Efficacy Meaning in English
word
Definition
Efficacy is the ability of something, such as a medicine or a method, to produce the intended or desired result.
Usage & Nuances
Used mostly in formal or academic contexts, especially in science, medicine, and research ('the efficacy of a vaccine'). It is not used for people—instead, use 'effectiveness' for broader or everyday meaning. 'Efficacy' refers to proven results under ideal or controlled conditions.
Example Sentences
The efficacy of the new drug was tested in the laboratory.
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There is still debate about the efficacy of this method.
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We're waiting for more data to confirm the efficacy of the treatment.
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Scientists study the efficacy of vaccines before using them widely.
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Herbal remedies often lack clear evidence of efficacy.
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If the efficacy isn't proven, insurance companies won't cover the cost.
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