Efficacy
Efficacy noun - The power to produce a desired result.
Usage example: questioned the efficacy of the alarms in actually preventing auto theft
Potency is a synonym for efficacy in effectiveness topic. In some cases you can use "Potency" instead a noun "Efficacy", when it comes to topics like efficiency, affect, cost-effectiveness. popular alternative
Potency
Potency noun - The ability to exert effort for the accomplishment of a task.
Efficacy is a synonym for potency in effectiveness topic. You can use "Efficacy" instead a noun "Potency", if it concerns topics such as power, affect, effect, cost-effectiveness. popular alternative
Mutual synonyms
How words are described
Both words in one sentence
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Any variation of, "Nothing is stronger." Drugs measure their effectiveness with two different measurements; efficacy and potency.
Source: Polish The Turd
Cite this Source
Potency and Efficacy. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/efficacy/potency
Efficacy & Potency. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/efficacy/potency>.
Potency or Efficacy. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/efficacy/potency.
Google Ngram Viewer shows how "efficacy" and "potency" have occurred on timeline