There are differences in drug composition, efficacy, and main treatment between Angelica Si Reverse Tang and Si Reverse Tang. 1. Composition: Sihui Tang is composed of Radix Angelicae Sinensis, Radix et Rhizoma Glycyrrhizae, Radix et Rhizoma Glycyrrhizae. Danggui Siwei Tang is composed of angelica, peony, cinnamon sticks, fine Xin, Tongcao, jujube and licorice. 2. Efficacy: Si-Hui Tang has the efficacy of restoring yang to save the body (saving fainting and unconsciousness by warming yang qi). Angelica Sihui Tang has the effect of warming the menstruation, dispersing cold, nourishing blood and opening the veins. 3. Indications: Sihui Tang can be used for treating cold syncope of the limbs (unconsciousness, accompanied by cold limbs, even up to the elbows and knees) caused by yang failure of the heart and kidneys, curling up in bed with bad cold (fear of cold), weakness of the spirit and desire to sleep, pallor, abdominal pain and discharging of fluid, vomiting and lack of thirst. Angelica Si Reverse Tang can be used to treat coldness in the hands and feet due to blood deficiency and coldness, or pain in the waist, femur, leg, foot, shoulder and arm, and no thirst in the mouth. If there is a need for medication, it is recommended that it be used under the guidance of a professional physician to identify the symptoms, and not blindly self-medication.