取妇人阴部附近区域的头发，剪碎后烧成灰。用水调和，服用一方寸匕的量。每日服用三次。小便通畅后，阴头轻微肿胀即痊愈。
如果是男子患病，则取男子的头发烧成灰使用。
经书云：伤寒病阴阳易这种病症，患者身体沉重，气短乏力，小腹部拘急疼痛，或者牵引阴部拘挛抽搐，热气上冲至胸部，头部沉重难以抬起，眼中生花，膝盖和小腿拘急不舒的，此方主治。按大病刚刚痊愈，体内余邪未尽，此时强行行房事，男女二气相互感应，导致疾病互相传染。推究其病本，病邪从前阴侵入，仍应当引导病邪，使其从前阴排出。所以必须等到小便通畅后才算痊愈。方中单用烧焦的头发一味药，取其气味相感、以类相从的原理。这是古时流传的禁秘之方，有些效果令人不可思议，大抵都是类似的情况。
Take hair from the area near the female genitalia, cut it into pieces, and burn it to ash. Mix with water and administer one *cun* cube (a traditional Chinese volume measure) per dose. Administer three times daily. When urination becomes smooth and slight swelling occurs at the glans penis/vulva, the patient will recover.
If the patient is male, take male hair and burn it to ash for use.
The Classics state: Regarding the disease of "Yin-Yang Exchange" (mutual transmission of pathogenic factors after sexual intercourse following a febrile disease), the patient experiences heavy body sensation, shortness of breath, urgency and tension in the lower abdomen, or spasms drawing into the genital region, heat rushing up to the chest, heaviness of the head making it difficult to lift, visual disturbances (seeing spots), and stiffness/spasms of the knees and calves. This formula is indicated for such cases. According to analysis, when a major illness has just resolved but residual pathogens remain, engaging in sexual intercourse causes the Qi of both parties to interact, leading to mutual transmission of the disease. Investigating the root of the pathology, the pathogen enters via the anterior yin (genitals); therefore, it is necessary to guide the pathogen out through the same route. Thus, recovery is only achieved once urination is unobstructed. The formula uses only calcined hair as a single ingredient, relying on the principle that substances with similar affinities attract each other ("like responds to like"). These are ancient secret formulas whose efficacy is often beyond ordinary comprehension; they generally follow this pattern.