Similar prescriptions containing opium had been quite popular in india and west asia before the sui and tang dynasties , and they were probably introduced into china before theriaca did , of which the ophalmology of india might serve as a medium 底也迦只是含有鸦片的合方，含有鸦片的类似合方在隋唐以前流行于印度和西亚，似有在底也迦之前传入中国之可能，其中印度的眼科医术或许起了媒介作用。
