A woman, experiencing an external contraction coinciding with the onset of menstruation, suffered from alternating chills and fever, heart vexation, chest fullness, delirious speech with closed eyes, and lower abdominal pain. The condition persisted for six or seven days, during which several doses of Chinese medicinals were taken without effect. I diagnosed it as a syndrome of heat invading the blood chamber and prescribed Minor Bupleurum Decoction, using 12g of Bupleurum. Upon hearing this, another physician expressed concern that the dosage of Bupleurum was excessive and too dispersing, advising against its use. The patient's family was hesitant and sought my opinion again. I explained that the alternating chills and fever, along with heart vexation and chest fullness, could not be resolved without Bupleurum. I also referred to Chen Xiu-yuan's "The Subtle Use of Timely Formulas," which states, "In the formula, Bupleurum should be used in a small dose of four qian or a large dose of eight qian," to reassure them. I strongly advocated for its use, and the family, finally convinced, took the medicine. After just one dose, all symptoms were alleviated.