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Definitions from the Web

Efficacy

Part of speech: noun

Sense: the power to produce a desired result; effectiveness

Usage: The term efficacy refers to the ability of something to achieve the intended effect or produce the desired outcome.

Examples:

• The efficacy of this medication in treating the common cold is still under investigation.
• Scientific studies have shown the efficacy of exercise in improving mental health.
• When choosing a sunscreen, it is essential to consider its SPF and efficacy in protecting against harmful UV rays.

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• Books about efficacy
• Supplements for efficacy
• Skincare products for efficacy