Mr. Mo, a 32-year-old male, suffered from a severe illness and was hospitalized for a week, diagnosed with "intestinal cold-damage disease." Upon examination, his complexion was sallow, his skin was filthy and turbid, his mental state was confused, he exhibited floccillation, had loose stools with blood, dark and scanty urine, a deep purple tongue texture, dry and cracked black coating, a pulse manifestation that was full, slow, and sluggish, and a body temperature of 39°C. His condition was critical, and efforts were made to treat him. He was urgently administered White Tiger Decoction, with gypsum used up to 150g, divided into five doses per day, which stabilized him after two days. On the third day, he became more agitated, and sedative medication was used. By the fourth day, his mental state slightly improved. On the fifth day, the bloody diarrhea stopped, the black coating gradually receded, his pulse became full, slow, and even, and his mental state fully cleared. The dosage of gypsum was then reduced to 120g per dose. By the ninth day, he had significantly improved, his appetite gradually returned, and the gypsum dosage was further reduced to 60g, continuing for two more days until he recovered.