What is the largest existing prescription book in ancient China?

Pujifang

The largest work of prescription science in the history of China, including 6 1739 volumes of Fang Jingda's works. Puji prescription works. 168. Ming. , Zhou,, Teng Shuo, etc. Published at the beginning of15th century. It is a large-scale medical prescription compiled in the early Ming Dynasty. This book is widely compiled from previous medical books and other related works. There are only remnants of the original book, which was adapted into 426 volumes when compiling Sikuquanshu in the early Qing Dynasty.