Concerned about the possibility of Koiho being taken over by Chinese medicine, Emperor Heizei made a request to shrines, powerful local ruling families and old families in each province to submit their own Koiho that had been passed down through generations.
漢方医学の流入で崩壊の危機に瀕している事態を憂慮した平城天皇は、諸国の国造以下の有力な豪族・旧家や神社に対して伝承する古医方を提出させた。