The function and efficacy of Hibiscus San is mainly to diarrhea fire and relieve stomach pain, and the specific use of the medicine is in accordance with the doctor’s prescription. Hibiscus San is a traditional Chinese medicine formula from volume 7 of the Primer of Medicine, which is mainly made of a hibiscus leaf (if there is a flower, it can be accompanied by a flower, and if there is a seed, it can be accompanied by a seed). In the Primer of Medicine, it is suggested that this formula can be used for treating stomach and epigastric pains due to the desire to move the fire (due to excessive thinking and worrying, and the desire not being fulfilled, which leads to the fire). In “Dong He Ba Guan – Miscellaneous Diseases”, it is suggested that this formula can be used to treat stomach pain, spontaneous sweating (involuntary sweating during the daytime, aggravated by the slightest movement of sweating), cheek-redness (redness of face and cheekbones), and disorganized pulse. Combined with the primary function analysis, this formula has the efficacy of diarrhea of fire to relieve pain. The contraindications to the use of this formula and the possible adverse reactions after use are not clear. Specific medication should be administered under the guidance of a specialist and should not be used without authorization.