Efficacy is the capacity for beneficial change (or therapeutic effect) of a given intervention, most commonly used in the practice of medicine and pharmacology.
== Medicine ==
In medicine, efficacy is the capacity for beneficial change (or therapeutic effect) of a given intervention (for example a drug, medical device, surgical procedure, or a public health intervention). If efficacy is established, an intervention is likely to be at least as good as other available interventions, to which it will have been compared. Comparisons of this type are typically made in 'explanatory' randomized controlled trials, whereas 'pragmatic' trials are used to establish the effectiveness of an intervention.
When talking in terms of efficacy vs. effectiveness, effectiveness relates to how well a treatment works in the practice of medicine, as opposed to efficacy, which measures how well treatment works in clinical trials or laboratory studies.〔(How FDA Approves Drugs ) see textbox pg 4. There is some confusion caused by the fact that the FDA has a mandate to insure that drugs are "safe and effective," but in reality the FDA will approve drugs that have been proven to have clinical ''efficacy'', without any of the required proof of "clinical effectiveness" by this definition.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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