Thesaurus.com
Dictionary.com
Showing results for efficacy. Search instead for Drug+Efficacy.
Definitions

efficacy

[ef-i-kuh-see] / ˈɛf ɪ kə si /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"This lets us speak about safety and efficacy with real confidence," he said.

From Science Daily • Jun. 17, 2026

The analysts at Citi also highlighted what they said were real-world signals of waning efficacy in Wegovy pill as roughly a quarter to a third of patients are no longer losing weight.

From MarketWatch • Jun. 8, 2026

They add: "Assessing long-term efficacy is critical since those who work night shifts for many years would need to consistently consume melatonin supplements over that time frame to maximize the potential cancer prevention benefits."

From Science Daily • May 30, 2026

Early data from China showed “robust efficacy signals,” Dai noted.

From Barron's • May 27, 2026

But there’ll always be some people who will do extremely well, and they will loudly swear to the efficacy of whatever system they’ve used.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos




Vocabulary lists containing efficacy


Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember "efficacy" for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com