Exsiccated Sodium Sulfate Classic Formulas

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Purges heat and softens hardness - Xuan Ming Fen is used for severe heat-related constipation, dry stools, abdominal fullness, and focal hardness that need moistening and downward drainage.
Clears swelling and toxicity - dissolved or externally applied preparations are used for sore throat, mouth ulcers, swollen painful sores, and other inflammatory heat lesions.
Moistens dryness while draining - as a refined mirabilite-derived mineral, it helps draw water into the bowels and can be gentler in some preparations than crude saline purgation.

Tiao Wei Cheng Qi Tang - the classic bowel-heat formula whose mirabilite lineage best explains Xuan Ming Fen's purgative logic.
Da Cheng Qi Tang - an important reference for heat accumulation with hardness, fullness, and constipation.
Liang Ge San and related heat-clearing formulas reflect the mineral's traditional use for mouth, throat, and upper-burner heat with constipation.

IMPORT NOTE: Xuan Ming Fen is best understood within the Mang Xiao or mirabilite family rather than as a wholly separate therapeutic universe.
Traditional sources describe it as pungent-salty-cold, entering the bowels to purge heat while also being useful externally for sores and swelling.
Because it is a strong saline mineral, it is inappropriate in pregnancy or deficiency-cold conditions.