The proven performance of a product established under defined conditions extract; an article with liquid, solid, or semisolid consistency in which the constituents of interest are completely or partially separated from other components with the aid of water, alcohol, alcohol-water mixtures, or other suitable solvents.
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Efficacy is the ability to perform a task to a satisfactory or expected degree. The word comes from the same roots as effectiveness, and it has often been used synonymously, although in pharmacology a distinction is now often made between efficacy and effectiveness.
The word efficacy is used in pharmacology and medicine to refer both to the maximum response achievable from a pharmaceutical drug in research settings, and to the capacity for sufficient therapeutic effect or beneficial change in clinical settings.
English
Etymology
From Old French efficace, from Late Latin efficācia (“efficacy”), from efficāx (“efficacious”); see efficacious.
Pronunciation
- (Received Pronunciation, General American, Canada) IPA(key): /ˈɛf.ɪ.kə.si/
- (General Australian) IPA(key): /ˈef.ɪ.kə.si/, [ˈef.ɪ.kə.sɪi]
Noun
efficacy (usually uncountable, plural efficacies)
- The ability to produce
