Shennong's Classic of Materia Medica, also known as "Classic of Materia Medica" or "Classic of Materia Medica", is said to have originated from Shennong and passed down from generation to generation. Compiled into a book in the Eastern Han Dynasty, it was not written at the moment, nor was it written by one person. Many medical scientists in Qin and Han dynasties collected, summarized and compiled the monographs on pharmacological experience at that time, which was the first book in China to systematically summarize traditional Chinese medicine.
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Shennong's herbal classics formed the theoretical system of traditional Chinese medicine, which laid the foundation of traditional Chinese medicine, and a large number of herbal works in later generations were produced and developed on this basis. The original book has long been lost, and its main characters have been cited and recorded, and it is still preserved in books such as Zheng Bencao. All kinds of books published after the Ming Dynasty with the title of Shen Nong's Classic of Materia Medica are lost by later generations.
There are 365 kinds of drugs in the book, which are divided into upper, middle and lower categories except the general introduction of drugs. Among them, high-grade and middle-grade 120, low-grade 125.