
4. Mangcho Reference Material 4: Korea Citation Index academic paper.
5. Mangcho Reference Material 5: Korea Citation Index academic paper.
6. Mangcho Reference Material 6: docs.waglewagle.net Evidence.
7. Mangcho Reference Material 7: health.kr supporting data.
8. Mangcho Reference Material 8: herba.kr evidence.

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If you would like to check if this medicinal herb is right for you or which prescription it should be used with, please leave a medical inquiry. For those who find it difficult to visit the clinic, non-face-to-face consultations are available; we will provide guidance after first reviewing your current condition and current medications.