What is Efficacy?

Efficacy definition and meaning on Health terms:
Efficacy refers to the ability of a medicine to provide a beneficial effect (a positive benefit/risk ratio) when studied in a clinical trial. When talking in terms of efficacy vs. effectiveness, effectiveness relates to how well a treatment works in the real world practice of medicine, as opposed to efficacy, which measures how well a treatment works in clinical trials or laboratory studies.


reference: https://www.eupati.eu/glossary/