| Objective:Houpu is a muti-effective and common herb. To clarify Houpu's compatible mechanism and to discuss all the factors guiding Houpu's varied functions in compound prescription, such as compatibility, processing, dosage, species, habitat and etc.Method:815 Houpu-containing formulae were collected from "Zhonghua Refined Presciption Dictionary". By analyzing the statistics, the law in applying to Houpu was summarized.Result:Some kinds of herbs, frequently combined with Houpu, are as follows:The first belongs to herbs to nourish weakness, then to ones to manage the spirit, to ones to dispel internal cold, the following is resolving dampness medicine. Houpu's compatibility structure, commonly contained, are as follows:Houpu with Zhishi, the one with Dahuang, the one with binglang and etc. The raw Houpu rarely goes into a kind of medicine. Most physicians of past generations believe Houpu should be processed with ginger, which has two purposes:the first is to eliminate the side-effect of raw Houpu irritating the throat, the second is to goes into the middle jiao and treat spleen and stomach diseases. According to ancient and modern studies on Houpu, the scientific processing method includes four steps:cutting, storage, processing with ginger, slicing. Houpu's dosage can be higher than the recommended dosage from Chinese Pharmacopoeia, owing to the fact that most physicians of past generations believe Houpu impairs body fluid and qi and the nature of modern Howpu is weaker than ancient Howpu. "Chuanpu" produced in Sichuan, hubei, shanxi are recognized genuine Houpu. Howpu Growing places and varieties have effects on quality and efficency.The effect of dosage guiding Houpu's varied functions in compound prescription is unobvious from the data that have been collected.Conclusion:all the factors, as the surroundings of compatibility, processing, species and habitat can deeply affect the functional direction of Houpu.
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