Formula
Resistance Pill
抵當丸di dang wan
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 cold-damage illness with heat and lower-abdominal fullness where, although urination would be expected to be inhibited, it is instead uninhibited — taken as a sign of static blood. A historical indication, not a modern diagnostic or treatment recommendation.
Source
传统主治（traditional context, not a modern clinical claim）：傷寒有熱，少腹滿，應小便不利，今反利者，爲有血也，當下之，不可餘藥，宜抵當丸。…
Shanghan Lun (Treatise on Cold Damage)《伤寒论》辨太阳病脉证并治·抵當丸（证治条文·宋本126）
References
- Self-authored English rendering of the classical formula name (pinyin + sense translation); not a verbatim excerpt, no modern proprietary source.
Composition
- Leech (Shui zhi)二十箇
- Gadfly (Fei meng)二十箇
- Peach Kernel (Tao ren)二十五箇
- Rhubarb Root三兩
Citations
- Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨太阳病脉证并治·抵當丸（组成·宋本126）Cited from Shanghan Lun (Treatise on Cold Damage) for its composition.
- Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨太阳病脉证并治·抵當丸（证治条文·宋本126）；hash 锚含方名/组成唯一上下文片段Cited from Shanghan Lun (Treatise on Cold Damage) for its traditional indications.
- Shanghan Lun (Treatise on Cold Damage) · Zhang Zhongjing · 《伤寒论》辨太阳病脉证并治·抵當丸（煎服法·宋本126）Cited from Shanghan Lun (Treatise on Cold Damage) for its preparation & usage.