Mang Xiao (Natrii Sulfas)

Mang Xiao (芒硝), mirabilite (sodium sulfate), purges accumulation and softens hardened stool, and drains heat; it is also used topically to reduce swelling.

Máng Xiāo  ·  芒硝

Latin / Pharmaceutical Name

Natrii Sulfas (mirabilite)

Common English Name

Glauber's salt / mirabilite

Taste

Salty, bitter

Temperature

Cold

Channels Entered

Stomach, Large Intestine

Actions & Functions

  • Purges accumulation and softens hardened, dry stool
  • Clears heat and reduces swelling (topical, e.g. breast distension)

Indications

Constipation with hard, dry stool and heat; and (topical) swollen, painful breasts and skin swellings.

Dosage

6-12 g, dissolved in the strained, hot decoction (not boiled).

Common Combinations

With Da Huang to soften stool and drain heat (Da Cheng Qi Tang).

Cautions & Contraindications

Contraindicated in pregnancy; avoid in cold from deficiency.

About Attilio

Doctor of Chinese medicine, acupuncture expert and author of My Fertility Guide and My Pregnancy Guide.

Check Also

PubMed research

Acupuncture Shows Sustained Benefits for Chronic Daily Headache Prevention in Adults, Meta-Analysis Finds

Research summary (Acupuncture): Utility of Acupuncture Therapy for Adult Chronic Daily Headache Prophylaxis: A Systematic Review and Meta-Analysis. - Medical science monitor : international medical journal of experimental and clinical research, 2026.