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Example Sentences

Initial trials should also be evaluated by an International Scientific Advisory Panel—yet to be established—for safety and efficacy before receiving the final go-ahead.

These trials allow scientists to determine the vaccines’ efficacy and identify side effects that may not have appeared in phase 1 or phase 2 trials.

From Vox

We need to assess safety, and we won’t know the efficacy part until much later.

Meanwhile, other experts have questioned the efficacy of Hong Kong’s mass testing as a preventative measure since people are still free to circulate around the city.

From Fortune

Just last week, FDA commissioner Stephen Hahn cited misleading statistics about the efficacy of using blood plasma to treat severe Covid-19.

From Vox

The eating disorder field remains divided over the potential efficacy of such measures.

On average, the vaccine has an efficacy of about 60 percent.

The efficacy of bandying threats of going to hell met its match in the Civil War.

If there were a pill with such poor efficacy, it might be considered malpractice to prescribe it.

Most Pennsylvanians now support a moratorium on capital punishment until its efficacy can be determined.

The cow happily recovered, which the widow entirely attributed to the efficacy of her pastor's prayer.

It is, therefore, with pleasure I make known the following recipe, which I am assured has been tried with efficacy.

Who can understand its nature, its operations, the sufficiency which is not sufficient, and the efficacy which is ineffectual.

The natural reverence for their remains soon passed into a superstitious veneration and belief in their miraculous efficacy.

As such, the efficacy of prayer in their regard must be judged according to the principles applying to the latter.


On this page you'll find 60 synonyms, antonyms, and words related to efficacy, such as: adequacy, competence, effectiveness, potency, virtue, and ability.

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.