What was the first complete pharmacological work?

China's first complete pharmaceutical work is Shennong Herbal Classic, also known as Herbal Classic or Benjing, which was written in the Han Dynasty and is the earliest known pharmaceutical work in China. Its author is not a person, nor is it written by people of any dynasty, but written by many doctors and collected in the name of "Shennong". Most of the drugs recorded in Shennong Materia Medica Classic are true and reliable, and some of them are still in use today. It is not only the crystallization of the wisdom of the ancient working people in China, but also a phased summary of ancient medicine in China.