Abstract: Deriyaka was the Manchu phonetic rendering for the Western medicine Theriac． From time to time，
all medical books in China have considered it a panacea which could cure all kinds of diseases．
However，the term Theriac cannot be found in any official or private medical books from the early Qing
dynasty． It was not until the Kangxi period that the term Theriac returned，with another phonetic
transliteration，deriyaka in official books． The medical records of the Qing court of the Kangxi period no
longer considered deriyaka a panacea，and there were several cases in which deriyaka was replaced with
other medicines because it failed to cure a disease． This research focuses on the rise and decline of
deriyaka in the early Qing relying on the Manchu-language book Si Yang ni Okto i Bithe and other official
books． The author discusses the origin of deriyaka，its introduction into the court，and its application in
the Qing court． The articles contributes to the research on the transmission of medicine between China
and abroad，the tendency of combining the usage of Chinese and Western medicine within the Qing
court，and the role of the ruler in the process of using Western medicine．