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Discover LudwigThe phrase "the efficacy" is correct and usable in written English.
It is typically used to refer to the effectiveness or ability of something to produce a desired result, often in scientific or medical contexts. Example: "Researchers are studying the efficacy of the new drug in treating the disease."
Dictionary
the efficacy
noun
Ability to produce a desired effect under ideal testing conditions.
synonyms
Exact(60)
The efficacy of these laws is doubtful.
Some doubt the efficacy of online learning.
The Efficacy of LSD in the Treatment of Alcoholism.
And opinion remains divided on the efficacy of divestment.
"The efficacy of my tree stimulators is nebulous".
There's a second problem with the "efficacy" requirement.
Some experts remain skeptical about the efficacy of education alone.
However, there too the efficacy of policy is highly questionable.
It is because he believes in the efficacy of images.
No one really believes in the efficacy of professional sports.
Doctors continue to debate the efficacy of Ritalin.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com