Efficacy ˈefɪkəsi Ability Noun Medical Ef·Fi·Cacy Formal Produce
Efficacy refers to the ability of something, particularly a drug or medical treatment, to produce the desired results. It is also considered formal language.
[N-UNCOUNT 不可数名词]功效；效力 If you talk about the efficacy of something, you are talking about its effectiveness and its ability to do what it is supposed to.
[usu with poss]
[FORMAL 正式]
Recent medical studies confirm the efficacy of a healthier lifestyle.
最新医学研究证实了较为健康的生活方式的好处。
Oxford
ef·fi·cacy/ˈefɪkəsi; NAmEˈefɪkəsi/noun[uncountable ]( formal) the ability of sth, especially a drug or a medical treatment, to produce the results that are wanted （尤指药物或治疗方法的）功效，效验，效力SYN