Formula

Frigid Extremities Powder

四逆散si ni san
1 source

4 herbs·from Shanghan Lun (Treatise on Cold Damage)

In the Shanghan Lun (《傷寒論》) tradition, this formula is described for a Shaoyin (lesser-yin) presentation with counterflow cold of the limbs (sini), with variable signs such as cough, palpitations, inhibited urination, abdominal pain, or diarrhea with a heavy, dragging sensation in the rectum. A historical indication, not a modern diagnostic or treatment recommendation.

Source
传统主治（traditional context, not a modern clinical claim）：少陰病，四逆，其人或欬，或悸，或小便不利，或腹中痛，或泄利下重者，四逆散主之。…

Shanghan Lun (Treatise on Cold Damage)《伤寒论》辨少阴病脉证并治·四逆散（证治条文·宋本318）

References
  • Self-authored English rendering of the classical formula name (pinyin + sense translation); not a verbatim excerpt, no modern proprietary source.
Composition
  • Licorice十分（炙）
  • Immature Bitter Orange (Zhi shi)十分（破，水漬，炙乾）
  • Bupleurum (Chai hu)十分
  • Peony Root (Shao yao)十分
Citations
  • Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨少阴病脉证并治·四逆散（组成·宋本318）Cited from Shanghan Lun (Treatise on Cold Damage) for its composition.
  • Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨少阴病脉证并治·四逆散（证治条文·宋本318）；hash 锚 carrier 逐字唯一片段（含方名/组成上下文）Cited from Shanghan Lun (Treatise on Cold Damage) for its traditional indications.
  • Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨少阴病脉证并治·四逆散（煎服法·宋本318）Cited from Shanghan Lun (Treatise on Cold Damage) for its preparation & usage.